Nick Turney of North Sails gives you some tips on mast butt placement,
before you can step your mast you need to make sure that your mast butt
is in the correct positions. Your mast butt controls your rake; the
angle of the mast in the boat controls the position of the center of
effort over the center of resistance. Too much rake aft, or the
shortening the distance between the top of the mast and the back of the
boat will generate weather help while too little mast rake, or moving
the mast tip forward will generate lee helm.
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