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Old 02-07-2013
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Re: Boom rise with reefing... How much?

Reading all this with interest.

I was having the opposite problem, when both reefed and not reefed, my boom would droop, and I could not get the main sail haylard to tension the sail using that haylard alone. I need to have the raise the head of the main sail high, then pull the Tack of the sail down with the cunningham. This would both tension the main sails Luff and lift the clew to make the boom parallel. For some reason, no matter how much tension (or fear of breaking somthing), I could not get the sail luff to tension unless I used the cunnigham. When using the cunningham I could put low tension on the main sail's haylard, but provide most tension by using cunningham. Maybe play with the cunningham and main haylard to see what it does to

Here is a question:
Why does the boom need to be parallel? I would like to modify my sail by raising the clew to boom connection up by about a foot (I have a lose foot main). This would allow the boom to clear my head, and I doubt would negatiely impact performance much. I see a lot of open 40s and 60s with angled booms like this. Pros, cons?

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Boom rise with reefing... How much?-173th_437.jpg  

Last edited by casey1999; 02-07-2013 at 05:48 PM.
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Old 02-07-2013
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Re: Boom rise with reefing... How much?

The booms need not be parallel.. there are plenty of examples of otherwise, including the majority of the ocean racers as your picture shows. In the 70s and 80s booms 'drooped' substantially as some extra unmeasured sail area was snuck in there by lengthening the leech and dropping the clews. (often an issue trying to fit a dodger onto an old IOR racer)

I think, esp for ocean sailing, there's some merit in raising the clew relatively as you reef, it can avoid tripping the boom in a wave.. for most of us coastal sailors I'm not so sure it's an issue. Having a sail with a routinely 'lifted' clew might create some extra headroom and avoid the >BOOM< of an unintended gybe on certain boats with limited boom clearance.
RichH and casey1999 like this.

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