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#1
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Block and Purchase Question #2
You have a rigid vang. It is rigged with a wire
rope from the base of the mast, through a sheave at the boom, and then to a rope purchase that is a double becket block and lead down to the mast base with another double block. The rope is then lead to a single block at the mast partners and then to a cleat aft of the mast. What is the purchase ratio? [1 pt] What is a simple way to determine any given purchase ratio? [2 pts] Since your mainsail area is large, you decided you want to increase the final purchase, name a way to do this? [1 pt] |
#2
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Block and Purchase Question #2
If you are such a clueless brat, why don't you google you pathetic
questions? You are not a sailor if you don't know the answer, BART,. |
#3
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Block and Purchase Question #2
Bart wrote:
You have a rigid vang. It is rigged with a wire rope from the base of the mast, through a sheave at the boom, and then to a rope purchase that is a double becket block and lead down to the mast base with another double block. The rope is then lead to a single block at the mast partners and then to a cleat aft of the mast. What is the purchase ratio? [1 pt] The block at the mast partners is not actually on the mast, right? Ok, then that's just a turning block, so it adds no purchase. The double blocks provide a 4-1 purchase. The cascade above doubles that for 8-1. And that's my final answer. What is a simple way to determine any given purchase ratio? [2 pts] Count the lines. Multiply by 2 for each simple cascade. If you are using a multi-purchase system to pull another multi-purchase system, multiply the two together. For instance, a 4-1 that pulls on a 3-1 is 12-1 overall. In the example above, a 4-1. But when you count lines, don't count the ones that merely change direction without providing purchase. Since your mainsail area is large, you decided you want to increase the final purchase, name a way to do this? [1 pt] Add a cascade to make it 16-1. -- -- // Walt // // There is no Volkl Conspiracy |
#4
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Block and Purchase Question #2
4 points to you Walt.
"Walt" wrote Bart wrote: You have a rigid vang. It is rigged with a wire rope from the base of the mast, through a sheave at the boom, and then to a rope purchase that is a double becket block and lead down to the mast base with another double block. The rope is then lead to a single block at the mast partners and then to a cleat aft of the mast. What is the purchase ratio? [1 pt] The block at the mast partners is not actually on the mast, right? Ok, then that's just a turning block, so it adds no purchase. The double blocks provide a 4-1 purchase. The cascade above doubles that for 8-1. And that's my final answer. What is a simple way to determine any given purchase ratio? [2 pts] Count the lines. Multiply by 2 for each simple cascade. If you are using a multi-purchase system to pull another multi-purchase system, multiply the two together. For instance, a 4-1 that pulls on a 3-1 is 12-1 overall. In the example above, a 4-1. But when you count lines, don't count the ones that merely change direction without providing purchase. Since your mainsail area is large, you decided you want to increase the final purchase, name a way to do this? [1 pt] Add a cascade to make it 16-1. // Walt |
#5
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Block and Purchase Question #2
Damn... I should have said something.. that's what I had on the vang for my
Cal, except that it wasn't a rigid vang. :-( -- "j" ganz @@ www.sailnow.com "Bart" .@. wrote in message ... 4 points to you Walt. "Walt" wrote Bart wrote: You have a rigid vang. It is rigged with a wire rope from the base of the mast, through a sheave at the boom, and then to a rope purchase that is a double becket block and lead down to the mast base with another double block. The rope is then lead to a single block at the mast partners and then to a cleat aft of the mast. What is the purchase ratio? [1 pt] The block at the mast partners is not actually on the mast, right? Ok, then that's just a turning block, so it adds no purchase. The double blocks provide a 4-1 purchase. The cascade above doubles that for 8-1. And that's my final answer. What is a simple way to determine any given purchase ratio? [2 pts] Count the lines. Multiply by 2 for each simple cascade. If you are using a multi-purchase system to pull another multi-purchase system, multiply the two together. For instance, a 4-1 that pulls on a 3-1 is 12-1 overall. In the example above, a 4-1. But when you count lines, don't count the ones that merely change direction without providing purchase. Since your mainsail area is large, you decided you want to increase the final purchase, name a way to do this? [1 pt] Add a cascade to make it 16-1. // Walt |
#6
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Block and Purchase Question #2
"Bart" .@. wrote | You have a rigid vang. Yummy! giggle Cheers, Ellen |
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