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Forums28
Topics3,984
Posts19,069
Members1,019
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Most Online238 Feb 9th, 2024
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Re: prebend
#2002
09/23/08 11:38 PM
09/23/08 11:38 PM
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Joined: Apr 2007
Posts: 493 Chicago, Il. USA
D. Bartley
Governor at Large
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Governor at Large
Joined: Apr 2007
Posts: 493
Chicago, Il. USA
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Originally posted by Steve Buzbee: every 1/2" back in mast butt position pushes the top of the untensioned rig forward about two feet
Are you sure about that Steve? Is the fulcrum not the headstay attachment up at the hounds?
Dennis Bartley Planxty, s/n 23994 hull 205
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Re: prebend
#2005
09/25/08 08:07 AM
09/25/08 08:07 AM
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Joined: May 2007
Posts: 2,669 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,669
Portsmouth, RI
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Originally posted by MangoMadnesss: ...
Can someone please elaborate on this.I thought I saw pics on this topic on this board somewhere. I want to check mine, as I'm trying to re-tune her now that the deck rebuild is almost complete. Rob - Sorry I don't have any pics of this. When you pull your mast you'll see an oval that is screwed to the deck. The mast extrusion fits snug over this oval and prevents the mast base from moving. You should be able draw a line 1 inch back from the forward edge of the molded step the mast sits on. Measure the thickness of the mast extrusion and draw another line behind it. This is where the front of the oval that is screwed to the deck should be positioned. Once everything is reassembled, the distance from the forward edge of the mast to the forward edge of the molded step should be 1 inch for best class legal rig tuning.
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Re: prebend
#2007
09/25/08 12:07 PM
09/25/08 12:07 PM
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Joined: Oct 2008
Posts: 148 Iowa City IA
Phantom364
OP
Senior Member
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OP
Senior Member
Joined: Oct 2008
Posts: 148
Iowa City IA
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Originally posted by B Johansson: Letting out the headstay 3/4" would increase the pre bend in the lower section. It seems your backstay is too short and holding back the tip of the mast - On FW we had to add a 3" toggle to get enough slack - we always keep the sag in the backstay 3-4" and very rarely tension it below 15 knots. With that much sag in the backstay don't you have trouble with the top main batten foully on the backstay? I all ready have that problem in light air. I'll have to measure the backstay when I winterize, but it seem a lot of the bend was in the top 1/3 of the mast. Easing the headstay reduced that bend.
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Re: prebend
#2010
09/25/08 09:19 PM
09/25/08 09:19 PM
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Joined: May 2007
Posts: 2,669 Portsmouth, RI
Rhapsody #348
Past J/30 Class President
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Past J/30 Class President
Joined: May 2007
Posts: 2,669
Portsmouth, RI
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Originally posted by MangoMadnesss: I think my mast step is too far back.
Yup!
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