Re: How much power is eaten up thru gears?

Posted by Athol Carr on July 21, 2007 at 14:41:39 from (219.89.29.20):

In Reply to: How much power is eaten up thru gears? posted by Farmall MD on July 21, 2007 at 09:33:22:

The gears take some power, some old rough figures were 5% per set of gears. The difference between belt power and drawbar horsepower is the number of gear sets, the F-12 belt has one one set of bevel gears to drive the belt pulley while there at least four to the back axles (bevel input to gear-box, one in the gear-box, one the the differential counter-shaft and one to the back axles. there is also rolling resistance, with steel wheels the ground is permanent deformed by the rigid wheels (the ground level behind the wheel is lower than that in front, i.e. permanently climbing up-hill) and the lugs have to be driven into the ground and then lifted out again. With Pneumatic tyres the rolling resistance is considerable reduced the re is less ground deformation though there is the energy lost in tyre flexure. The F-12 was rated 14hp on the belt, so probably produced something like 17hp at the flywheel.

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