Old tractors, hp was measured at the wheels, pto, or pulley accounting for all frictional losses.
25 hp Kohler is measured at the engine.
Then what throws people is the pulling force. If you gear something down, a small engine can generate a large force.
An example of getting a lot of force from a small engine is hydrostatic tranny or hydraulics on a log splitter. Whenever you generate a large force, you slow the speed. The more you slow it, the greater the force.
Then Briggs got in trouble for inflating hp numbers. So you can't always believe what you read. Another example of inflating hp rating a shop vac, 5 hp shop vac, 120v and 15 amps, numbers don't add up.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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