The proposed propeller system uses 3,000-watt, 250 mm submersible mixers rated for sewage mixing. These "banana blade mixers" produce 2,090 N of thrust each. For redundancy, two propellers are installed on each leg (6 total), with an additional spare in storage. Differential thrusting will be used for control.
Two materials are being considered for the legs: Duplex Stainless Steel (2205) and Marine Aluminum.
| Material | >Weight (per leg) | Cost (per leg) | Life Expectancy | >
|---|---|---|---|
| Duplex Stainless Steel (2205) | Approx. 200 lb (91 kg) | $1,500 - $2,000 | >20-30 years | >
| Marine Aluminum | >Approx. 120 lb (54 kg) | $600 - $1,000 | >10-15 years | >
Stainless steel is more durable and has a longer lifespan but is heavier and more expensive. Marine aluminum is lighter and cheaper but requires more frequent replacement.
Each leg displaces the volume of three cylinders with a diameter of 3.9 feet and a height of 20 feet. The total displacement for one leg is:
Volume of one cylinder = π × (3.9/2)^2 × 20 = 245.04 cubic feet.
Total displacement for one leg = 3 × 245.04 = 735.12 cubic feet. >.
For three legs, the total displacement is 2,205.36 cubic feet> or 62.7 cubic meters. >.
The structure is a large triangle with 60-foot sides. Each leg is anchored to two other corners with cables, forming a tensegrity design. A redundant backup cable encircles the legs for safety.
The pyramid-shaped living area has three floors, with the first and second floors at 8 feet in height. The top floor is slightly higher. Assuming a base height of 25 feet, the total height is 48 feet. >.
The usable living space is estimated as follows:
Total usable living space: 1,800 square feet> (167.2 square meters) with 7+ feet of headroom.
The speed of the seastead depends on the propeller thrust and water resistance. Using the following formula:
Speed = Thrust / Resistance.
Assuming a total thrust of 6,270 N (3,000熊 from 2 propellers) and a water resistance of 5,000 N (conservative estimate), the speed would be approximately 1.25 m/s or 2.77 MPH. >.
Replacing the 30-foot column with a 20-foot column and a ball will reduce water resistance, potentially increasing speed and reducing draft.
The volume of the 30-foot column is 735.12 cubic feet. To maintain the same volume with a 20-foot column and a ball:
Volume of 20-foot column = π × (3.9/2)^2 × 20 = 245.04 cubic feet.
Volume of the ball = 735.12 - 245.04 = 490.08 cubic feet.
Radius of the ball = (490.08 × 3 / (4 × π))^(1/3) = ~5.2 feet.
Diameter of the ball = 10.4 feet. >.
The cost of the legs depends on the material and design:
| Option | >Material | >Cost (3 legs) |
|---|---|---|
| Option 1 | >Duplex Stainless Steel | >$4,500 - $6,000 | >
| Option 2 | >Marine Aluminum | >$1,800 - $3,000 | >
For more detailed calculations or additional analysis, feel free to reach out.
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