Rake is how far the mast is swept backwards from vertical. As the wind increases you will need to rake the mast progressively more to keep the boat balanced.

You can measure rake a number of ways. One common way is by measuring the distance from the top of the mast to the keel band at the stern. SEE PHOTOS BELOW

Required Rake range using the above method is:

Fully Upright –  7850mm (7.85m) or 25ft 8in

Fully raked back –  7650mm (7.65m) or 25ft