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True, though the formula is generic. I just manually checked the winch ratio; it's 30:1, which means my drum would turn at 58RPM, not 76RPM, with my AC motor running at ID-plate RPM of 1750 RPM. I only had time to eyeball the drum ID but it looks like it's prolly 5", too. Not much impact on...

Here's yet another permutation of winch application...Gringletaube, please weigh in here. I'd been trusting the formula you cited but not sure what it's based on, so maybe that's the problem. I'm looking at repurposing a winch taken from a scrapped 5-ton, by using it in a stationary...