Is there a general rule of thumb for input force on a hand crank winch?

Question:
Is ther a rule of thumb for input force on a hand crank winch?

I need a conflict. A bunch of women are going to get together and build a boat and enter a really important?

This is a continuation of my previous question.

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I have read that whn pulling a rope an average man can apply about 75% of his weight.

Why do you enjoy boats and/or boating?

I doing calculations does one assume .5 or .75 for the efficency?

Answers:

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General rule is only use your hand to crank it. More input than that will likey break it.

In the movies about sailing ships the sailors are always climbing around on the masts and sometimes getting?

Efficiency varies by alot of factors, primarily friction. Ball bearings in the device help reduce the friction. Plain metal wheels on metal axles do not help.

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I don't see how the amount of force someone could place on pulling a rope would have anything to do with a hand crank winch. Plus it would make a difference as to friction, mechanical advantage (if any) and a host of other factors.

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Generally speaking, I have seen hand cranked winches pull in 26ft pontoon boats, 20ft river boats, or something like my dinky 8ft pontoon boat (aka the AquaCub) that are all the same size. I have never heard of rules of thumb for such a thing, but I've heard and seen crazier things in the world, especially when it deals with boating.

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