Page 204 - RRS 2017 - 2020 (Reprint)

TIME AND SPEED CHARTS
Time in seconds to advance 1 length

Boat Length of Yacht in Metres
Speed
Knots 4 5 6 7 8 9 10
1 7.8 9.7 11.7 13.6 15.5 17.5 19.4
2 3.9 4.9 5.8 6.8 7.8 8.7 9.7
3 2.6 3.2 3.9 4.5 5.2 5.8 6.5
4 1.9 2.4 2.9 3.4 3.9 4.4 4.9
5 1.6 1.9 2.3 2.7 3.1 3.5 3.9
6 1.3 1.6 1.9 2.3 2.6 2.9 3.2
7 1.1 1.4 1.7 1.9 2.2 2.5 2.8
8 1.0 1.2 1.5 1.7 1.9 2.2 2.4
9 0.9 1.1 1.3 1.5 1.7 1.9 2.2
10 0.8 1.0 1.2 1.4 1.6 1.7 1.9
1 knot = 0.515 m/sec = 1.666ft/sec
Boat velocities for given wind speeds
This table gives approximations only. Velocities are for non-planing boats
that are reaching or running. For beating, velocities will be lower and
multiplying by 0.8 will yield an approximate result.
Wind Waterline length of boat in metres
3 4 5 6 7 8 9
Kn Bft Kn m/sec Kn m/sec Kn m/sec Kn m/sec Kn m/sec Kn m/sec Kn m/sec
1 1 0.2 0.1 0.2 0.1 0.2 0.1 0.2 0.1 0.3 0.1 0.3 0.1 0.4 0.2
2 0.4 0.2 0.5 0.2 0.4 0.2 0.4 0.2 0.5 0.3 0.7 0.3 0.8 0.4
3 0.7 0.4 0.6 0.3 0.7 0.4 0.7 0.3 0.8 0.4 1.0 0.5 1.2 0.6
4 2 0.9 0.5 0.9 0.5 0.9 0.5 0.9 0.5 1.1 0.6 1.3 0.7 1.6 0.8
5 1.1 0.6 1.1 0.6 1.1 0.6 1.1 0.6 1.4 0.7 1.7 0.9 2.0 1.0
6 1.4 0.7 1.4 0.7 1.4 0.7 1.4 0.7 1.7 0.9 2.1 1.1 2.4 1.3
7 3 1.6 0.8 1.6 0.8 1.6 0.8 1.6 0.8 2.0 1.0 2.4 1.2 2.8 1.5
11 4 2.5 1.3 2.6 1.3 2.6 1.3 2.6 1.3 3.1 1.6 3.8 2.0 4.5 2.3
17 5 4.0 2.0 3.9 2.0 4.0 2.1 4.1 2.1 4.9 2.5 5.9 3.0 6.9 3.6
22 6 5.2 2.7 5.1 2.6 5.1 2.6 5.3 2.7 6.3 3.2 7.7 4.0 9.0 4.7
1 metre = 3.281 feet

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