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Old 02-18-2007, 05:56 PM   #1
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Scale sailing vessels

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I am building a model of a gaff-rigged Bristol Channel Pilot Cutter - about 38 inch hull length.

One of the problems I have not yet figured out is how to get sufficient travel for the mainsheet.
With a 5 inch arm and 90 degrees servo rotation, the mainsheet travel I can obtain is only about 7 inches. Even if the sheet is connected to the boom partway along - rather than at the outer end, I still need about 16 inches of mainsheet travel between the boat being close-hauled and when it is on a dead run.
I am sure that this problem has been solved before and would be glad of any suggestions.
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Old 02-18-2007, 09:32 PM   #2
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I am: Bill C
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depending what servo torque is available fitting a single sheave on the arm and anchoring the dead end of the line in line with your first turning block would double the line pull.
Fitting a double sheave at the first turning block, bring the line through one sheave then through the block on the servo arm back round the second of the double sheaves, then anchor the line dead end to the arm, this would give you three times the length of line pull but the pull or torque would be only one third of original.
The sheave on the arm can be fitted with a point to tie of the dead end this is called a single sheave with a BECKET.
Bill C
To fly like a bird with radio control
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