http://www.hobiecat.com/experiance/learn.html
FLYING A HULL
When sailing in strong winds the Hobie will normaly heel a little. If you
don't hike out enough to provide sufficient counter weight the windward hull
will lift out of the water. Once the windward hull is clear of the water, we
call this 'flying a hull'. A beginer should try to sail the boat with less
than 8* heel, any more than that and you will be flying your hull which may
lead to a capsize.