Based on the physics of large, slow-turning propellers (like the ShinMaywa mixer) operating in moving water, here is the analysis and the requested table.
### The Physics
When a vessel moves forward, the water enters the propeller with a specific velocity (the vessel speed). This changes the "angle of attack" of the water hitting the blades.
1. **Thrust:** As speed increases, the angle of attack decreases, significantly reducing the thrust the propeller can generate. For a fixed-pitch propeller optimized for low speed, thrust drops off approximately linearly as speed approaches the "zero-thrust" speed (pitch speed).
2. **Power:** The power required to spin the propeller drops because the water is already moving past the blades; the propeller does not have to work as hard to accelerate the water. The motor "unloads" as speed increases.
**Note on your Seastead Speed:**
Based on your rough weight (30,000 lbs) and the high drag of the column structure, a single one of these units (producing ~1,300 lbs of thrust at 1.5 MPH) would likely struggle to push the seastead faster than **1.0 to 1.5 MPH**. At those speeds, the drag of the water against your columns will roughly equal the available thrust.
### Performance Estimates
Here is the HTML table with the estimated performance values.
```html
Seastead Propulsion Analysis
Submersible Mixer Propulsion Performance
Estimated performance for a ShinMaywa-style mixer (2.5m prop) used as propulsion on a high-drag seastead.
| Vessel Speed (MPH) |
Estimated Thrust (Newtons) |
Estimated Thrust (lbs) |
Power Draw (kW) |
| 0.0 |
3200 |
719 |
3.20 |
| 0.5 |
2600 |
584 |
3.00 |
| 1.0 |
1900 |
427 |
2.70 |
| 1.5 |
1300 |
292 |
2.30 |
Note: Thrust drops significantly as speed increases due to the fixed pitch of the blades.
Power draw decreases as the vessel moves faster because the incoming water flow reduces the load on the motor (unloading effect).
At approximately 2.5 MPH, this specific propeller would generate near-zero thrust.
```