Raggies Query...

Interesting, because I found the same with my new tri radial genoa ie. it was about 10cm shorter when hoisted, despite me giving them a true luff groove length. I hadn't thought about taking it up with them because the sail is so good and powerful. It's not just the overall area, but also the efficiency of the aerofoil cut into the shape and how that is affected by the other sail dimensions used for your boat. I also suspect that the old genoa was original vintage and had stretched significantly, though logically, the luff should be pretty reinforced and unstretchy so the tension can be generated.

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Re: Confused ..... Got it now ....

They're just standard braid 'n wire thingys from Al****n s Cave.
But if they stretched out to the marks with the old sail they shouldnt be short of the marks by that amount with the new one.. Unless the luff is shorter... Just thought I could recheck the old and new with the loos gauge on the halyard!!.
Re the area diff
If there is additional luff and the thing is J+50 percent as ordered ( diff to check this) the clew should be in the same relative place to the tack. The increase in luff length (or decrease) will be all at the top and the area diff will be a long triangle from the two head points on the hypothetic luff to the clew.
The leech will of course have a hollow but I would think that as I'm looking at lost area it could be taken for all intents and purposes as a constant?

Cheers Bob E...

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This week would be a good time - Ken's got the carpet up pending next week's terpsichoria.

And bathroom scales are good for weighing nautical things (sails, rubber boats anchors, trailer hitch-weights etc).

Geoff

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