How much load goes through a genoa luff?

[Rivers & creeks]

Putting the final pieces together for a sail change. New sail 400 square feet, flown in up to 15 knots apparent, not hard on the wind, it's a 60 degrees plus sail. But crucially what's the typical luff load going to be? It's important because the furling gear and proposed luff wire are only rated to 1000kg.

Thanks for your help.

 

[KellysEye]

Pound load per square foot/mph here: http://bristolite.com/interfaces/psi_wind.aspx

 

[Heckler]

Putting the final pieces together for a sail change. New sail 400 square feet, flown in up to 15 knots apparent, not hard on the wind, it's a 60 degrees plus sail. But crucially what's the typical luff load going to be? It's important because the furling gear and proposed luff wire are only rated to 1000kg.

Thanks for your help.

my sheet winches are 54s, so multiplies the load 54 times? The winch handle is about a foot long, I push about 100 pounds? Do the math.
S

 

[lw395]

The loads on a sail are not just a function of the sail, but also the weight/righting moment of the boat under it.
Larrson and Elliasson (sp?) is the best book I've seen for guidance.

15knots apparent seems quite low to me, that's only about 12knots true.
Even if you only intended to use it in 12knots true, you'd want to handle gusts of 20 without catastrophe?

 

[JumbleDuck]

Putting the final pieces together for a sail change. New sail 400 square feet, flown in up to 15 knots apparent, not hard on the wind, it's a 60 degrees plus sail. But crucially what's the typical luff load going to be?

Enough that the forestay (just) goes slack?

 

[Rivers & creeks]

The loads on a sail are not just a function of the sail, but also the weight/righting moment of the boat under it.
Larrson and Elliasson (sp?) is the best book I've seen for guidance.

15knots apparent seems quite low to me, that's only about 12knots true.
Even if you only intended to use it in 12knots true, you'd want to handle gusts of 20 without catastrophe?

Yes. That needs factoring in.

 

[PuffTheMagicDragon]

If it were free flying, the load would be practically the same as whatever it is on the halyard. If it is hanked on (or in a foil) to a forestay the load would be shared because the hanks or the foil would be chipping in towards supporting the total load, thereby decreasing the pull at the head and the tack.

 

[knuterikt]

Putting the final pieces together for a sail change. New sail 400 square feet, flown in up to 15 knots apparent, not hard on the wind, it's a 60 degrees plus sail. But crucially what's the typical luff load going to be? It's important because the furling gear and proposed luff wire are only rated to 1000kg.

Thanks for your help.

You find some guidelines for sizing here
http://www.facnor.com/uk/products/g.../continuous_line/fichiers/codezeroandgenn.pdf