Diamond Sweepback

Hello all
Does anyone have experience with the calculations on sweepback on diamonds on a mast. I am building my mast now and can go out and measure some boats moored nearby but someone may have some numbers.

I will also be able to have some lowers/intermediates coming from the diamonds to stop forward pumping. The boat is solid and not flexible.

cheers

Phil

 

Hi Phil
Have you made any progress?

The reason for my question being, the guys were discussing this Friday and suggested a GL paper available on masts and rigging, we can scan and email you if you don't already have it.

We have recently been discussing the same thing with Southern spars, they analised a rig for us, surprisingly they suggested a minimal increase in spreader rake made quite a difference and also suggested we move the rotation point aft this creating a complementary moment to the few degrees extra spreader rake.

I am sure we have other information in archive I could scan for you also.
I am available direct on admin@ezifoldyachts.com.

Brooke and Team Ezifold

QUOTE=catsketcher;744865]Hello all
Does anyone have experience with the calculations on sweepback on diamonds on a mast. I am building my mast now and can go out and measure some boats moored nearby but someone may have some numbers.

I will also be able to have some lowers/intermediates coming from the diamonds to stop forward pumping. The boat is solid and not flexible.

cheers

Phil[/QUOTE]

 

That would be good to read the article. I used to have one by a Kiwi designer but seem to have mislaid it

cheers

Phil

philthompson67@gmail.com

 

Missed this one. I guess your mast is fixed, not rotating, as if so then the genoa leech position will determine sweep back. I generally use between 10-15 deg but rigger seem to do their own thing, whatever I say

You certainly want some sweepback and of course, balance the stay forces. But I think you know all this anyway.

Richard Woods

Richard Woods

 

Phil
Check your in box.

Regards
Brooke and Team Ezifold