Seastead Scale Model Design

Seastead Scale Model Design and Testing

1:10.5 Scale Model Dimensions
Using Froude scaling rules, the dimensions of the 1:10.5 scale model are as follows:
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Component Full-Scale Dimension Scale Model Dimension (inches)

Triangle Frame (side) 44.0 feet 60.5 inches

Wall Height 7.0 feet 91.8 inches

Leg Length 21.5 feet 282.6 inches

Walkway Width 3.0 feet 40.5 inches

walkway Height 4.0 feet 54.0 inches

Structural Beams (side) 22.0 feet 301.5 inches

Component	Full-Scale Dimension	Scale Model Dimension (inches)
Triangle Frame (side)	44.0 feet	60.5 inches
Wall Height	7.0 feet	91.8 inches
Leg Length	21.5 feet	282.6 inches
Walkway Width	3.0 feet	40.5 inches
walkway Height	4.0 feet	54.0 inches
Structural Beams (side)	22.0 feet	301.5 inches

1:10.5 Scale Model Weight
The total weight of the 1:10.5 scale model, assuming a scale factor of 1:10.5, is calculated as follows:

Full-scale displacement: >= 27,500 lbs (buoyancy)

Scale factor for volume: $(1/10.5)^3 = 1/1157.63$
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Model displacement: $27,500 / 1157.63 \approx 23.76$ lbs
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Total weight of the model (including parts and structural elements): ~25 lbs
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Wave Height Simulation
To simulate full-scale wave heights of 3 feet, 5 feet, and 8 feet, the scale height of the model waves should be scaled by the Froude number. Assuming a water depth of 1.5 times the leg length (32.25 feet for full-scale), the scale water depth for the model is approximately 3.07 inches> (1.5 feet in full scale).

Use apps like Phyphox> or Open creativity Physics> for measuring accelerometers, pitch, roll, and heave in your model.

Accelerations and Sliding Threshold
The Froude number relates acceleration in the model to full-scale acceleration as follows:

Full-scale acceleration for 3 ft waves: ~0.7 g
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Model acceleration for 3 ft waves: $0.7 / 10.5 \approx 0.067 g$
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In full scale, plates might start sliding at accelerations above 0.5-1.0 g. For the model scale (1:10.5), this corresponds to approximately 0.0034-0.0067 g> in the model.

Scaling Water and Visualization
To simulate deep water waves, use a water depth of at least 1.5 times the leg length (32.25 feet in full scale, or ~3 inches in the model). Add small objects (e.g., 1-inch dolls) to give a sense of scale.

Measurement Tools
Additional tools for measuring your model:

High-speed video camera (e.g., Phantom or GoPro) to record slow-motion footage
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Tri-pod for the main camera
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Accelerometer apps (e.g., Phyphox, Open creativity Physics) for real-time data
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Long wooden pole with marks to measure wave heights
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Glass setup with water and rocks to observe water movement
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Scaling Water and Visualization To simulate deep water waves, use a water depth of at least 1.5 times the leg length (32.25 feet in full scale, or ~3 inches in the model). Add small objects (e.g., 1-inch dolls) to give a sense of scale.

Scaling Water and Visualization
To simulate deep water waves, use a water depth of at least 1.5 times the leg length (32.25 feet in full scale, or ~3 inches in the model). Add small objects (e.g., 1-inch dolls) to give a sense of scale.