Improvised Lifeboat

Polar plot showing boat speed over water (in knots) for various true wind speeds and angles from true wind direction
Boat wind response polar plot
Table of values for boat speed over water (in knots, to two decimal places) for various true wind speeds and angles from true wind direction
5 kt 10 kt 15 kt 20 kt 25 kt 30 kt 35 kt
30° 0.00 0.00 0.00 0.00 0.00 0.00 0.00
40° 0.34 0.35 0.35 0.36 0.36 0.37 0.38
50° 0.53 0.61 0.60 0.63 0.64 0.66 0.68
60° 0.73 0.96 0.98 1.05 1.08 1.12 1.16
70° 0.99 1.23 1.26 1.37 1.44 1.49 1.55
80° 1.17 1.51 1.64 1.84 1.95 2.00 2.06
90° 1.31 1.71 1.94 2.21 2.39 2.48 2.58
100° 1.44 1.93 2.31 2.66 2.88 3.03 3.17
110° 1.63 2.23 2.76 3.14 3.39 3.68 3.87
120° 1.66 2.44 3.13 3.58 3.89 4.28 4.51
130° 1.51 2.49 3.34 3.88 4.23 4.55 4.79
140° 1.34 2.31 3.18 3.91 4.47 4.83 5.08
150° 1.17 2.04 2.87 3.51 4.04 4.56 4.89
160° 1.00 1.86 2.64 3.24 3.75 4.30 4.66
170° 0.86 1.62 2.34 2.95 3.51 4.08 4.47
180° 0.72 1.43 2.08 2.66 3.21 3.79 4.23



Reduction of speed through water from effect of waves (when enabled for race) for various wave heights
Wave Height Speed Reduction
0.25 m 0.1%
0.50 m 0.5%
1 m 2.0%
2 m 7.7%
3 m 16.5%
4 m 27.4%
6 m 51.3%
8 m 72.2%
12 m 94.4%
16 m 99.4%
24 m 100.0%