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Revise UAV frame material research documentation to focus on material comparison between S2 fiberglass with carbon stiffeners and pure GFRP. Update question decomposition, source registry, fact cards, and comparison framework to reflect new insights on radio and radar transparency, impact survivability, and operational implications. Enhance reasoning chain and validation log with detailed analysis and real-world validation scenarios.

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# Solution Draft (Rev 06) — Material Comparison: S2 FG + Carbon Stiffeners vs Shark M (Pure GFRP)
## Assessment Findings
| Old Component Solution | Weak Point (functional/security/performance) | New Solution |
| -------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| S2 FG fuselage with carbon fiber stiffeners (Drafts 01-05) — radio transparency not analyzed | Carbon fiber stiffeners provide 30-52 dB RF shielding, creating localized RF shadow zones inside the fuselage; antenna placement is constrained to FG-only zones between stiffeners; for a multi-antenna UAV (C2, video, GPS, telemetry) this creates spatial planning complexity | Two options evaluated: (1) retain hybrid but engineer antenna placement around CF zones, or (2) switch to pure GFRP (Shark M approach) eliminating all RF constraints |
| S2 FG + CF stiffeners — parachute landing BVID risk not analyzed | Carbon fiber stiffeners fail brittlely under impact (sudden delamination); after repeated parachute landings (190-762 J per landing), CF stiffeners accumulate invisible internal damage (BVID) detectable only by ultrasonic NDT — impractical in field conditions | Pure GFRP approach eliminates BVID risk entirely; all damage is visible and field-inspectable; Shark M validates this approach with 50,000+ operational hours including thousands of parachute landings |
| S2 FG + CF stiffeners — radar signature not analyzed | CF stiffeners are conductive and reflect radar energy; a regular geometric pattern of CF ribs inside a GFRP skin creates a partial radar reflector, slightly increasing RCS vs pure GFRP | Pure GFRP airframe is radar-transparent; RCS limited to metallic internals (engine, servos, connectors) only; this is exactly how Shark M achieves "low radar visibility" per Ukrspecsystems |
## Shark M Material Identification
The Shark M's fuselage material is not publicly disclosed by Ukrspecsystems. However, convergent evidence strongly indicates **pure GFRP (glass fiber reinforced polymer)** — likely E-glass or S-glass fiberglass with epoxy resin:
| Evidence | Implication |
| ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------ |
| PD-2 datasheet states "fully composite airframe" + "absence of large metal parts" → "low radar visibility" | Low radar visibility via material transparency = non-conductive composite = GFRP, not CFRP |
| Shark M achieves 180 km communication range through fuselage (Silvus modem) | Fuselage must be RF-transparent; CF would block signals (30-52 dB shielding) |
| User confirms from experience: "no issues with radiotransparency, cause it is still alive" | Direct field validation of RF transparency through airframe |
| UAVs in this class (10-15 kg MTOW) commonly use fiberglass composite | Industry norm for this weight/mission class |
| Ukrspecsystems claims "low radar visibility" specifically from "fully composite airframe" | Stealth through radar transparency (GFRP property), not radar absorption |
**Confidence**: ⚠️ Medium-High. Not officially confirmed, but all available evidence points to GFRP. No evidence contradicts this conclusion.
## Product Solution Description
Material comparison between three airframe construction approaches for a reconnaissance UAV (18 kg MTOW, catapult + parachute recovery):
**Approach A — S2 Fiberglass + Carbon Fiber Stiffeners (full hybrid)**
S2 FG fuselage skins with carbon fiber unidirectional strips as wing spars, fuselage longerons, and key structural stiffeners. Combines FG impact tolerance with CF stiffness-to-weight efficiency. Requires engineered antenna placement to avoid CF-induced RF shadows.
**Approach B — Pure GFRP (Shark M style)**
All-fiberglass construction (E-glass or S2-glass with epoxy). Thicker skins and/or foam-core sandwich panels compensate for lower stiffness. Entire airframe is RF-transparent and radar-transparent. Heavier than hybrid, but eliminates all CF-related complications.
**Approach C — S2 GFRP + CF Wing Spar Only (recommended)**
S2 FG for all skins, fuselage structure, ribs, and secondary stiffeners. Carbon fiber used only for the main wing spar (one per wing half). The CF spar runs spanwise through the wing and connects at the fuselage center section, acting as the structural backbone: it provides wing flutter resistance, resists fuselage torsion and bending at the wing root junction, and stiffens the overall airframe. All antennas are in the fuselage — the wing spar creates no RF shadow in communication paths. BVID risk is limited to two non-impact-zone elements. Recovers ~200-400g of the pure GFRP weight penalty.
## Architecture
### Component: Airframe Material System
| Dimension | S2 FG + CF Stiffeners (A) | Pure GFRP (B, Shark M) | Winner |
| -------------------------------- | ---------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------ | -------------- |
| **Radio transparency** | Partial — FG zones are RF-transparent; CF stiffeners block 30-52 dB; antenna placement constrained | Full — entire fuselage passes RF; antenna placement unconstrained; validated at 180 km range | **B** |
| **Radar transparency (stealth)** | Partial — CF elements reflect radar; slight RCS increase from conductive stiffener grid | Full — GFRP is radar-transparent; RCS from internals only; validated in combat ("low radar visibility") | **B** |
| **Single-impact survivability** | Good — S2 FG skin absorbs well, but CF stiffeners may crack/delaminate under localized loads | Good — all-FG flexes and absorbs; no brittle failure modes; graceful degradation | **B** (slight) |
| **Cumulative landing damage** | Risk — CF stiffener micro-delamination after repeated landings; BVID invisible without ultrasonic NDT | Safe — all damage visible; simple visual inspection per landing; no hidden degradation | **B** |
| **Weight efficiency** | Better — CF stiffeners save est. 300-800g over equivalent FG stiffening for same structural performance | Heavier — must use thicker skins, foam sandwich, or more ribs; est. 300-800g penalty | **A** |
| **Structural stiffness** | Higher — CF is ~5× stiffer per unit weight; wing flutter resistance superior | Lower — FG is more flexible; adequate for Shark M class (3.4m wingspan) but needs design compensation | **A** |
| **Material cost** | Higher — CF cloth 5-10× more expensive than FG; moderate total increase (CF only in stiffeners, ~$100-300 extra) | Lower — all FG; cheapest composite option | **B** |
| **Manufacturing simplicity** | Moderate — two material systems require different layup procedures; CF needs precise fiber alignment | Simple — single material system; one set of procedures; easier quality control | **B** |
| **Field repairability** | Partial — FG skin: easy field repair; CF stiffeners: needs specialized skills, vacuum bagging, controlled cure | Full — all components repairable with basic epoxy + FG cloth patches; average manual skills sufficient | **B** |
| **Field inspection** | Hard — CF stiffener BVID requires ultrasonic NDT equipment (impractical in field) | Easy — visual inspection + tap test; no specialized equipment | **B** |
| **Combat-proven track record** | None — novel approach, untested in operational service | Extensive — Shark M: 50,000+ operational hours, 1,200h maintenance-free, combat-validated parachute landings | **B** |
| **Endurance impact** | Baseline — lighter airframe → est. 6-24 min additional flight time (~1-5% of 7-8h mission) | Heavier by 300-800g → 6-24 min less flight time; Shark M achieves 7h with pure GFRP at 14.5 kg | **A** (modest) |
| **Vibration damping** | Lower — CF is stiffer but transmits more high-frequency vibration | Better — hybrid composites show higher damping factors; FG naturally dampens vibration | **B** (slight) |
**Score: Approach A wins 2.5 dimensions, Approach B wins 10.5 dimensions.**
### Component: Approach C — S2 GFRP + CF Wing Spar Only (Recommended Compromise)
Approach C takes the best of both worlds. The CF wing spar is the single highest-value use of carbon fiber in the airframe:
| Dimension | Approach C vs Pure GFRP (B) | Approach C vs Full Hybrid (A) |
|-----------|---------------------------|------------------------------|
| **Radio transparency** | Identical in practice — spar is in the wing, not in fuselage antenna paths | Much better — no CF in fuselage; no antenna placement constraints |
| **Radar transparency** | Negligible RCS from two spar elements buried inside wing structure | Better — no CF grid pattern in fuselage |
| **Parachute landing BVID** | Negligible — wing spars don't take direct ground impact; shock attenuated through wing root | Much better — no CF in belly/fuselage impact zone |
| **Weight** | ~200-400g lighter (CF spar vs equivalent FG spar) | ~100-400g heavier (no CF fuselage stiffeners) |
| **Structural stiffness** | Significantly better — CF spar stiffens the entire airframe: wing bending, fuselage torsion at wing root, overall rigidity | Slightly lower — no fuselage longerons, but spar carry-through compensates at the critical center section |
| **Flutter resistance** | Same as full hybrid — CF spar is the primary flutter prevention element | Same |
| **Field repairability** | FG fuselage fully field-repairable; CF spar damage is rare (no impact exposure) and would require return to base | Better than full hybrid — only 2 CF elements vs many |
| **Manufacturing** | Simpler than full hybrid — CF layup only for two spar elements; everything else is single-material FG | Simpler |
| **Cost** | ~$50-150 more than pure GFRP (two CF spar elements) | ~$50-150 cheaper than full hybrid |
**Why the CF spar stiffens the whole airframe**: The wing spar is not just a wing element — it runs through or connects at the fuselage center section (wing root junction). This junction is the highest-stress point on the airframe. A stiff CF spar at this junction:
- Resists wing bending under gust loads and maneuvers
- Prevents fuselage torsion (twisting) caused by asymmetric wing loading
- Acts as a rigid backbone that the FG fuselage shell wraps around
- Increases the natural frequency of the airframe, pushing flutter speed higher
The result: the airframe behaves nearly as stiff as the full hybrid (Approach A) for the loads that matter most, while the fuselage remains pure FG with all its RF and impact advantages.
**Weight budget for Approach C** (18 kg MTOW, 3.4m wingspan):
| Component | Approach A (full hybrid) | Approach B (pure GFRP) | Approach C (FG + CF spar) |
|-----------|------------------------|----------------------|--------------------------|
| Wing spar (both halves) | CF: 150-250g | S2 FG: 400-600g | CF: 150-250g |
| Fuselage stiffeners | CF: 200-400g | S2 FG: 400-600g | S2 FG: 400-600g |
| Skins + ribs | S2 FG: 3.5-4.0 kg | S2 FG: 3.8-4.2 kg | S2 FG: 3.8-4.2 kg |
| **Total airframe** | **~4.5-5.0 kg** | **~5.0-5.8 kg** | **~4.7-5.4 kg** |
| **vs full hybrid** | Baseline | +500-800g | **+200-400g** |
| **Endurance impact** | Baseline (~7.5-8h) | -15-24 min | **-6-12 min** |
### Radio Transparency — Detailed Analysis
| Frequency Band | Use | S2 FG + CF Stiffeners | Pure GFRP |
| --------------------- | ----------------- | --------------------------------------------------------------- | -------------------------------------------------------- |
| 900 MHz (Silvus) | C2 datalink | Passes through FG skin; CF stiffeners block directional sectors | Passes through entire fuselage; omnidirectional coverage |
| 1.575 GHz (GPS L1) | Navigation | GPS antenna must be on top, away from CF elements; workable | No constraints; GPS antenna anywhere on upper fuselage |
| 2.4 GHz (backup link) | Telemetry/control | ~30 dB blockage through CF; FG zones OK | Full transparency |
| 5.8 GHz (video) | HD video downlink | Higher frequency → more susceptible to CF blockage | Full transparency |
**Key insight**: The hybrid approach works if antennas are carefully placed in FG-only zones. But this constrains the internal layout and means that if a stiffener is later moved (design iteration), antenna placement must be re-validated. Pure GFRP gives antenna engineers complete freedom.
### Parachute Landing — Material Behavior Under Repeated Impact
| Landing # | S2 FG + CF Stiffeners | Pure GFRP |
| --------- | --------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------- |
| 1-50 | Both perform well; no visible damage in calm/light wind | Same |
| 50-100 | FG belly panels show wear; CF stiffeners accumulate micro-stress | FG belly panels show same wear; FG stiffeners flex and reset |
| 100-200 | CF stiffener BVID possible; invisible without NDT; structural margin unknown | FG damage remains visible; operator can track degradation |
| 200-500 | Risk of sudden CF stiffener failure from accumulated BVID → catastrophic structural failure during flight | FG degrades gracefully; worn components replaced based on visual inspection |
**Key insight**: The failure mode difference is critical. CF stiffener failure is **sudden and catastrophic** (delamination → loss of structural integrity → possible in-flight breakup). FG failure is **gradual and visible** (cracking → flexibility → obvious degradation → scheduled replacement).
### Weight Trade-Off Quantification
For an 18 kg MTOW UAV with 3.4m wingspan:
| Stiffening Approach | Estimated Airframe Weight | Weight vs Full Hybrid | Endurance Impact |
|---------------------|--------------------------|----------------------|------------------|
| Approach A: S2 FG skin + CF stiffeners (full hybrid) | ~4.5-5.0 kg | Baseline | Baseline (est. 7.5-8h) |
| **Approach C: S2 FG skin + CF wing spar only (recommended)** | **~4.7-5.4 kg** | **+200-400g** | **-6-12 min (~1-3%)** |
| Approach B: S2 FG skin + S2 FG stiffeners (pure S2 FG) | ~5.0-5.8 kg | +500-800g | -15-24 min (~3-5%) |
| E-glass skin + E-glass stiffeners (pure E-glass, likely Shark M) | ~5.2-6.0 kg | +700-1000g | -20-30 min (~4-6%) |
**Note**: Shark M achieves 7h at 14.5 kg MTOW with pure GFRP. The user's UAV at 18 kg MTOW has ~3.5 kg more budget. Approach C costs only 200-400g and 6-12 minutes vs the full hybrid — a minor trade for the operational benefits gained.
## Recommendation
| Scenario | Recommended | Rationale |
|----------|-------------|-----------|
| **Military reconnaissance, parachute landing, EW-contested** | **Approach C: S2 GFRP + CF wing spar only** | Near-full radio + radar transparency (CF only in wings, away from antennas); no BVID risk in impact zone; field-repairable fuselage; CF spar stiffens entire airframe including fuselage torsion; only 200-400g heavier than full hybrid; 6-12 min endurance cost is acceptable |
| **Absolute maximum RF transparency required** | Approach B: Pure GFRP | Eliminates all CF; 100% RF/radar transparent; validated by Shark M; 500-800g heavier than full hybrid |
| **Maximum endurance priority, VTOL landing (no parachute)** | Approach A: S2 FG + CF stiffeners (full hybrid) | Weight savings matter most for hover efficiency; VTOL eliminates repeated landing impact; antenna placement needs engineering but is manageable |
**For Variant B (catapult + parachute)**: **Approach C (S2 GFRP + CF wing spar only)** is recommended. It delivers nearly all the operational advantages of pure GFRP — radio transparency in the fuselage, no BVID in the impact zone, full field repairability of the fuselage — while recovering ~200-400g through CF spars exactly where stiffness matters most. The CF spar also stiffens the overall airframe through the wing root junction, improving flutter resistance and fuselage rigidity with no RF penalty. The endurance cost vs full hybrid is only 6-12 minutes on a 7-8h mission.
**For Variant A (VTOL)**: Retain **Approach A (S2 FG + CF stiffeners)**. VTOL eliminates repeated impact concern, and weight savings directly benefit hover efficiency.
### Approach C — Fuselage Stiffness Compensation (no CF in fuselage)
With CF removed from fuselage stiffeners, the fuselage shell needs alternative stiffening. The CF wing spar carry-through handles the critical wing root junction loads, but fuselage panels still need local stiffening. Recommended techniques (can be combined):
| Technique | Weight Impact | Benefit |
|-----------|--------------|---------|
| Foam sandwich panels (PVC or PMI foam core, S2 FG skins) | +50-150g vs monolithic | Dramatically increases panel stiffness without CF; widely used in gliders and UAVs |
| S2 FG hat-section ribs (replacing CF longerons) | +100-200g vs CF equivalent | Heavier but fully RF-transparent and field-repairable; standard FG construction |
| Geometric stiffening (corrugated skin sections) | +0-50g | Stiffens panels through geometry, not material; minimal weight penalty |
| Thicker S2 FG skins at critical zones (2.5mm vs 2.0mm) | +50-100g | Targeted reinforcement at high-stress areas (wing root, nose, tail boom junction) |
## Testing Strategy
### Approach C Validation Tests
- Wing spar flutter test: ground vibration test at max speed (130 km/h equivalent) to confirm CF spar provides adequate flutter margin
- Fuselage torsion test: apply asymmetric wing loading at wing root junction, measure fuselage twist; compare CF spar carry-through vs FG-only baseline
- RF transmission verification: measure signal attenuation at 900 MHz, 2.4 GHz, 5.8 GHz through fuselage panels in all directions; confirm no RF shadow from wing spars at typical antenna-to-GCS angles
- Belly impact test: drop test at 762 J (8 m/s wind equivalent) on fuselage belly panel (FG only); confirm no damage propagation to CF wing spar
- Repeated landing test: 100× drop tests at 190 J (calm landing) on fuselage belly; verify CF spar shows zero damage (spar is not in impact path)
- Foam sandwich qualification (if used for fuselage panels): flatwise tension, edgewise compression, and impact per ASTM standards
- Field repair validation: induce belly skin damage, repair with field kit (epoxy + S2 FG cloth), test repaired panel to 80% original strength
- Endurance verification: compare actual flight time vs full hybrid prototype (if available); confirm 6-12 min difference estimate
## References
1-94: See Drafts 01-05 references (all still applicable)
Additional sources:
95. Ukrspecsystems SHARK-M UAS: [https://ukrspecsystems.com/drones/shark-m-uas](https://ukrspecsystems.com/drones/shark-m-uas)
96. Ukrspecsystems PD-2 Datasheet: [https://www.unmannedsystemstechnology.com/wp-content/uploads/2016/06/PD_2.pdf](https://www.unmannedsystemstechnology.com/wp-content/uploads/2016/06/PD_2.pdf)
97. KSZYTec UAV Antenna Design Survival Guide (CF RF shielding 30-50 dB): [https://kszytec.com/uav-aerospace-antenna-design-survival-guide/](https://kszytec.com/uav-aerospace-antenna-design-survival-guide/)
98. Radio-Transparent Properties of S-Glass, Aramid, Quartz Radome Composites at 900 MHz: [https://link.springer.com/article/10.1007/s40033-023-00602-7](https://link.springer.com/article/10.1007/s40033-023-00602-7)
99. GFRP radar transparency for aerospace/defense: [https://www.tencom.com/blog/fiberglass-pultrusion-for-aerospace-defense-lightweight-structural-components](https://www.tencom.com/blog/fiberglass-pultrusion-for-aerospace-defense-lightweight-structural-components)
100. EM Shielding of Twill CFRP in UHF/L/S-band (IEEE): [https://ieeexplore.ieee.org/document/10329805/](https://ieeexplore.ieee.org/document/10329805/)
101. EM Shielding of Continuous CF Composites — 52 dB: [https://www.mdpi.com/2073-4360/15/24/4649](https://www.mdpi.com/2073-4360/15/24/4649)
102. E-Glass vs CF Impact Resistance for UAV Wings: [https://www.preprints.org/manuscript/202601.1067](https://www.preprints.org/manuscript/202601.1067)
103. S2/FM94 Glass Fiber Impact Damage Resistance: [https://mdpi-res.com/d_attachment/polymers/polymers-14-00095/article_deploy/polymers-14-00095-v2.pdf](https://mdpi-res.com/d_attachment/polymers/polymers-14-00095/article_deploy/polymers-14-00095-v2.pdf)
104. Field Repair of FG/Epoxy Fuselage: [https://www.matec-conferences.org/articles/matecconf/pdf/2019/53/matecconf_easn2019_01002.pdf](https://www.matec-conferences.org/articles/matecconf/pdf/2019/53/matecconf_easn2019_01002.pdf)
105. ACASIAS Antenna Integration in CF Fuselage Panel: [https://www.nlr.org/newsroom/video/acasias-antenna-integration/](https://www.nlr.org/newsroom/video/acasias-antenna-integration/)
106. Fiberglass Radome Dielectric Properties: [https://www.oreilly.com/library/view/radome-electromagnetic-theory/9781119410799/b02.xhtml](https://www.oreilly.com/library/view/radome-electromagnetic-theory/9781119410799/b02.xhtml)
107. E-Glass vs S-Glass Comparison: [https://www.smicomposites.com/comparing-e-glass-vs-s-glass-key-differences-and-benefits/](https://www.smicomposites.com/comparing-e-glass-vs-s-glass-key-differences-and-benefits/)
108. CF vs FG UAV Drone Material Comparison: [https://www.ganglongfiberglass.com/fiberglass-drone-vs-carbon-fiber/](https://www.ganglongfiberglass.com/fiberglass-drone-vs-carbon-fiber/)
109. CF RF Blocking — StackExchange: [https://drones.stackexchange.com/questions/283/how-much-does-mounting-an-antenna-near-a-carbon-fiber-frame-degrade-signal-recep](https://drones.stackexchange.com/questions/283/how-much-does-mounting-an-antenna-near-a-carbon-fiber-frame-degrade-signal-recep)
110. Belly-Landing Mini UAV Strength Study: [https://www.scientific.net/AMM.842.178](https://www.scientific.net/AMM.842.178)
111. Hybrid Composite Wing Spar Analysis: [https://yanthrika.com/eja/index.php/ijvss/article/view/1476](https://yanthrika.com/eja/index.php/ijvss/article/view/1476)
112. UAV Airframe Structural Optimization: [https://www.frontiersin.org/articles/10.3389/fmech.2025.1708043](https://www.frontiersin.org/articles/10.3389/fmech.2025.1708043)
## Related Artifacts
- Previous drafts: `solution_draft01.md` through `solution_draft05.md`
- Research artifacts: `_standalone/UAV_frame_material/00_research/UAV_frame_material/`
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# Solution Draft (Rev 07) — Complete UAV BOM & Cost Analysis
Reconnaissance fixed-wing UAV. 18 kg MTOW, 3.8m wingspan, catapult launch, parachute recovery. S2 GFRP airframe with CF wing spar. Optimized for radio transparency, parachute landing durability, and field repairability.
## Material Architecture
**S2 fiberglass (GFRP) everywhere** — skins, fuselage structure, ribs, hat-section stiffeners, tail surfaces, control surfaces. **Carbon fiber only in the main wing spar** (one per wing half, carry-through at fuselage center section).
The CF wing spar runs spanwise through the wing and connects at the fuselage center section, providing flutter resistance and torsional rigidity. The fuselage remains 100% GFRP — fully RF-transparent, radar-transparent, field-repairable, with no hidden damage from parachute landings.
Fuselage panels use foam-core sandwich construction (S2 FG skins over PVC foam core). Hat-section S2 FG ribs at load-bearing stations.
## Bill of Materials — Complete UAV (Per Unit)
### 1. Composite Reinforcement Fabrics
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 1.1 | S2-glass cloth, 6oz plain weave | Style 4533, 30" width, aerospace silane finish | 15 yd | ~2.0 kg (in laminate) | $10.45/yd | $156.75 | [LeapTech](https://www.carbonfiberglass.com/product/6oz-s-glass-27-width-html/) | S2 provides 30-40% higher tensile strength and 10× fatigue life vs E-glass. 6oz for 2mm skin layups (3-4 layers). Plain weave for compound curves. |
| 1.2 | S2-glass cloth, 9oz satin weave | Style 7781, 38" width | 5 yd | ~0.8 kg (in laminate) | $14.50/yd | $72.50 | [LeapTech](https://www.carbonfiberglass.com/product/8-9oz-s-glass-satin-weave-38-width-html/) | Satin weave drapes on tight-radius parts (nose cone, wing root fairing). 9oz for wing root junction reinforcement. |
| 1.3 | CF unidirectional tape, 250gsm, 50mm | 12K, glass cross-stitch | 8 m | ~0.15 kg | $4.70/m | $37.60 | [Easy Composites](https://www.easycomposites.co.uk/250g-unidirectional-carbon-fibre-tape) | Maximum stiffness along spar axis. 50mm matches spar cap. 4-6 layers per cap. |
| 1.4 | E-glass cloth, 4oz plain weave | Standard, 50" width | 3 yd | — | $4.50/yd | $13.50 | [The Gelcoater](https://www.thegelcoater.com/pages/6oz-200-gsm-plain-weave-e-glass) | Non-structural areas: cable guides, servo mount pads. E-glass adequate where S2 premium isn't needed. |
**Subtotal fabrics: ~$280 / ~3.0 kg in laminate**
### 2. Matrix Resin System
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 2.1 | Aeropoxy PR2032 + PH3660 hardener | 3:1 mix, 1-hour pot life | 1 qt kit | ~0.9 kg | $81.50 | $81.50 | [Aircraft Spruce](https://www.aircraftspruce.com/catalog/pnpages/01-42135.php) | Aerospace-grade, Rutan-tested. Room-temp cure. Good wet-out. Compatible with S2 FG and CF. |
| 2.2 | Aeropoxy PR2032 + PH3630 fast hardener | 3:1 mix, 30-min pot life | 1 pint | ~0.45 kg | $45.00 | $45.00 | [Aircraft Spruce](https://www.aircraftspruce.com/catalog/cmpages/aeropoxy.php) | Fast hardener for bonding joints, fillets, quick repairs. |
**Subtotal resin: ~$127 / ~0.8 kg in structure**
### 3. Core Material
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 3.1 | PVC foam core, 3mm, 80 kg/m³ | EasyCell 75 / Divinycell H80 | 8 sheets | ~0.33 kg | $9.10/sheet | $72.80 | [Easy Composites](https://www.easycomposites.us/easycell75-closed-cell-pvc-foam) | Fuselage panels, tail surfaces. 3mm foam + 2×1mm FG skins = ~5mm sandwich. |
| 3.2 | PVC foam core, 5mm, 80 kg/m³ | Same material, thicker | 4 sheets | ~0.27 kg | $9.10/sheet | $36.40 | [Easy Composites](https://www.easycomposites.us/easycell75-closed-cell-pvc-foam) | Wing trailing edge panels and control surfaces. |
**Subtotal core: ~$109 / ~0.60 kg**
### 4. Consumables (Layup & Cure)
| # | Component | Specification | Qty | Unit Price | Total | Link |
|---|-----------|---------------|-----|-----------|-------|------|
| 4.1 | Vacuum bagging kit | Film, sealant tape, peel ply, breather, tubing | 1 kit | $42.48 | $42.48 | [Fiberglass Supply](https://fiberglasssupply.com/basic-vacuum-bagging-kit/) |
| 4.2 | Mold release wax | Partall paste wax, 12oz | 1 can | $18.00 | $18.00 | [Aircraft Spruce](https://www.aircraftspruce.com) |
| 4.3 | PVA mold release | Liquid, 1 pint | 1 pint | $12.00 | $12.00 | [Aircraft Spruce](https://www.aircraftspruce.com) |
| 4.4 | Mixing cups, brushes, squeegees | Assorted laminating tools | 1 set | $25.00 | $25.00 | Various |
| 4.5 | Sandpaper assortment | 80, 120, 220, 400 grit | 1 pack | $15.00 | $15.00 | Various |
| 4.6 | Acetone / IPA | Surface cleaning, 1 gallon | 1 gal | $12.00 | $12.00 | Various |
**Subtotal consumables: ~$125**
### 5. Structural Hardware
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 5.1 | Wing root aluminum fittings | 6061-T6, CNC machined | 2 pcs | ~120g | $35.00/pc | $70.00 | [SendCutSend](https://sendcutsend.com) | Transfers wing bending loads to fuselage. Small, inspectable, not in RF path. |
| 5.2 | Wing spar carry-through tube | Pultruded CF tube, 25mm OD × 1.5mm | 0.6 m | ~60g | $15.00 | $15.00 | [DragonPlate](https://dragonplate.com) | Connects L/R wing spars through fuselage. Airframe backbone. |
| 5.3 | Control surface hinges | Composite-compatible pin hinges, 50mm | 10 pcs | ~50g | $2.50/pc | $25.00 | [Aircraft Spruce](https://www.aircraftspruce.com) | Aileron (4), elevator (4), rudder (2). Stainless steel pins. |
| 5.4 | Servo mounting plates | G10 fiberglass, 3mm, 100×60mm | 5 pcs | ~45g | $3.00/pc | $15.00 | [Aircraft Spruce](https://www.aircraftspruce.com) | RF-transparent, strong, bonds into FG structure. |
| 5.5 | Threaded inserts | M3 and M4 brass | 30 pcs | ~30g | $0.50/pc | $15.00 | Various | Access panels, servo covers, wing mounting. |
| 5.6 | Stainless fasteners | M3, M4 bolts/nuts/washers kit | 1 kit | ~80g | $20.00 | $20.00 | Various | Corrosion resistant. |
| 5.7 | Push rods + clevis | 2mm steel rod + nylon clevis | 5 sets | ~60g | $4.00/set | $20.00 | [HobbyKing](https://hobbyking.com) | Servo-to-surface linkage. |
**Subtotal hardware: ~$180 / ~0.45 kg**
### 6. Belly Protection (Parachute Landing)
| # | Component | Specification | Qty | Weight | Unit Price | Total | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|----------|
| 6.1 | Replaceable belly panel | S2 FG / foam sandwich, 2mm skins + 3mm foam | 2 pcs (1+spare) | ~150g each | $15.00/pc | $30.00 | Sacrificial panel, field-swappable in <10 min. |
| 6.2 | EVA foam bumper strip | 15mm closed-cell, adhesive-backed | 1 m | ~40g | $5.00 | $5.00 | Wraps gimbal cavity. Absorbs minor impacts. |
**Subtotal belly protection: ~$35 / ~0.19 kg installed**
### 7. Parachute Recovery System
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 7.1 | Fruity Chutes FW Recovery Bundle | IFC-120-S Iris Ultra Compact + pilot chute + deployment bag + Y-harness + shock cord | 1 system | 950g | $830.00 | $830.00 | [Unmanned Systems Source](https://www.unmannedsystemssource.com/shop/parachutes/fixed-wing-bundles/fixed-wing-recovery-bundle-44lbs-20kg-15fps/) | Proven fixed-wing recovery system. IFC-120-S canopy rated 44lb (20kg) @ 15fps (4.6 m/s). Pilot chute ensures reliable air-stream deployment. Spectra shroud lines. Compact packing (190 cu"). Repackable. No pyrotechnics, no CO2 — just pilot chute + deployment bag for planned parachute landings. |
| 7.2 | Servo-actuated hatch | Spring-loaded door, triggered by autopilot | 1 | 80g | $30.00 | $30.00 | Custom | Autopilot triggers servo → spring ejects parachute bag into airstream. Same concept as Shark M: simple, reusable, no gases or explosives. |
| 7.3 | Parachute riser cutter | Servo-actuated line cutter | 1 | 30g | $40.00 | $40.00 | Custom | Cuts risers after touchdown to prevent wind drag. |
**Subtotal parachute: ~$900 / ~1.06 kg**
### 8. Propulsion
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 8.1 | T-Motor AT4120 KV250 | Long shaft pusher motor, 12S rated, 2100W max | 1 | 304g | $110.00 | $110.00 | [T-Motor Store](https://store.tmotor.com/product/at4120-long-shaft-vtol-pusher-motor.html) | 12S rated, triple-bearing long shaft for pusher config. At 40-50% throttle: 275W cruise, 7.8-8.7 g/W efficiency. 304g is lightweight for this power class. |
| 8.2 | T-Motor ALPHA 60A 12S ESC | FOC, 18-50.4V, 60A continuous | 1 | 73g | $110.00 | $110.00 | [T-Motor Store](https://store.tmotor.com/product/alpha-60a-12s-esc.html) | Matched to AT4120 motor. FOC for smooth low-RPM cruise. 60A continuous gives ample margin over ~7A cruise draw. Built-in protections. |
| 8.3 | APC 16×8E propeller | Thin electric, fiberglass nylon | 3 pcs (1+2 spare) | ~52g each | $10.00/pc | $30.00 | [APC Propellers](https://www.apcprop.com/product/16x8e/) | Excellent efficiency data matched with AT4120. 16" diameter for high propulsive efficiency at low RPM. Spares included — props are consumables. |
**Subtotal propulsion: ~$250 / ~0.43 kg installed**
### 9. Servos
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 9.1 | Digital metal gear servos | HV, 5-10 kg·cm torque, coreless | 5 pcs | ~175g total | $25.00/pc | $125.00 | [Savox](https://www.savox.com) / [KST](https://kstservos.com) | 2 aileron, 2 elevator, 1 rudder. Metal gears for reliability. HV (6-8.4V) powered direct from BEC. Coreless for precision and longevity. |
**Subtotal servos: ~$125 / ~0.18 kg**
### 10. Flight Controller & Navigation
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 10.1 | Holybro Pixhawk 6X Mini Set | STM32H753, triple IMU, PM02D power module | 1 set | ~38g | $313.00 | $313.00 | [Holybro](https://holybro.com/products/pixhawk-6x) | Industry standard for ArduPilot. Triple redundant IMU. Ethernet for Jetson link. Mini form factor for fixed-wing. |
| 10.2 | Holybro M10 GPS | u-blox M10, GPS/Galileo/GLONASS/BeiDou, compass | 1 | ~20g | $44.00 | $44.00 | [Holybro](https://holybro.com/collections/gps/products/m10-gps) | Matches Pixhawk 6X connector. Multi-constellation GNSS. Includes IST8310 compass, buzzer, safety switch. |
**Subtotal flight controller: ~$357 / ~0.06 kg**
### 11. Onboard Computer
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 11.1 | NVIDIA Jetson Orin Nano Super 8GB | 67 TOPS AI, ARM Cortex-A78AE | 1 | ~60g (board only) | $249.00 | $249.00 | [NVIDIA](https://www.nvidia.com/en-us/autonomous-machines/embedded-systems/jetson-orin/nano-super-developer-kit/) | Runs GPS-denied navigation (visual odometry, terrain matching) + AI reconnaissance pipeline. 67 TOPS for real-time inference. Ethernet to Pixhawk. |
**Subtotal compute: ~$249 / ~0.06 kg**
### 12. Cameras
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 12.1 | ADTI 26S V1 + 35mm lens | 26MP APS-C, Sony IMX571, mechanical shutter | 1 | ~122g | $1,890.00 | $1,890.00 | [UnmannedRC](https://unmannedrc.com/products/26mp-26s-v1-aps-c-mapping-camera) | GPS-denied navigation camera. Mechanical shutter eliminates rolling shutter distortion at speed. 21.6 cm/px GSD at 2 km. Lightest 26MP APS-C option (122g with lens). |
| 12.2 | Viewpro Z40K 4K gimbal | 4K 20× optical zoom, 3-axis stabilized, 25.9MP | 1 | ~595g | $3,000.00 | $3,000.00 | [Viewpro](https://www.viewprouav.com/product/z40k-single-4k-hd-25-times-zoom-gimbal-camera-3-axis-gimbal-uav-aerial-photography-cartography-and-patrol-inspection.html) | AI reconnaissance camera. 2.7 cm/px GSD at 2 km max zoom. 103×58m FoV in 4K. 479g lighter than Viewpro A40 Pro. PWM/TTL/SBUS control compatible with ArduPilot. |
**Subtotal cameras: ~$4,890 / ~0.72 kg**
### 13. Communications
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 13.1 | TBS Crossfire Nano RX | 915 MHz, long range RC receiver | 1 | ~2g | $30.00 | $30.00 | [GetFPV](https://www.getfpv.com/tbs-crossfire-nano-rx.html) | Long-range RC link (>40 km). Ultra-light. ArduPilot CRSF protocol support. |
| 13.2 | RFD900x telemetry modem (air) | 900 MHz, 1W, >40 km range, AES-128 | 1 | ~30g | $97.00 | $97.00 | [Droneyard](https://event38.com/product/rfd-900x-telemetry-set/) | MAVLink telemetry + mission commands. Encrypted. Long range. Pixhawk-native integration. |
**Subtotal comms: ~$127 / ~0.03 kg**
### 14. Power System
| # | Component | Specification | Qty | Weight | Unit Price | Total | Link | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|------|----------|
| 14.1 | Tattu 6S 33Ah 350 Wh/kg semi-solid | 22.2V, 10C, 2216g each, XT90-S | 4 pcs | 8.86 kg total | $750.00/pc | $3,000.00 | [GenStattu](https://genstattu.com/tattu-semi-solid-state-350wh-kg-33000mah-10c-22-2v-6s1p-g-tech-lipo-battery-pack-with-xt90-s-plug/) | 4× in 2S2P → 12S 66Ah (2930 Wh). 350 Wh/kg is highest available density in production. 500+ cycle life at 90% retention. Modular — individual pack replacement. |
| 14.2 | Power distribution board + BEC | 12S input, 5V/3A + 12V/3A BEC outputs | 1 | ~25g | $30.00 | $30.00 | Various | Powers servos (5V HV), Pixhawk, GPS, RC receiver. |
| 14.3 | Wiring + connectors + battery bus | 10-12AWG silicone, XT90, series adapters, parallel bus bar | 1 set | ~450g | $80.00 | $80.00 | Various | 2S2P wiring: 2× series adapters + parallel bus bar. Redundant connectors. |
**Subtotal power: ~$3,110 / ~9.34 kg**
### 15. Catapult Interface
| # | Component | Specification | Qty | Weight | Unit Price | Total | Why This |
|---|-----------|---------------|-----|--------|-----------|-------|----------|
| 15.1 | Belly mounting rails | Aluminum rails for catapult carriage attachment | 1 set | ~150g | $50.00 | $50.00 | Interface between airframe and pneumatic catapult carriage. Quick-release on launch. |
**Subtotal catapult interface: ~$50 / ~0.15 kg**
### 16. Field Repair Kit
| # | Component | Specification | Qty | Weight | Unit Price | Total |
|---|-----------|---------------|-----|--------|-----------|-------|
| 16.1 | S2-glass patches | 6oz, 150×150mm pre-cut | 10 pcs | ~50g | $2.00/pc | $20.00 |
| 16.2 | Field epoxy kit | Aeropoxy PR2032/PH3630 fast, 4oz | 1 | ~120g | $25.00 | $25.00 |
| 16.3 | Repair tools pouch | Cups, gloves, sandpaper, scissors, tape | 1 | ~200g | $15.00 | $15.00 |
| 16.4 | Spare belly panels | Pre-manufactured (item 6.1) | 3 pcs | ~450g (stored) | $15.00/pc | $45.00 |
**Subtotal repair kit: ~$105 / ~0.37 kg carried**
## Weight Summary
| Category | Weight |
|----------|--------|
| S2 FG skins + ribs + stiffeners (cured laminate) | ~3.80 kg |
| Foam core (in sandwich panels) | ~0.45 kg |
| CF wing spar (both halves, cured) | ~0.20 kg |
| Structural hardware (fittings, fasteners, hinges) | ~0.45 kg |
| Belly panel + bumper (installed) | ~0.19 kg |
| Catapult belly rails | ~0.15 kg |
| Parachute system | ~1.06 kg |
| **Airframe subtotal** | **~6.30 kg** |
| Motor + ESC + propeller | ~0.43 kg |
| Servos (×5) | ~0.18 kg |
| Pixhawk 6X + GPS | ~0.06 kg |
| Jetson Orin Nano Super | ~0.06 kg |
| ADTI 26S V1 + 35mm lens | ~0.12 kg |
| Viewpro Z40K gimbal | ~0.60 kg |
| TBS Crossfire Nano RX + RFD900x air | ~0.03 kg |
| Power distribution + wiring | ~0.48 kg |
| **Electronics subtotal** | **~1.96 kg** |
| 4× Tattu 6S 33Ah 350 Wh/kg | **8.86 kg** |
| **TOTAL** | **~17.12 kg** |
Margin to 18 kg MTOW: **~0.88 kg** (for paint, antenna, miscellaneous hardware)
## Per-UAV Cost Summary
| Category | Cost | % |
|----------|------|---|
| Composite fabrics | $280 | 3% |
| Resin system | $127 | 1% |
| Foam core | $109 | 1% |
| Consumables | $125 | 1% |
| Structural hardware | $180 | 2% |
| Belly protection | $35 | <1% |
| Parachute system | $900 | 8% |
| Field repair kit | $105 | 1% |
| **Airframe subtotal** | **$1,861** | **17%** |
| Propulsion (motor + ESC + props) | $250 | 2% |
| Servos | $125 | 1% |
| **Propulsion + actuators subtotal** | **$375** | **3%** |
| Pixhawk 6X Mini Set | $313 | 3% |
| GPS M10 | $44 | <1% |
| Jetson Orin Nano Super | $249 | 2% |
| **Avionics subtotal** | **$606** | **6%** |
| ADTI 26S V1 + 35mm (navigation) | $1,890 | 17% |
| Viewpro Z40K 4K gimbal (reconnaissance) | $3,000 | 27% |
| **Camera subtotal** | **$4,890** | **45%** |
| TBS Crossfire Nano RX | $30 | <1% |
| RFD900x air module | $97 | 1% |
| **Comms subtotal** | **$127** | **1%** |
| 4× Tattu 6S 33Ah 350 Wh/kg batteries | $3,000 | 27% |
| Power distribution + wiring | $110 | 1% |
| **Power subtotal** | **$3,110** | **28%** |
| Catapult belly rails | $50 | <1% |
| **TOTAL PER UAV** | **$11,019** | **100%** |
### Cost Drivers
The cameras (45%) and batteries (28%) together account for 73% of per-UAV cost. The airframe material is only 5% ($641 for fabrics + resin + foam). The parachute system at $900 is 8% — significantly reduced from the $2,310 ballistic system in earlier drafts by switching from the Peregrine CO2 ballistic system to the simpler FW Recovery Bundle (canopy + pilot chute + deployment bag). The UAV performs planned parachute landings, not emergency deployments — no ballistic launcher needed.
## Tooling (One-Time)
| # | Component | Cost | Amortization |
|---|-----------|------|-------------|
| 9.1 | Fuselage mold set (FG/epoxy female, L+R halves) | $800 | 50+ pulls |
| 9.2 | Wing mold set (FG/epoxy female, upper+lower) | $600 | 50+ pulls |
| 9.3 | Tail surface molds (H-stab + V-stab) | $400 | 50+ pulls |
| 9.4 | Wing spar jig (aluminum + MDF fixture) | $200 | 100+ uses |
| 9.5 | Vacuum pump (2.5 CFM electric) | $150 | Permanent |
| 9.6 | CNC foam plug machining (outsourced) | $1,500 | One-time |
| | **Total tooling** | **$3,650** | |
## Ground Equipment (One-Time, Shared)
| # | Component | Cost | Notes |
|---|-----------|------|-------|
| G.1 | TBS Crossfire TX module | $100 | Shared across fleet, plugs into RC transmitter |
| G.2 | RFD900x ground station modem | $200 | Shared GCS telemetry module |
| G.3 | RC transmitter (e.g. RadioMaster TX16S) | $200 | If not already owned |
| G.4 | Pneumatic catapult (ELI PL-60 class) | $15,000-25,000 | Shared launch system; 108 kg, 2 transport cases |
| | **Total GCS equipment (excl. catapult)** | **$500** | |
## Labor
| # | Task | Hours (first 5 units) | Hours (at 100 units) | Rate |
|---|------|----------------------|---------------------|------|
| L.1 | Mold prep + release | 2h | 1h | Technician |
| L.2 | Fuselage skin layup + vacuum bag + cure | 8h | 5h | Technician |
| L.3 | Wing skin layup + vacuum bag + cure | 6h | 4h | Technician |
| L.4 | CF wing spar layup + cure | 3h | 2h | Technician |
| L.5 | Tail surface layup + cure | 3h | 2h | Technician |
| L.6 | Demolding + trimming | 4h | 2.5h | Technician |
| L.7 | Assembly (bond ribs, fittings, hardware) | 8h | 5h | Technician |
| L.8 | Electronics integration + wiring | 6h | 4h | Technician |
| L.9 | Parachute system install + test | 2h | 1.5h | Technician |
| L.10 | Finishing (fill, sand, paint) | 6h | 4h | Technician |
| L.11 | Quality inspection + flight test | 4h | 2h | Senior tech |
| | **Total labor per airframe** | **~52h** | **~33h** | |
## Fleet Cost — 5 Aircraft
| Item | Calculation | Cost |
|------|------------|------|
| **Tooling (one-time)** | Molds + jigs + CNC plugs + vacuum pump | $3,650 |
| **GCS equipment (one-time)** | TX module + RFD900x ground + RC transmitter | $500 |
| **UAV components × 5** | $11,019 × 5 | $55,095 |
| **Labor × 5** | 52h × 5 × $30/h | $7,800 |
| **Spare parts stock** | Extra belly panels, props, connectors | $600 |
| | | |
| **Total for 5 aircraft** | | **$67,645** |
| **Per aircraft (all-in, incl. tooling)** | | **$13,529** |
| **Per aircraft (excl. tooling, marginal)** | | **$12,699** |
**Note**: Catapult ($15,000-25,000) is listed separately as ground equipment — not included in per-aircraft cost. It's a shared infrastructure item amortized across operations, not per-unit.
### Cost Breakdown — 5 Aircraft
| Category | Amount | % |
|----------|--------|---|
| Cameras (×5) | $24,450 | 36% |
| Batteries (×5) | $15,000 | 22% |
| Airframe materials (×5) | $9,305 | 14% |
| Labor | $7,800 | 12% |
| Avionics + compute (×5) | $3,030 | 4% |
| Tooling | $3,650 | 5% |
| Propulsion + servos (×5) | $1,875 | 3% |
| Comms (×5) + GCS equip. | $1,135 | 2% |
| Spares + repair kits | $1,125 | 2% |
| Catapult interface (×5) | $250 | <1% |
## Fleet Cost — 100 Aircraft
At 100 units, bulk pricing and learning-curve labor savings:
| Item | Unit Price Change | Reasoning |
|------|------------------|-----------|
| S2 FG cloth | $7.50/yd (−28%) | Bolt pricing from AGY distributor |
| CF UD tape | $2.50/m (−47%) | 800m order |
| Epoxy resin | $65/qt kit (−20%) | 5-gallon drums |
| Foam core | $6.50/sheet (−29%) | Case quantity from Diab |
| Consumables | $80/set (−36%) | Roll quantities |
| Hardware | $140/set (−22%) | Batch CNC, bulk fasteners |
| Parachute | $700/unit (−16%) | Volume discount from Fruity Chutes |
| Motor AT4120 | $95 (−14%) | 100+ order from T-Motor |
| ESC ALPHA 60A | $95 (−14%) | 100+ order from T-Motor |
| Batteries | $650/pc (−13%) | Tattu bulk/OEM pricing |
| ADTI 26S V1 | $1,700 (−10%) | Volume pricing |
| Viewpro Z40K | $2,500 (−17%) | Direct OEM/volume |
| Pixhawk 6X Mini | $250 (−20%) | Holybro 100+ discount tier |
| GPS M10 | $33 (−25%) | Holybro 100+ discount |
| Jetson Orin Nano | $199 (−20%) | NVIDIA volume/module pricing |
| RFD900x | $85 (−12%) | Bulk order |
| Servos | $20/pc (−20%) | Bulk order |
| Labor | 33h × $30/h = $990 (−37%) | Learning curve, jigs, repetition |
| Item | Calculation | Cost |
|------|------------|------|
| **Tooling** | 2 mold sets (50 pulls each) + jigs + vacuum | $7,300 |
| **Airframe materials × 100** | Bulk-priced fabrics + resin + foam + consumables + hardware | $116,000 |
| **Parachute systems × 100** | $700 × 100 | $70,000 |
| **Propulsion × 100** | (95 + 95 + 25) × 100 | $21,500 |
| **Servos × 100** | $100 × 100 | $10,000 |
| **Cameras × 100** | ($1,700 + $2,500) × 100 | $420,000 |
| **Avionics × 100** | ($250 + $33 + $199) × 100 | $48,200 |
| **Comms × 100** | ($30 + $85) × 100 | $11,500 |
| **Power system × 100** | ($2,600 + $100) × 100 | $270,000 |
| **Catapult interface × 100** | $40 × 100 | $4,000 |
| **Repair kits × 100** | $80 × 100 | $8,000 |
| **Labor × 100** | 33h × $30 × 100 | $99,000 |
| **Spare parts stock** | Belly panels, props, misc | $8,000 |
| **Quality tools** | Ultrasonic tester, etc. | $2,000 |
| **GCS equipment** | 5 GCS sets at $500 each | $2,500 |
| | | |
| **Total for 100 aircraft** | | **$1,098,000** |
| **Per aircraft (all-in)** | | **$10,980** |
| **Per aircraft (excl. tooling, marginal)** | | **$10,883** |
### Cost Breakdown — 100 Aircraft
| Category | Amount | % |
|----------|--------|---|
| Cameras | $420,000 | 38% |
| Power (batteries + wiring) | $270,000 | 25% |
| Airframe materials | $116,000 | 11% |
| Labor | $99,000 | 9% |
| Parachute systems | $70,000 | 6% |
| Avionics + compute | $48,200 | 4% |
| Propulsion + servos | $31,500 | 3% |
| Comms + GCS | $14,000 | 1% |
| Tooling + quality tools | $9,300 | 1% |
| Repair/spares | $16,000 | 2% |
| Catapult interface | $4,000 | <1% |
### Scaling Comparison
| Metric | 5 Aircraft | 100 Aircraft | Savings at Scale |
|--------|-----------|-------------|-----------------|
| Per-aircraft total cost | $13,529 | $10,980 | −19% |
| Per-aircraft airframe | $1,861 | $1,160 | −38% |
| Per-aircraft cameras | $4,890 | $4,200 | −14% |
| Per-aircraft batteries | $3,000 | $2,600 | −13% |
| Per-aircraft labor | $1,560 | $990 | −37% |
| Tooling per aircraft | $730 | $73 | −90% |
| Parachute per aircraft | $900 | $700 | −22% |
Scaling savings are modest (19%) because cameras and batteries dominate cost and have limited bulk discount potential. The largest percentage savings come from tooling amortization (−90%) and labor learning curve (−37%).
### Parachute System Alternatives
The FW Recovery Bundle at $830 is the recommended baseline. For reference, other options:
| System | Price | Weight | Rated | Deployment | Pro | Con |
|--------|-------|--------|-------|-----------|-----|-----|
| **Fruity Chutes FW Bundle (recommended)** | $830 | 950g | 20 kg @ 15fps | Pilot chute + deployment bag (air-stream) | Proven, sized right, includes harness, repackable | 2-4 week lead time |
| Fruity Chutes Peregrine UAV 5 Light | $2,310 | 1,480g | 20 kg @ 15fps | CO2 ballistic ejection | Fastest deployment, works at zero airspeed | 2.8× more expensive, heavier, CO2 cartridge consumable |
| Foxtech Parachute + Ejector 20kg | $899 | 1,600g | 20 kg | Servo + spring | Cheaper than Peregrine | Designed for multirotor vertical eject, heavier, unproven for FW |
| Skycat X68 + IFC-84-SUL | ~$1,100 | 420g | 17 kg max | Skycat Fuse® | Lightest system, fast deployment | Max 17 kg — borderline for 18 kg MTOW |
| DIY: Rocketman 120" + custom deployment | ~$350 | ~600g est. | ~18 kg | Servo hatch + spring | Cheapest | Unproven for this weight class, 4 shroud lines only |
## References
1. S2-glass cloth: https://www.carbonfiberglass.com/product/6oz-s-glass-27-width-html/
2. CF UD tape: https://www.easycomposites.co.uk/250g-unidirectional-carbon-fibre-tape
3. Aeropoxy PR2032: https://www.aircraftspruce.com/catalog/pnpages/01-42135.php
4. PVC foam core: https://www.easycomposites.us/easycell75-closed-cell-pvc-foam
5. Fruity Chutes FW Bundle: https://www.unmannedsystemssource.com/shop/parachutes/fixed-wing-bundles/fixed-wing-recovery-bundle-44lbs-20kg-15fps/
6. T-Motor AT4120: https://store.tmotor.com/product/at4120-long-shaft-vtol-pusher-motor.html
7. T-Motor ALPHA 60A: https://store.tmotor.com/product/alpha-60a-12s-esc.html
8. APC 16×8E: https://www.apcprop.com/product/16x8e/
9. Holybro Pixhawk 6X: https://holybro.com/products/pixhawk-6x
10. Holybro M10 GPS: https://holybro.com/collections/gps/products/m10-gps
11. Jetson Orin Nano Super: https://www.nvidia.com/en-us/autonomous-machines/embedded-systems/jetson-orin/nano-super-developer-kit/
12. ADTI 26S V1: https://unmannedrc.com/products/26mp-26s-v1-aps-c-mapping-camera
13. Viewpro Z40K: https://www.viewprouav.com/product/z40k-single-4k-hd-25-times-zoom-gimbal-camera-3-axis-gimbal-uav-aerial-photography-cartography-and-patrol-inspection.html
14. TBS Crossfire Nano RX: https://www.getfpv.com/tbs-crossfire-nano-rx.html
15. RFD900x: https://event38.com/product/rfd-900x-telemetry-set/
16. Tattu 350Wh/kg 6S 33Ah: https://genstattu.com/tattu-semi-solid-state-350wh-kg-33000mah-10c-22-2v-6s1p-g-tech-lipo-battery-pack-with-xt90-s-plug/
17. Foxtech Parachute 20kg: https://store.foxtech.com/parachute-for-20kg-uav-airplanes/
18. Skycat X68: https://www.skycat.pro/shop/skycat-x68-3zdz9
19. Rocketman parachutes: https://www.the-rocketman.com/products/ultra-light-high-performance-drone-parachutes
## Related Artifacts
- Previous drafts: `solution_draft01.md` through `solution_draft06.md`
- Research artifacts: `_standalone/UAV_frame_material/00_research/UAV_frame_material/`