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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Tiller/ Rudder Lee helm instead of Weather helm		  New Topic  Topic Locked
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existentialsailor
Master Marine Consultant

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USA
1180 Posts
Initially Posted - 07/31/2005 :  19:56:29  Show Profile
My Capri has a slight lee helm, when it is known that the Capri's usually have a slight weather helm. We've tuned and straightened the mast and rigging. The rudder is aligned, the tiller is aligned. What else should I be checking to sort this out?
Rick
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Douglas
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1595 Posts
Response Posted - 07/31/2005 :  20:03:44  Show Profile  Visit Douglas's Homepage
Perhaps the mast should not be streight but slightly tilted aft.
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existentialsailor
Master Marine Consultant

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1180 Posts
Response Posted - 07/31/2005 :  20:17:20  Show Profile
Sorry, when I said straighten the mast I meant equalized on port and starboard not forward or aft. Adjusting the back saty for upwind or down wind doesn't affect the helm.
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Oscar
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USA
2030 Posts
Response Posted - 07/31/2005 :  22:21:27  Show Profile  Visit Oscar's Homepage
What was meant was to give the mast some rake......ie tilt it aft. Don't know for your Capri, but if I recall correctly the 250 called for the main halyard to "dangle" about 4 inches aft of the base of the mast. It would be a good place to start.
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existentialsailor
Master Marine Consultant

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1180 Posts
Response Posted - 08/01/2005 :  08:09:43  Show Profile
Thanks Oscar, I do give it quite a bit of rake when sailing upwind, adjusting with the backstay, or am I still missing the point?
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dhunt
1st Mate

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USA
83 Posts
Response Posted - 08/01/2005 :  08:20:34  Show Profile
adjusting the backstay against the force to forward lowers, BENDS the mast cauing the leach of the sail to open . . . RAKE in the mast is static, adjusted with no sails flying
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existentialsailor
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1180 Posts
Response Posted - 08/01/2005 :  09:49:46  Show Profile
Thanks for the clarification, will try that out.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 08/01/2005 :  22:26:08  Show Profile
Bending the mast flattens the sail and I suspect moves its center of force (CF) slightly forward, so it won't reduce lee helm. Raking the mast aft (lengthening the forestay and shortening the backstay) moves the CF back in relation to the center of lateral resistance (CLR) that is largely due to the keel, reducing lee helm and eventually inducing weather helm. Check with some of the other Capri owners to see how their main halyard hangs if released from the sail. The adjustment you want to make is using the turnbuckles--not the adjustor--so you still have the ability to adjust the backstay to change the shape of both the main and the jib for lighter air (looser and fuller) or heavier air (tighter and flatter), and for upwind (flat) vs downwind (full). You'll probably have to loosen the forward lower shrouds a little, as well.
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Brooke Willson
Admiral

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USA
983 Posts
Response Posted - 08/02/2005 :  13:53:37  Show Profile
Respectfully, make sure your're not overlooking the obvious: if you've got too much jib up and not enough main, or if your jib is trimmed proportionally tighter than your main, you're going to get lee helm.

Brooke
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.