Scale Factor: 1:10.5 (λ = 1/10.5 ≈ 0.09524)
This document provides Froude-scaled dimensions, testing parameters, and measurement recommendations for your seastead model to be tested in Sandy Hill Bay, Anguilla.
| Component | Full Scale | Model (inches) |
|---|---|---|
| Triangle Base (back) | 35 ft | 40.0 |
| Triangle Sides (left & right) | 70 ft | 80.0 |
| Structure Height (floor to ceiling) | 7 ft | 8.0 |
| Leg Length (total) | 19 ft | 21.71 |
| Leg Submerged Portion (50%) | 9.5 ft | 10.86 |
| Foil Chord | 10 ft | 11.43 |
| Foil Width | 3 ft | 3.43 |
| RIM Drive Thruster Diameter | 1.5 ft | 1.71 |
| Dinghy Length | 14 ft | 16.0 |
| Rear Deck Width (each side) | 5 ft | 5.71 |
| Stabilizer Wingspan | 12 ft | 13.71 |
| Stabilizer Chord | 1.5 ft | 1.71 |
| Stabilizer Body Length | 6 ft | 6.86 |
| Stabilizer Elevator Span | 2 ft | 2.29 |
| Stabilizer Elevator Chord | 0.5 ft | 0.57 |
Important: The full-scale weight was not provided. Under Froude scaling, weight (and displacement) scales with λ³.
Scaling factor for weight: (1/10.5)³ ≈ 0.000863
Model target weight (lbs) = 0.000863 × Full-scale weight (lbs)
To achieve proper buoyancy and waterline, the model should displace exactly 0.0863% of the full-scale displacement. Weigh the completed model and add ballast as needed to match the scaled displacement.
| Full Scale Wave Height | Model Wave Height |
|---|---|
| 3 ft | 3.43 inches |
| 5 ft | 5.71 inches |
| 8 ft | 9.14 inches |
Position the model in different parts of Sandy Hill Bay to encounter these wave heights. Use your marked wooden pole to verify actual wave heights during testing.
Top Recommendation: Phyphox
Alternative Options:
Mount the phone securely on the model (or use the GoPro's built-in sensors) and start logging before each test run.
Key Principle: Under Froude scaling, accelerations are preserved (scale factor = 1). Therefore, acceleration values measured on the model directly correspond to full-scale accelerations.
Assuming a typical coefficient of friction of 0.25–0.4 for dishes on a table:
To represent a 6-foot-tall person at 1:10.5 scale:
Approximately 6.86 inches tall
7-inch action figures or dolls work well. Place several at different locations (deck, inside living area) for visual scale reference in video.
To simulate deep-water wave conditions (avoiding shallow-water steepening and bottom effects):
Note: True deep-water conditions require water depth greater than half the wavelength. Since wave periods in the bay are fixed, choose the deepest available area in Sandy Hill Bay for the most accurate simulation.