old said: (quoted from post at 23:04:18 11/23/14) Now days HP is based on RPM where as when those old tractor where built HP was based on torque power so yep saying a lawn mower has more power it like comparing a big rock to a big tree. Neither one has to do with the other.
No. The mathematical relationship of mechanical HP to torque and RPM, has not changed since James Watt first devised the unit of measurement ca.1750:
1 hp ≡ 33,000 ft-lb/min
TOH
This post was edited by TheOldHokie at 07:14:47 11/24/14.
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