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Light wind trim

Printed From: Yachts and Yachting Online
Category: Multihulls
Forum Name: Technique
Forum Discription: 'How to' section for multihull questions and answers
Printed Date: 28 May 20 at 2:36am
Software Version: Web Wiz Forums 9.665y -

Topic: Light wind trim
Posted By: Wee Man
Subject: Light wind trim
Date Posted: 18 Oct 10 at 1:08pm
Having just come back from Grafham.
On the light wind day I noticed some crews lying along the leeward hull forward of the beam, while some others lie along the windward hull. Which is fastest? and why?

Posted By: mattmd
Date Posted: 18 Oct 10 at 5:11pm
When I sailed F18, On lightwind days id crew, by sitting on the leeward side, 
this is because it would lift the windward hull and reduce wetted surface area, and consiquently go faster. But just getting your weight forward helps speed as it stop the transom from digging in. But I personally would sit on the leeward side, however be carefully if your sailing somewhere gusty, be ready to run over the other side if it heels massively, gain speed from gusts do not pinch.

Hope this helps 

Matt MD
Contender GBR-620

Posted By: Black no sugar
Date Posted: 18 Oct 10 at 7:41pm

It's only a Topper tale so feel free to ignore.

During the summer, we were two Toppers side by side on a broad reach / run in light wind. We were both on a starboard tack with me on the outside, trying to get faster. We sailed most of that leg at the same speed. Thinking I'd had enough, I assumed the monkey position (holding on to the daggerboard, leaning to starboard, as good instructors teach) and I was surprised to see how much quicker the boat went. I pulled away from the other boat really quickly, considering the wind strength.
In your question, you don't mention the point of sail so this answer is probably... pointless! Tongue 

------------- - Lancing SC

Posted By: zailor
Date Posted: 18 Oct 10 at 8:09pm
so was that windward or leeward heel?^

Posted By: Wee Man
Date Posted: 18 Oct 10 at 8:52pm
Mainly noticed the different style upwind, I was wondering if it has anything to do with the different bows on the newer boats (Wild Cat, Edge, Infusion).

Posted By: kfz
Date Posted: 01 Dec 10 at 9:35am
Depends on how light the wind is.  Very very light winds where your struggling to fill the main I tend to get the crew on the leeward side and get the boat healing just a little, Its holds the boom out and helps the sail get some sort of shape. Vital theres virtually no kicker, though I have experimented with using a little outhaul lately.

Once you have enough wind to hold the main shape then whatever side holds the boat dead level. Let the outhaul off and get the slack out the kicker. 

Not sure if this is right or not.

GP14 Fleet Captain
Liverpool Sailing Club - Liverpool SC

Posted By: alstorer
Date Posted: 01 Dec 10 at 9:37am
kfz- this is the multihull section!


Posted By: kfz
Date Posted: 01 Dec 10 at 10:02am

GP14 Fleet Captain
Liverpool Sailing Club - Liverpool SC

Posted By: snowleopard
Date Posted: 15 Mar 18 at 1:59pm
Regardless of the number of hulls, at very low speeds, skin friction is more significant than waterline length or hull form so altering the trim of the boat to reduce wetted surface does help speed. In cats, there is less opportunity than monos but moving forward to lift the stern clear of the water does help. At what speed you stop doing that is a matter for experimentation.

I remember competitive Laser sailors sitting forward of the mast to lift 3 ft or more of the stern clear of the water in ghosting conditions.

One hull good, two hulls better.

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