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Lewis Winch and MS661-CM powerhead specs:
7.3 hp
4,000lb pull force single line
60 ft/min line speed (presumably unloaded, full drum)
Lewis Winch and MS362-CM powerhead specs:
4.7 hp
~2500lb pull force single line
60 ft/min line speed (presumably unloaded, full drum)
Portable winch PCW5000 specs:
2.1 hp
2,200lb pull force single line
40 ft/min line speed (presumably unloaded)
4 stroke engine (drawback in my mind)
One thing to consider is that with a capstan winch you have the same pull performance and throughout the entire pull because the drum never changes in diameter. I believe Portable Winch also offers different size drums so you can trade line speed for pull force to best suit your application.