The design features a primary equilateral triangle frame with a rectangular living structure integrated into it.
| Metric | Calculation | Result |
|---|---|---|
| Triangle Area | Side = 80 ft. Area = (√3 / 4) * side² | ~2,771 sq ft (0.064 acres) |
| Living Area Length | Triangle Height = 69.3 ft. Width starts at 14 ft approx 12.1 ft from the front tip. Length = 69.3 - 12.1 | ~57.2 feet |
| Living Area Square Footage | Width (14 ft) * Length (57.2 ft) | ~800 sq ft |
| Feature | Duplex Stainless Steel (2205) | Marine Aluminum (5083/5086) |
|---|---|---|
| Weight | Heavier (Density ~7.8 g/cm³). Requires thinner gauges for strength, but still heavier than Al. | Lighter (Density ~2.7 g/cm³). Standard for high-performance marine hulls. |
| Cost | High. Raw material is expensive; welding requires high skill and specific consumables. | Moderate. Material is cheaper than 2205; welding is standard in shipbuilding. Fabrication is faster. |
| Life Expectancy | Excellent. Highly resistant to corrosion and stress cracking. Ideal for long-term stationary structures. | Very Good. Excellent corrosion resistance in salt water. Susceptible to galvanic corrosion if not isolated from other metals. Paints/coatings required for aesthetics and anti-fouling. |
| Recommendation | Marine Aluminum is recommended for the frame and floats due to weight savings (critical for buoyancy) and lower fabrication cost. The weight savings allow for more battery and payload capacity. Stainless fasteners/hardware can be used for wear points. | |
Assuming the seastead turns to point into the wind (lowest drag profile). The "Front" leg aligns with the wind. Frontal area is minimized.
| Wind Speed | Est. Drag Force | Power to Hold Station |
|---|---|---|
| 30 MPH (26 Knots) | ~600 lbs | ~10 kW |
| 40 MPH (35 Knots) | ~1,100 lbs | ~20 kW |
| 50 MPH (43 Knots) | ~1,700 lbs | ~35 kW |
Note: Power estimates assume propeller efficiency of ~50% at low speeds. The available 7.3 kW continuous power from batteries (or 32 kW solar peak) is sufficient to hold station in 30 MPH winds, but higher winds would drain batteries quickly if not actively sailing.
By using the legs as keels (10 ft chord, 4 ft width), the vessel can "slide" sideways minimally. The legs provide significant lateral resistance. Aiming 10-15 degrees upwind, the wind force generates lift (forward motion) rather than just drag. With 50 MPH winds, the apparent wind and force would likely be too high for the structure to "power through" without significant drift, but in 30-40 MPH winds, this vessel could make way forward efficiently, essentially acting as a drift-powered vessel with the ability to motorsail.
Estimates based on Chinese manufacturing (Aluminum construction) and component sourcing.
| Item | Est. Weight (lbs) | Est. Cost ($) |
|---|---|---|
| 1. Legs (3 Aluminum Hulls) | 5,500 | $35,000 |
| 2. Body (Triangle & Rect Frame) | 7,000 | $45,000 |
| 4. 6 RIM Drive Thrusters | 1,200 | $24,000 |
| 6. Solar Panels (32kW System) | 4,000 | $16,000 |
| 7. Solar Charge Controllers | 100 | $4,500 |
| 8. Batteries (350 kWh LiFePO4) | 2,700 | $42,000 |
| 9. Inverters (3x 5kW) | 150 | $6,000 |
| 10. Water Makers & Storage | 500 | $8,000 |
| 11. Air Conditioning Units | 400 | $6,000 |
| 12. Insulation (Closed Cell Foam) | 600 | $4,000 |
| 13. Interior Finish/Furniture | 4,000 | $25,000 |
| 14. Waste Tanks | 200 | $1,500 |
| 15. Glass & Doors | 1,500 | $8,000 |
| 16. Refrigeration | 200 | $3,000 |
| 17. Biofouling (Wet weight year 1) | 1,500 | $0 (Maintenance) |
| 18. Safety Equipment | 300 | $5,000 |
| 19. Dinghy (14ft RIB + Motor) | 600 | $12,000 |
| 20. Sea Anchors (2) | 100 | $2,000 |
| 21. Kite Propulsion System | 200 | $8,000 |
| 22. Air Bags (Safety redundancy) | 200 | $2,000 |
| 23. Starlink (2 units) | 30 | $3,000 |
| 24. Trash Compactor | 100 | $1,500 |
| 25. Davit/Crane | 400 | $5,000 |
| Totals | ~30,000 lbs | ~$267,000 |
Note: Total weight is comfortably under the ~38,000 lbs buoyancy reserve limit (Total displacement 73k lbs - Structure 30k lbs = 43k lbs capacity for people/water/gear).
This design is a "Small Waterplane Area Trimaran" (SWATH-like). Because the buoyancy is deep underwater (bottom half of legs) and the hulls are far apart (80ft triangle), stability is immense compared to a normal boat.
| Wave Type | Front On (Pitch) | Side On (Roll) |
|---|---|---|
| 3ft / 3s | Tipping: ~0 inches. Gs: 0.01g (Imperceptible). | Tipping: ~0 inches. Gs: 0.005g (Rock solid). |
| 5ft / 5s | Tipping: ~1 inch height diff. Gs: 0.03g (Very smooth). | Tipping: <1 inch. Gs: 0.01g (Stable platform). |
| 7ft / 7s | Tipping: ~3-4 inches height diff. Gs: 0.08g (Gentle rock). | Tipping: ~2 inches. Gs: 0.04g (Highly stable). |
Analysis: The center of the triangle is the most stable point on earth. The "G" forces here are negligible. This is a "motion sickness free" zone.
Flag of Convenience (Panama/Liberia): Yes, this can be registered as a "Trimaran Yacht" or "Private Yacht".
| Metric | Value |
|---|---|
| Estimated Total Cost (1st Unit) | $267,000 |
| Estimated Cost (Order 20 Units) | $210,000 per unit |
| Avg Solar Produced | 175 kWh / day |
| Avg Solar Used (House) | 85 kWh / day |
| Avg Power for Propulsion | 3.8 kW continuous (90 kWh/day) |
| Extra Buoyancy (Payload) | ~28,000 lbs (approx 12 tons) |
| Avg Cruising Speed (24/7) | 5.0 - 5.5 MPH (4.5 Knots) |