Re: Horsepower Question

Posted by Bob M on March 07, 2007 at 07:50:46 from (151.190.254.108):

In Reply to: Horsepower Question posted by Ben Shipley on March 07, 2007 at 06:46:21:

Ben – PTO horsepower is essentially the engine’s net flywheel horsepower less the (relatively small) transmission losses thru the PTO driveline.

Drawbar HP on the other hand is the horsepower available to do “pulling” work. It is the engine net flywheel horsepower LESS losses in the transmission, tire friction/slippage loss, and the HP required to physically move the tractor over the ground. The last two items can vary considerably depending on the gross weight of the tractor, the nature of the ground being covered (soft and loose vs hard and firm), tire design/tread pattern, etc. Your suspicion these losses can consume 15% to 25% of a tractors gross flywheel HP not far off (look at a few Nebraska Tractor Test summaries sometime!)

Bottom line: If you want to compare a tractor’s ability to do pulling work in the field, drawbar HP is the number you want to be looking at. Drawbar HP is what truly “hauls the mail”.

Replies:

• Re: Horsepower Question Hugh MacKay 14:51:05 03/07/07 (2)
  • Re: Horsepower Question Bob M 19:05:24 03/07/07 (1)
    • Re: Horsepower Question Hugh MacKay 00:29:00 03/08/07 (0)

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