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Re: What is drawbar horse power?
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Posted by Rod F. on June 17, 2005 at 14:29:41 from (142.177.76.50):
In Reply to: What is drawbar horse power? posted by frankiee on June 17, 2005 at 12:15:44:
Drawbar horsepower is simply a measure of power at the drawbar. In effect, it is the amount of power that the wheels can put to the ground. Basically, it is determined by measuring the pounds of pull exerted on the test car, and the speed at which it was pulled. Other measures include Gross engine power, which is the amount of power the engine produces before ancillories (water pump, alternator, etc.) are added. Net engine (also flywheel or brake HP), is a measure of power at the flywheel of an engine as shipped or in operating condition (with ancillories). This will always be less than Gross power. PTO power is the most common measure of power on farm tractors today in the North American market, largely due to the Nebraska Tests. It is simply measured at the output shaft, and is always less than Flywheel power due to friction losses through the drive system. Belt HP was another common measure of power in days gone by. On many older tractors, there was no PTO, only a belt pulley. This was an effective measure of power. Again, this was less than flywheel power, and generally less than PTO power due to belt slipage.
There is no formula that I am aware of to convert the drawbar figuer for your H to brake HP, other than to do the various efficiency calculations for the drivetrain. As a rough guess, I would say that brake HP was somewhere in the 35-40 range on the H. I'm sure that spec is familiar to some of the Farmall folks on this board or the IH board. HTH. Rod
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