Loss of upwind performance

Racing Tools & Techniques

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Postby Guest » Mon May 14, 2007 1:17 pm

lately have lost pointing and speed upwind. Mainsail is in 4th season. I am slower upwind in real time than boats with much much higher phrf rating.
Besides a new mainsail, any suggestions.
Mainsail still has some stiffness from resin

[Posted by: Ken Lury
]
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Postby thomas_arj » Mon May 14, 2007 5:51 pm

Twist and mast tuning are my first thoughts.
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Postby Guest » Mon May 14, 2007 7:51 pm

Ken, agree with above, but I just got a new set of sails and tuned to the maker's guide...what a difference. If you're serious about sails, you should go with new main and Jib set. Only way to ensure they'll work together properly.
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Postby derek_jackson » Mon May 14, 2007 8:51 pm

What wind range are you suffering in?
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Postby Guest » Mon May 14, 2007 9:22 pm

so far all the races have been in 5-10kts.
my jib is two years old;UK kevlar tapedrive
The main is UK 4 years old, but still has some resin and is not soft.

[Posted by: Ken Lury
]
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Postby Guest » Tue May 22, 2007 5:26 pm

my experience is UK mainsail design seems simply too flat for lighter conditions ; mine has more than 5 years on, and still is very flat at 13-14% depth (at top batten) ; on the other hand my new north main is much deeper (15-16%) and very much faster at in the light...

[Posted by: massimo
]
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Postby derek_jackson » Tue May 22, 2007 6:27 pm

I find on our UK mains in the lighter stuff we have our best speed if we ease the outhaul a little more than what one would normally ease it. Second... all I ever hear is twist twist twist... but after a ton of playing around last year I don't believe it. I think the tendancy is to twist the top off too much and take the top of the sail out of the breeze completely. I found that it is better to have the traveller only 4 to 6 inches to windward and sheet in till the boom is almost on center with the top batten just barely to leward. Then I like to set the vang just tight enough so the boom isn't bouncing up and down. It all might sound a bit unconventional... but it seems to be good from about 4-8 knots anyway.
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Postby Guest » Fri May 25, 2007 11:18 am

I appreciate the feedback. I have up until now been a big believer in "twist" which has worked until recently. I was out yesterday and had the traveler just a bit above midline. Also moved the jib cars aft. Better performance, but wind was ~12kts.
This weekend is supposed to be lighter so I will see how it goes.
I sail ~40 days a year so the sails may just be shot.

[Posted by: Ken Lury
]
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