[MHml] Optimal jib sheeting angle

[Alex Durrant]

Larry,

Yep, I can confirm the 6 degree angle.  It gives a slot of about 18 inches
as Gary says, and that looks extremely small.  However steer from the
leeward position on a balmy day and the wind over there is like twice what
you feel on the windward side.  The slot really works with a rotating mast
which keeps the wind attached at the front of the mainsail, so it does not
need to be really wide.

The track on Dewie (Zazen's sister ship) which you see in that photo when we
first launched, is a bit over 3 metres, and even walking the sheet out to
the end of it, it is not enough.  I use a Barber hauler to keep the sail
shape when she is out wide.  Or pull out a screacher from a roller furler,
hehehe.

Don't forget with the blade jibs on these boats, there is no overlap on the
main whatever.  Also if you are having a jib made, tell the sailmaker of
your sheeting angle so he can cut it right.  Dewie did point up a little
closer and held the jib position more easily when the sails were new, so
sail shape needs to be right to keep this angle.

Cheers,

Alex

Alex Durrant
 
Phone     +62 21 799 2704
HP        +62 811 55 3330
Email     ajsd at iname.com
Skype     ajsd at iname.com
 

-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Larry Forgy
Sent: 17 June 2008 06:33
To: Informed discussion of multihull issues
Subject: Re: [MHml] Optimal jib sheeting angle

Gary,

Wow, 6 degrees?  With my 14 foot foretriangle, that would put the jib less
than 18 inches from the centerline.  With the mast rotated, the slot would
probably be about one foot wide.  How large is the slot between the main and
jib on Zazen?

Good suggestion about beach cat style tracks to widen the sheeting angle.
The geometry won't quite work for me, but I am hoping to do the same thing
with a pair of barber haulers.

Thanks,
Larry Forgy