Wharram Builders and Friends

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Comment by Stephan on January 9, 2013 at 3:38pm

Beautiful :-) Let us know your feedback about that sail plan. Enjoy :-)

Comment by Brendon & Aleisa on January 9, 2013 at 4:32pm

couple of notes about our sail, we're calling (for lack of knowing any other) the vertical spar the "gaff" and the horizontal the "boom".  The entire rig pivots around the mast so we dont believe it will be necessary to head up for sail raising and lowering.  The rig is very inexpensive to build, sail is cheap and easy to build  even for homemade (ours by Sailrite 1700.00).  Still have long way to go learning but have to hurry leaving for Panama in May

Comment by wakataitea on January 10, 2013 at 4:08am

hallo stephan,

we are using this kind of sail now since 20000nm offshore sailing. check out our  www.wharramsailing.com and the pictures posted on this page.

 i believe i know quite a pit about this  crab claw rig.

there are 3 thinks on your sail, which i thing they are wrong.

-first, the shape on the back of the sail (leech). it should have a curve and not strait. this is very important for the performance and to avoid that the leech starts flopping in the wind when you sail upwind or starts pending to leeward when sailing down wind...we have on a lengths of 10m a cut out bow (height/negative) of 0,6m in it. i hope you understand what i mean.

the same should be on the gaff and the boom side. we have on the length of 10.5m there a bow with a height (positive) of 0.2m in the middle.

-second the reef points.

we have a reef on 15 degree and 30degree from the bottom (boom). the full sail has a angle of 60 degree. with the first reef, the sail has 45 degree and works very well. with the second reef it has only 30 degree and it gets asymmetrically. it does not perform so well any more but because there is a lot of wind when using it it does not matter so much...

we experience, that even in less wind, the sail with one reef and a angle of 4 degree works great.

i believe your first reef is to high and with the second reef, the sail will not have any shape any more.

the third and last... ;) your gaff is to close to the mast. you have to avoid that it is in a 90 degree angle to the wind... otherwise it will work like a bermuda sail...

the point where you attach the mainsheet is important too. it should be in the middle of the boom that you can pull the sail flat. on the end of the boom, it will pull only the leech and in strong winds, the boom will break.... no support. do it like on the gaff...

 ok. i hope you have fun with the sail. please post some more pictures...

check out the sail from hans klaar ontong java... too

cheers hans

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