Based on your description, here are the key parameters used for calculations:
Living area roof: 12 ft × 35 ft = 420 sq ft
Two panels, each 8 ft × 35 ft = 280 sq ft each.
Total fold-down area: 2 × 280 = 560 sq ft
Total: 420 + 560 = 980 sq ft
Assuming high-efficiency marine solar panels (~20 W/sq ft):
980 sq ft × 20 W/sq ft = 19,600 W (~20 kW)
Note: Actual output varies with panel efficiency, angle, weather, and temperature.
| Component | Estimated Weight (lbs) | Notes |
|---|---|---|
| Triangular Frame (40 ft sides) | ~2,500 | Assuming 6"×6"×0.25" box beams |
| Living Area Structure | ~4,000 | Walls, floor, roof framing |
| 3 Legs (19 ft each) | ~3,600 | NACA foil shape, 10 ft chord, 2 ft thick |
| Netting, Railings, Misc. | ~900 | |
| Total Structure | ~11,000 lbs |
Submerged volume per leg (50% of 19 ft):
Approximate foil cross-section area (NACA 0015, 10 ft chord, 2 ft max thickness): ~0.75 × chord × thickness = 0.75 × 10 × 2 = 15 sq ft
Submerged volume per leg: 15 sq ft × 9.5 ft = 142.5 cu ft
Total for 3 legs: 3 × 142.5 = 427.5 cu ft
Buoyancy force (seawater ~64 lbs/cu ft): 427.5 × 64 = 27,360 lbs
Total buoyancy: 27,360 lbs
Minus structure weight: 11,000 lbs
Remaining buoyancy: ~16,360 lbs for equipment, batteries, water, people, boat, etc.
Waterplane area of one leg: chord × width = 10 ft × 2 ft = 20 sq ft (approximate)
Buoyancy change per foot of immersion: 20 sq ft × 64 lbs/cu ft = 1,280 lbs per leg
Yes, if a stabilizer can reduce wave encounter by 1 ft at crest and trough, a 4 ft wave feels like ~2 ft. However, this is a simplification—actual motion depends on wave frequency, boat speed, and stabilizer effectiveness.
Using simplified lift equation: Lift = 0.5 × ρ × V² × A × C_L
At 5 knots (~8.4 ft/s), seawater ρ = 1.99 slugs/cu ft, desired lift ~1,280 lbs (to counteract 1 ft immersion change), C_L ~0.5 (moderate angle of attack).
Solving for area A: A = (2 × 1280) / (1.99 × 8.4² × 0.5) ≈ 18.2 sq ft
This is plausible with a small wing (e.g., 4 ft span × 4.5 ft chord). Mounted on each leg.
| Item | Estimated Cost (USD) | Weight (lbs) |
|---|---|---|
| Aluminum foil assembly | $1,200 | ~35 |
| Actuator (waterproof, marine) | $1,800 | ~15 |
| Mounting & hardware | $400 | ~10 |
| Total per stabilizer | $3,400 | ~60 lbs |
Costs assume batch of 20 made in China, including basic control integration.
Resistance estimated for SWATH-like vessel with three foils. Power = Resistance × Speed.
| Speed (knots) | Estimated Resistance (lbs) | Power Required (W) |
|---|---|---|
| 4 | ~300 | ~2,400 |
| 5 | ~500 | ~5,000 |
| 6 | ~800 | ~9,600 |
Includes added drag from stabilizers. Actual power depends on sea state, fouling, etc.
4000 lbs LiFePO4 ≈ 200 kWh (assuming ~50 Wh/lb).
Usable capacity (80% DoD): 160 kWh.
| Speed (knots) | Power Draw (kW) | Hours Endurance | Range (miles) |
|---|---|---|---|
| 4 | 2.4 | ~66.7 | ~267 |
| 5 | 5.0 | ~32.0 | ~160 |
| 6 | 9.6 | ~16.7 | ~100 |
At 5 knots, a well-tuned stabilizer could reduce effective wave height by 30–50%. For a 4 ft wave, this means a felt height of 2–2.8 ft. Effectiveness increases with speed.
SWATH designs inherently reduce motion. With active stabilizers:
| Wave Height (ft) | Speed (knots) | Estimated Vertical Motion (ft) |
|---|---|---|
| 3 | 4 | ~0.6 – 0.9 |
| 4 | 5 | ~0.8 – 1.2 |
| 5 | 6 | ~1.0 – 1.5 |
Without stabilizers, motion might be 50–100% higher.
20 kW array × 5.5 peak sun hours = 110 kWh/day.
Subtract 1000 W for non-propulsion (24 kWh/day), leaving 86 kWh/day for propulsion.
Power available: 86,000 Wh / 24 h = ~3,583 W continuous.
Interpolating from earlier table: ~4.2 knots sustainable.
Stabilizers add ~20% to propulsion power demand. Effective power for propulsion: 86 kWh × 0.8 = 68.8 kWh/day → ~2,867 W continuous.
Sustainable speed: ~3.8 knots.
Stabilizers improve comfort but reduce speed slightly due to added drag.
| Component | Estimated Cost (USD) – Single | Per Unit in Batch of 20 |
|---|---|---|
| Aluminum structure (frame, living area, legs) | $45,000 | $36,000 |
| Solar panels & installation | $20,000 | $16,000 |
| Battery system (4000 lbs LiFePO4) | $60,000 | $48,000 |
| Thrusters (6 rim-drive) | $30,000 | $24,000 |
| Stabilizers (3 sets) | $10,200 | $8,160 |
| Interior, systems, netting, davit, etc. | $25,000 | $20,000 |
| 14 ft RIB + outboard | $15,000 | $12,000 |
| Engineering, assembly, testing | $30,000 | $24,000 |
| Total Estimated Cost | $235,200 | $188,160 |
Batch savings assume ~20% reduction due to tooling, material purchases, and labor efficiency. Excludes shipping, import duties, and certification.
Disclaimer: These are preliminary engineering estimates. Actual performance requires detailed naval architecture, model testing, and prototype validation.