1 Key Dimensions Recap
41.3 ft
Triangle Side Length
14.5 ft
Leg Length (excl. 0.5 ft cutoff)
8.5 ft
Foil Chord
2.55 ft
NACA 0030 Max Thickness (30%)
7 ft
Submerged Depth (50% of 14 ft)
1 ft
Waterline Above Foil Centerline
NACA 0030 Shape Note: A 30%-thick symmetric foil is very thick — comparable to
a submarine hull. The widest section (2.55 ft / 77.7 cm) is large enough for two side-by-side
rows of prismatic LFP cells and a central access corridor.
2 Foil Thickness Profile (NACA 0030, Chord = 8.5 ft)
The standard NACA four-digit symmetric thickness distribution:
t(x) = 5c × T × [ 0.2969√(x/c) − 0.1260(x/c) − 0.3516(x/c)² + 0.2843(x/c)³ − 0.1015(x/c)&sup4; ]
where c = 8.5 ft and T = 0.30 (30% max thickness). Results at key stations:
| Station x (ft) | x / c | Half-Thickness t (ft) | Full Thickness 2t (ft) | Full Thickness (in) | Region |
|---|---|---|---|---|---|
| 0.00 | 0.000 | 0.000 | 0.00 | 0.0 | Leading edge |
| 0.34 | 0.040 | 0.111 | 0.22 | 2.7 | Very thin |
| 0.50 | 0.059 | 0.149 | 0.30 | 3.6 | Very thin |
| 0.65 | 0.076 | 0.184 | 0.37 | 4.4 | Thin — no batteries |
| 0.85 | 0.100 | 0.266 | 0.53 | 6.4 | Min. battery width |
| 1.02 | 0.120 | 0.328 | 0.66 | 7.9 | Battery zone |
| 1.28 | 0.150 | 0.433 | 0.87 | 10.4 | Battery zone |
| 1.70 | 0.200 | 0.601 | 1.20 | 14.4 | Battery zone |
| 2.55 | 0.300 | 0.789 | 1.58 | 18.9 | MAX THICKNESS |
| 3.40 | 0.400 | 0.865 | 1.73 | 20.8 | Still wide |
| 4.25 | 0.500 | 0.868 | 1.74 | 20.8 | Still wide |
| 5.10 | 0.600 | 0.816 | 1.63 | 19.6 | Narrowing |
| 5.95 | 0.700 | 0.718 | 1.44 | 17.2 | Narrowing |
| 6.80 | 0.800 | 0.572 | 1.14 | 13.7 | Thinning |
| 7.65 | 0.900 | 0.384 | 0.77 | 9.2 | Thin |
| 8.00 | 0.941 | 0.250 | 0.50 | 6.0 | Cutoff point |
| 8.50 | 1.000 | 0.000 | 0.00 | 0.0 | Trailing edge (original) |
Trailing-edge cutoff: The last 0.5 ft of the thinnest section is removed. The foil reaches
0.50 ft thickness at x = 8.0 ft, so the practical trailing edge is at 8.0 ft, leaving a blunt 0.50 ft-wide tip.
The usable foil extends from the leading edge to ~8.0 ft.