Fxwg80hd wrote:mastreb wrote: Mainsail not going all the way is just wasted mast
Is this the gap from the top you are talking about? That is as high as I can raise my sail. Pretty sure the rigging would not allow proper sail tension if the sail went much closer to the top.

Hello,
I'm a sales rep for Hyde Sails. There's a very good reason for "wasting" a couple of inches at the top of the mast.
It's required by the geometry of the mainsail halyard, the headboard, and the back side of the mast. In a nut shell, the halyard has to be almost parallel to the mast, or else the mainsail binds going up and down.
Typically, with simple masthead fittings, you need to leave a couple of inches above the head of the mainsail at the top of the mast . That ensures that the halyard is almost parallel to the mast above the headboard.
If you pull the head of the mainsail higher, the halyard will be at too much of angle to the mast, somewhere in excess of 10 or 15 degrees. That causes the headboard to compress the slides towards the mast. The slides would bind and it would be very hard to hoist the mainsail.
Hope this clarifies,
Judy B