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leach control with a sprit boom

Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=11414
Printed Date: 14 Jul 25 at 6:39am
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Topic: leach control with a sprit boom
Posted By: Reuben T
Subject: leach control with a sprit boom
Date Posted: 31 Mar 14 at 10:43pm
The boat I am currently building is designed to have a sprit boom on a standing lug rig(see diagram) I know this probably isn't the specialism of people on this forum but I wondered if any of you could work out  a simple system to allow leach control as it would drive me mad sailing something that I couldn't properly control the sail shape on.

My thoughts so far are:
  • The sheeting position can't be altered to get different sheeting angles.
  • Adjusting the angle of the yard will alter luff tension as well as the leach tension





Replies:
Posted By: JimC
Date Posted: 01 Apr 14 at 1:39am
Think you're building the wrong boat then mate... But if you junked the lug sail in favour of a gaff rig main of approximately the same shape you'd have a rig you could have a reasonable degree of control over. Give it a push kicker and you'd have just as much room round the mast.

The point of a lug sail like that isn't efficiency but the ability to wave a largish lump of rag in the air with a minimum of strings.


Posted By: transient
Date Posted: 01 Apr 14 at 2:21am
Indeed..... Which is why old fishing boats used lugs....they had better things to do than pull endless pieces of string.


Posted By: Rupert
Date Posted: 01 Apr 14 at 8:39am
Your downhaul will control luff tension, and creating a system to change the angle of the sprit will control (to a small degree) leech tension.

However, as Jim and T have said, this is not a fine control sail. The gaff itself helps on the leech tension, though - you have no roach to control.


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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686



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