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MAST POSITION

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Geoff G View Drop Down
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Joined: 03 Jan 2010
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Post Options Post Options   Quote Geoff G Quote  Post ReplyReply Direct Link To This Post Topic: MAST POSITION
    Posted: 03 Jan 2010 at 8:05pm
I have an original mast which has been lifted out for this winter.  For the past year it has been stepped so that the for'd side of the mast is about level with the for'd end of the step which seems to give the mast too much of a rake.  Any views on where the foot of the mast should be positioned??Confused
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RobMilledge View Drop Down
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Post Options Post Options   Quote RobMilledge Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jan 2010 at 9:34pm
Geoff
If you want to reduce rake try shortening the forestay by winding down the bottle screw. If you don't have enough adjustment, you may have get you local rigger to shorten the forestay, but the minimum you can do this by is the length of the swage. You'll obviously need to adjust backstay and shrouds accordingly. As a result, you may have to move the mast foot back slightly to ensure the mast is roughly in the middle of the deck opening.  
Reducing rake (moving the masthead forward) will move the centre of effort of the sail plan forward and decrease weather helm upwind. It will also help with downwind performance, especially if you can ease the backstay off. Upwind, you need a tight forestay, not too much sag to leeward. You can keep the mast straight fore and aft using the lowers. Hope this helps.
Rob Milledge
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moongirl View Drop Down
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Post Options Post Options   Quote moongirl Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2010 at 7:47pm
Geoff
Rob is absolutely correct in what he says about mast adjustment. I would add that it would be worth having a look at Ian Brown's guide to tuning (Quantum Director very familiar with CO32s) I think its on the Site somewhere but cannot remember where - probably under Technical.
 
Regards
 
Colin
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Geoff G View Drop Down
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Post Options Post Options   Quote Geoff G Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jan 2010 at 7:40pm
Thank you Rob and Colin for your helpful replies.  I have a fair understanding of tuning theory, including fore and backstay adjustment.   The rigging was replaced last year, because it was old, using the old stuff as a measure for length.  She sails just fine and points, well, not too badly but I just don't remember the foot of the mast being so far forward and I wondered if, in boats with the original mast, there was a "standard" position for the mast foot, as a sort of starting point. 
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GNGILPIN View Drop Down
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Post Options Post Options   Quote GNGILPIN Quote  Post ReplyReply Direct Link To This Post Posted: 18 Feb 2010 at 8:46pm
My mast, I think, is an original ( used to be golden colour ) . I took pictures of its position  ( in situ ) a couple of weeks ago. I will e-mail these to you if you like. I think the mast foot position is pretty much in the middle of the fitted bracket. I have not adjusted either the mast position in the bracket or the position of the bracket on the saloon floor.
I suppose we should assume a degree of uniformity between boats with the position of the bracket.....mine is slightly at an angle relative to the midline of the vessel.
 
George Gilpin
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