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Winch speed and torque
Posted: 15 Jan 2006, 20:48
by Lester
I've produced a spreadsheet which should help figure out what kind of winch torque would produce what kind of sheeting speed, at
http://www.onemetre.net/Build/Servo/Servo.htm
Comments welcome!
Posted: 15 Jan 2006, 23:44
by Olivier Cohen
Hi Lester,
Great job, as usual!
Just a word : For an armwinch, you can't do the calculations with a constant radius.
The torque applied to the winch by the sheet line at each position is the line strength x armwinch radius x sin (angle between the arm and the sheet line) x 2 with the block on the arm
That's why with an arm winch it's often hard to sheet in downwind, but you get a "smooth" response when sheeted in, and a great strength.
Posted: 16 Jan 2006, 08:56
by Lester
OC44 wrote:For an armwinch, you can't do the calculations with a constant radius
Bonjour Olivier
You are right, but I think the very simple calculation is fine to estimate maximum torque required and hence the worst-case sheeting speed.