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Old 09-12-2012, 13:01   #1
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Location: On Vessel WINGS, wherever there's an ocean, currently in Mexico
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Question Challenge: Calculating a rig change

Here is a little brain teaser:

I needed to rake my mast back to get a little more weather helm (it helps me go to windward).

I lengthened the forestay by extending the turnbuckle, which let the top of the mast move back.

I took in the slack in the backstay by the same method.

Now, say I let out 10" on the forestay, how far back did the top of the mast move?

I needed a quick and easy answer and I found one which took about 3 minutes.

What is it?

Clue: use trig and don't worry if the answer is imprecise.
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Old 09-12-2012, 13:05   #2
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Wink Re: Challenge: Calculating a rig change

Quote:
Originally Posted by wingssail View Post
Here is a little brain teaser:

I needed to rake my mast back to get a little more weather helm (it helps me go to windward).

I lengthened the forestay by extending the turnbuckle, which let the top of the mast move back.

I took in the slack in the backstay by the same method.

Now, say I let out 10" on the forestay, how far back did the top of the mast move?

I needed a quick and easy answer and I found one which took about 3 minutes.

What is it?

Clue: use trig and don't worry if the answer is imprecise.
(BTW, my mast is 60ft and my foredeck is 16ft)
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Old 09-12-2012, 13:16   #3
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Re: Challenge: Calculating a rig change

Pythagoras. It's a triangle.
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