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Nov 8, 2010
Beneteau First 36.7 & 260 Minneapolis MN & Bayfield WI
1/12th of the vang load of a 165 sqr/ft main?? No problem.
Jun 25, 2004
Corsair F24 Mk1 003 San Francisco Bay, CA
What matters is the safe working load and safety factor.

Using a J24 vangas an example, take a look at

The J24 Vang blocks attached to the boom and the mast have a safe working load around pounds at least 750 pounds, and safety factor of between 3 to 4. So a breaking load of 2500-3000 pounds is in the ball park.

The blocks in the middle of the cascade can be lesser strength, depending on the mechanical advantage of the falls.

see also, Harkens recommendations for the Vang on a J105 (35.5’)

for a J105, Harken recommends a block with a safe working load and breaking strength about 2500 for the blocks on the bond of the cascades (on the boom and mast)

I Don’t know of any 29 mm blocks with breaking strength over 2000. The Harken 29 mm wire block has a 2000 pounds max anda safe working load load f 500. Harken 29 mm Carbo blocks have a breaking strengthof 1000 pounds.

ps sorry for the bad typing and grammar errors. I’m typing on my iPad with one hand.
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