| Component | Full Size | Half Size |
|---|---|---|
| Triangle Sides (two sides) | 70 ft | 35 ft |
| Triangle Side (back) | 35 ft | 17.5 ft |
| Truss Height | 7 ft | 3.5 ft |
| Leg/Wing Length | 19 ft | 9.5 ft |
| Leg/Wing Chord | 10 ft | 5 ft |
| Leg/Wing Thickness | 3 ft | 1.5 ft |
| Stabilizer Wingspan | 10 ft | 5 ft |
| Stabilizer Chord | 1 ft | 0.5 ft |
| Stabilizer Body Length | 6 ft | 3 ft |
| Dinghy | 14 ft RIB | 7 ft inflatable |
| Component | Weight (lb) | Notes |
|---|---|---|
| Triangle Truss (Aluminum) | 1500 | Estimated from tube lengths and typical truss construction |
| 3 Legs/Wings (Aluminum) | 1000 | NACA 0030 foil shape, 1/8" skin with internal frames |
| 3 Stabilizers & Actuators | 75 | Small airplane-like structures with actuators |
| 2 Yamaha HARMO RIM Drives | 140 | ~70 lb each |
| Batteries (50 kWh Li-ion) | 1320 | ~26.4 lb/kWh |
| Seats & Net | 90 | 4 seats and a trampoline net |
| Dinghy (7 ft inflatable) | 50 | |
| Miscellaneous | 200 | Wiring, controls, safety gear, etc. |
| Total Estimated Weight | 4375 |
Buoyancy at 50% Leg Submersion: 4678.56 lb
Current Weight: 4375 lb
Waterline: ~46.8% of leg height submerged (slightly below half).
Maximum Buoyancy (legs 100% submerged): 9357.12 lb
Extra Load Capacity at 80% Submersion: 3110 lb
Extra Load Capacity at 100% Submersion: 4982 lb
Note: Avoid full submersion to prevent wave overtopping. The 80% limit is recommended for safety.
| Speed (knots) | Power Draw (kW) | Running Time (hours, 80% DoD) | Range (nautical miles) |
|---|---|---|---|
| 4 | 1.83 | 21.9 | ~87 |
| 5 | 3.43 | 11.7 | ~58 |
Assumptions: 50% overall efficiency, constant speed, no waves. Drag estimates based on NACA 0030 foil drag coefficient of 0.01.
| Item | Estimated Cost (USD) |
|---|---|
| Aluminum Structure (truss & legs) | $22,660 |
| Stabilizers & Actuators | $3,000 |
| 2 Yamaha HARMO RIM Drives | $10,000 |
| Batteries (50 kWh) | $25,000 |
| Solar Panels (200 sq ft, ~3 kW) | $6,000 |
| Seats & Net | $1,000 |
| Dinghy (7 ft inflatable) | $1,000 |
| Miscellaneous (wiring, controls, etc.) | $5,000 |
| Shipping (40 ft container from China) | $5,000 |
| Total Estimated Cost | $78,660 |
Note: Costs are rough estimates; actual costs may vary. Labor for assembly is assumed free.
The half-size prototype is feasible and should be an enjoyable day sailor with a range of 60–90 nautical miles at 4–5 knots. The design leverages foil-shaped legs for low drag and stabilizers for a smooth ride. The total cost is estimated under $80,000, assuming self-assembly.