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Proposed National Keelboat Rating System – How it Works, Part 2

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Proposed National Keelboat Rating System – How it Works, Part 2

Part | 1 | 2 | 3 | 4 | 5 |

We ran the basic outline of this last week (see below on this page) and here is a bit more detail.

It is based on similar data extraction as used in IRC or ORC International type ratings. The main difference is in the finer points.

The generic method of calculating yacht speed is hull standing wave for immersed hull upwind and downwind, times a power factor. Upwind, there is little variance between the hull standing wave speeds and actual speed on water as boat is not able to climb over standing wave.

Downwind is where the fun begins. All rating systems attempt to put a power factor onto standing wave to determine how fast the yacht will go. The generic method for speed is standing wave x power factor x constant to get speed in knots.