Posted by JDNewbie on January 28, 2011 at 21:51:21 from (24.255.128.42):
In Reply to: HP??? posted by dave2 on January 28, 2011 at 13:32:13:
This is a great discussion. I have often wondered if they can get 35 HP out of the little outboard on my boat, why does a 35 HP tractor have to be so big (comparatively)?
The only thing that kinda made sense to me was thinking about the length of the stroke and the RPM and comparing it to using a wrench to turn a nut. A longer stroke is sorta like putting a cheater bar on a wrench. I'm not suddenly stronger, but the wrench is certainly easier to turn. If I hit the wrench with my hand rather than just pushing on it, a stuck bolt will sometimes move. Again, I'm not stronger, but the added energy of the higher speed makes it move (kinda like higher RPM). Don't know if that is entirely "correct", but I wasn't planning on plowing the lake bottom with my boat anyway.
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