SailNet Community - View Single Post - How Far Do You Heel...?
View Single Post
  #71  
Old 09-06-2013
Jeff_H's Avatar
Jeff_H Jeff_H is offline
Moderator
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 6,503
Thanks: 3
Thanked 81 Times in 62 Posts
Rep Power: 10
Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about Jeff_H has a spectacular aura about
Re: How Far Do You Heel...?

Quote:
Originally Posted by ScottUK View Post
Cheers Jeff.

So from what I gather the mainsail is flattened at the leading edge in the area of the mast bend and then the leech would not have as much tension thus adding more twist and spilling more wind. It has been what I thought but have heard conflicting information.

I understand moving the top of the forestay aft and down would also decrease the tension on the leech of the headsail and so induce twist. Not sure about flattening the headsail though. If the foreatay tension is tight and is moved aft through increased backstay tension wouldn't this just decrease the angle of the straight line of the forestay and not reall effect the luff. But I guess it would all depend on the initial forestay tension.
As a broad general rule, as the wind increases the headstay sags more, and this is especially true on a fractional rig where the increased headstay forces induce more mast bend. When you tighten the backstay, this increases the tension on the forestay and that reduces this sag. When you reduce sag, almost by definition, the stay itself moves forward and to windward. And this increases the distance between the leech of the sail and the stay. As that distance increases, the jib is flattened and therefore depowered.

Jeff
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies
Reply With Quote Share with Facebook