How's your halyard?
How's the end of your halyard? I.e., is there an eye splice and shackle on the end, allowing the halyard to go all the way to the masthead OR is the a stopper knot or other large blocking device near the end of the halyard that would prevent it from going all the way to the top of the masthead? Such a "blocking device" would, then, also prevent your mainsail from being fully hoisted.Alternatively, is there some stopper or pin in the slot of your mast (where the boom end rides) that is stopping the boom from going up higher with the sail when hoisted?Are you sure you're using the main halyard for the main and not the jib halyard for the main and the main halyard for the jib? Doing this would cause the jib halyard to be wrapped or twisted around the head of the mast, thereby shortening the maximum hoist of the mainsail.Try this. Take your mainsail off the boat and lay it out full length on the ground. Use a 100' tape measure and measure the distance from head attachment of the mainsail to the tack attachment (where the boom meets the mast on the sail). Now, using the same tape, hook the end securely into the end of your main halyard (tape it if it will not hook securely--you don't want to lose it at the top of the mast)and hoist the main halyard as high as it will go. Note the measurment where the tape hits the tack fitting on your boom (where the boom connects to the mast, where the mainsail would attach). Which measurement is greater? The second one (of the halyard length) should be greater than the first one (of the sail). If it's not, that's part of your problem. Maybe the sail is too big for your boat. OR maybe your halyard is still being obstructed at the top somehow. If the halyard length is longer than the luff of your mainsail (i.e., the measurement you made of the sail on the ground), then your sail is probably the right size,as is your halyard--you just need to hoist it higher, using more tension on the halyard. It is also possible that your halyard may be stretching too much. Is it wire or rope? If it's rope, how old is it and/or what type of line is it? It might simply be that your halyard is too old and/or the wrong type of line (i.e., that stretches too much) which would explain why you can't tension the halyard sufficiently. Get someone else that knows something about sailboat line to look at it if your not sure.Good luck.Richs/v TIME BANDIT, OD22