On Wed, 20 May 2009 01:30:11 -0500, cavelamb
wrote:

Ok, the big argument is this...

Does partial unrolling of a roller furling head sail cause damage to the sail?
(in terms of shape and stretch)

Yea or Nay?

Nay.

When partially furled, the forces on the sail are much lower than when
let out.

Some sailmakers make head sails specifically designed to have a better
shape when partially rolled up, but it haslittle or nothing to do with
any potential for actual damage.

Kappa Sails in Westbrook, CT makes a really nice 135% that rolls to a
100%, and maintains good shape. It is made with two different weight
sailcloths, in addition to the careful design.

Most "common" headsails, when partialled furled, have a very fat
leading edge that kills air flow, and a poorly shaped exposed area.
They still provide "some" power, but not as much as you might like.

wrote:
On Wed, 20 May 2009 01:30:11 -0500, cavelamb
wrote:

Ok, the big argument is this...

Does partial unrolling of a roller furling head sail cause damage to the sail?
(in terms of shape and stretch)

Yea or Nay?

Nay.

When partially furled, the forces on the sail are much lower than when
let out.

Some sailmakers make head sails specifically designed to have a better
shape when partially rolled up, but it haslittle or nothing to do with
any potential for actual damage.

Kappa Sails in Westbrook, CT makes a really nice 135% that rolls to a
100%, and maintains good shape. It is made with two different weight
sailcloths, in addition to the careful design.

Most "common" headsails, when partialled furled, have a very fat
leading edge that kills air flow, and a poorly shaped exposed area.
They still provide "some" power, but not as much as you might like.


Yeah. That's what might be referred to as a real roller reefer.

"cavelamb" wrote in message
...
wrote:
On Wed, 20 May 2009 01:30:11 -0500, cavelamb
wrote:

Ok, the big argument is this...

Does partial unrolling of a roller furling head sail cause damage to the
sail?
(in terms of shape and stretch)

Yea or Nay?

Nay. When partially furled, the forces on the sail are much lower than
when
let out.

Some sailmakers make head sails specifically designed to have a better
shape when partially rolled up, but it haslittle or nothing to do with
any potential for actual damage.

Kappa Sails in Westbrook, CT makes a really nice 135% that rolls to a
100%, and maintains good shape. It is made with two different weight
sailcloths, in addition to the careful design.

Most "common" headsails, when partialled furled, have a very fat
leading edge that kills air flow, and a poorly shaped exposed area.
They still provide "some" power, but not as much as you might like.


Yeah. That's what might be referred to as a real roller reefer.

The foresail I use all the time is a 130% Mack sail which has padding built
in along the luff which makes it roll very smoothly when partially reefed.
My hobby room contains a load of Mylar racing sails which I never use since
I got racing out of my system while I was still dinghy sailing. They all fit
the grooves in my furling gear but I bet they would not like to be used
partially furled.