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The ballscrew idea is not great since it can be easily backdriven. Most likely the motor that is attached to it has a brake on it or a gearbox.

Since you are also concerned about holding the boom up when dropping the sail as well as pulling it down when reaching, you can use a topping lift and boom vang combination. It is very affordable since it is only a few blocks and some line.
 
1 - 1 of 7 Posts