Top triangle: 70 ft sides, 35 ft back, ~68 ft long
Living area: ~1,186 sq ft, 7 ft truss height
Triangle area: ~1,186 sq ft
3 Foil legs: NACA 0030, 10 ft chord, 3 ft max thickness, 19 ft long
Submerged depth: 9.5 ft per leg (50 %)
Leg bottom slope: 5° (front 10.5 in higher than back)
Rim-drive thrusters: 6 × 1.5 ft diameter
Stabilizer wings: 3 × (12 ft span, 1.5 ft chord) + elevator
Estimated displacement: ~38,000 lbs (17.2 tonnes)
Windage area (frontal): ~200 sq ft, Cd ≈ 1.2
Two winches sit at the left and right rear corners of the triangle, 35 ft apart. Each winch has a rope running aft to the drogue. When both ropes are equal length the drogue sits on the vessel's centerline. Differential winching shifts the drogue laterally, changing the direction of the pull force.
For both ropes to reach the same point, the difference in rope lengths must be less than the 35 ft between winches. With main lines of ~180–200 ft, a length difference of 20–35 ft produces a drogue offset of 30–40° off the vessel centerline.
| Left Rope | Right Rope | Difference | Drogue Offset Angle | Approx. Lateral Pull Fraction |
|---|---|---|---|---|
| 200 ft | 200 ft | 0 ft | 0° (centered) | 0 % |
| 190 ft | 200 ft | 10 ft | ~10° | ~17 % |
| 180 ft |