Hi Peter,

my thoughts on adjustment of rotation on Mossie mast is that the shape of the mast does not make it critical enough to need constant adjustment, from a aerodynamic view point.. Much better to concentrate on what is going on off the boat.

To my mind major effect of rotation on Mossie mast, is on stiffness below the Hounds when you rotate more, more fore and aft load is taken by the Diamonds stiffening the Mast. Allowing you to power up the middle of the sail or less rotation flattening the sail and the entry at the same time.

Regards Gary.