[Public-List] Rigging

[Meinhold, Michael J.]

Here is a table with the Luff Perpendicular worked out for each of the
jibs shown in the A30 Sail Plan. The Chesapeake Bay One Design rules
specify these numbers as max dimensions for the Working Jib and the #1,
but say only that the #2 must  be smaller in every dimension than the
#1.  The J shown in the Sail Plan is 10 feet 5 inches.

          Luff   Foot Leech   LP    LP/J%
Working  30.00  10.25 25.75  8.52  0.82
#2       32.00  15.00 30.25 14.06  1.35
#1       34.00  19.00 33.50 18.09  1.74 

LP can be found directly from the three sides of a triangle as :
LP = sqrt ( foot^2 - ( (leech^2-foot^2-luff^2)/(2*luff) )^2 )

My wife greatly prefers the #2 and though she hasn't seen it in action,
my new Working Jib will be her favorite.

Mike
Rinn Duin #272
-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Michael
Grosh
Sent: Tuesday, July 20, 2010 10:54 PM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Rigging

If I remember correctly, some sailmaker at a seminar had worked out the
largest genoa ratio on the Alberg (by class rules) is 163%.
I had a full luff, raised foot #2 (I forget the parameter I used for J,
but fairly big, as I also have a working jib) made for use as a primary
cruising sail, and it works great for that. The wife tends to go into
conniptions, just on principle, I think, whenever she sees the #1 come
out.

MichaelGrosh
#220

On Jul 20, 2010 1:35 PM, <jirving104 at aol.com> wrote:


When I bought my Alberg 30, it had a small self tending jib only.  I
assume it has always been that way.  I now sail with loose footed jibs,
80%, 140% and 170%.  I didn't change the rig any.  I'm curious if A-30's
with the small self tending jibs had smaller stays.
John Irving

Scotch Bonnet, #634




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