Re: [Amel Yacht Owners] 2nd Forestay on Super Maramu
Danny and Yvonne SIMMS
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A furling headsail, if it is to be used partly furled must have a properly shaped and constructed foam pad at the luff. Many sail makers use a rope sewn in just behind the luff as an alternative. It is not effective because it is not shaped to take up the extra draft in the middle of the sail.
That's that one dealt with. If you have a sail with the afore descried foam pad at the luff furling does no damage as the sails shape is maintained. Without the foam pad the sails shape would be terrible and damage would be done.
Next point. What wind strength is the sail maker envisioning when designing this huge sail. I would guess 15 knots true and they use cloth of a weight matching this with some margin for error. I told the sailmaker I could be using the sail reefed in 40 knots true and that they were to use a cloth weighted for that. As I said in my previous they ignored me and used a lighter cloth and rope on the luff and had to replace the sail.
As I said in my previous, if I have a long period of on the wind sailing in strong wind I change down to my 90%. The ability to sail furled is to allow rapid change as the weather does what it does best...change
When I raced yachts I always told sailmaker to use a heavier/stronger stretch resistant cloth on all my sails as I reasoned that the short term benefit of a lighter cloth would soon be lost as the sail distorted with age. Not being a hot shot that had sponsors replacing my sails each regatta I wanted years of life not months.
This certainly applies to my cruising now. I note many of the SM I see with their head-sails furled have a much smaller bundle than mine. I guess they have a much lighter cloth than mine.
I think this answers your question as to how using the sail partly furled would be related to loss of sail shape over time. If the above is followed, very little to none.
SM 299 Ocean Pearl