Contessa 25

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° 0.47 0.71 0.78 0.89 0.96 0.99 1.03
40° 2.83 4.78 5.44 6.20 6.69 6.93 7.18
50° 3.36 5.50 5.98 6.71 7.20 7.48 7.76
60° 3.53 5.77 6.14 6.89 7.42 7.70 7.99
70° 3.60 5.89 6.25 7.07 7.66 7.95 8.25
80° 3.66 6.00 6.35 7.20 7.83 8.14 8.44
90° 3.69 6.09 6.43 7.29 7.92 8.23 8.54
100° 3.70 6.13 6.56 7.48 8.16 8.48 8.79
110° 3.72 6.18 6.70 7.68 8.39 8.70 9.03
120° 3.59 6.03 6.64 7.72 8.54 8.86 9.19
130° 3.38 5.72 6.47 7.56 8.37 8.70 9.03
140° 3.12 5.36 6.24 7.32 8.09 8.41 8.72
150° 2.83 4.94 5.91 6.94 7.66 7.95 8.25
160° 2.41 4.36 5.55 6.71 7.54 7.83 8.13
170° 2.17 3.97 5.29 6.47 7.30 7.58 7.86
180° 1.98 3.77 5.33 6.51 7.30 7.58 7.86