Froude-scaled version of the 36,000 lb trimaran seastead concept
| Component | Full Scale | 1:4 Model |
|---|---|---|
| Triangle sides (long) | 70 ft | 17 ft 6 in |
| Triangle base (back) | 35 ft | 8 ft 9 in |
| Triangle height (floor to ceiling) | 7 ft | 1 ft 9 in |
| Leg length | 19 ft | 4 ft 9 in |
| Leg chord | 10 ft | 2 ft 6 in |
| Leg thickness | 3 ft | 9 in |
| Stabilizer wingspan | 12 ft | 3 ft |
| Stabilizer chord | 1.5 ft | 4.5 in |
| Stabilizer fuselage length | 6 ft | 1 ft 6 in |
| Stabilizer elevator span | 2 ft | 6 in |
| Thruster diameter | 1.5 ft | 4.5 in |
| Rear deck width | 5 ft | 1 ft 3 in |
Full scale displacement: 36,000 lbs
Scale factor: 1/64 (cube of 1/4)
Target model weight: 562.5 lbs
| Component | Est. Weight (lbs) |
|---|---|
| Triangle frame + cross members (2" angle aluminum) | 185 |
| 3× NACA 0030 legs (aluminum) | 135 |
| 3× Stabilizers (airplane style) | 42 |
| 6× Blue Robotics M200 thrusters + mounts | 36 |
| Batteries (LiFePO4, 30% of weight) | 169 |
| Solar panels + mounting | 55 |
| Starlink Mini + electronics + cameras | 18 |
| Wiring, fasteners, misc | 22 |
| Total | 662 lbs |
Note: Slightly over budget. Recommend reducing aluminum thickness in non-structural areas or using some carbon fiber in the triangle to hit ~560 lbs.
30% of target weight = 169 lbs of LiFePO4 batteries ≈ 8.5 kWh usable (leaving 20% reserve).
| Condition | Available Power |
|---|---|
| Daytime (solar) | ~650–750 W to motors |
| Nighttime (battery only) | ~280–320 W to motors |
| Direction | Day (W) | Night (W) |
|---|---|---|
| Downwind | 5.8–6.4 knots | 3.1–3.4 knots |
| Crosswind | 5.2–5.7 knots | 2.8–3.1 knots |
| Upwind | 4.1–4.5 knots | 2.2–2.5 knots |
Estimated BOM cost per unit: $4,800–$5,600
Competitive pricing for a fully autonomous ocean USV with 6 thrusters and active stabilization.