Re: PTO h.p. vs. DRAWBAR h.p.?

Posted by Bob M on February 15, 2005 at 13:40:40 from (151.190.254.108):

In Reply to: Re: PTO h.p. vs. DRAWBAR h.p.? posted by Lou on February 15, 2005 at 07:12:47:

Simplest way to measure torque is to mount either the motor or the load in a cradle suspended on ball bearings. The reaction force to prevent the cradle from rotating is taken by an arm fastened to the cradle and is measured by a simple balance or scales.

Torque is then easily calculated: Torque = the force measured by the scales (in lb) x the length of the lever arm (in feet).

Now to determine horsepower you must know the torque and ALSO engine speed. Horsepower is then calculated by the equation HP = Torque x RPM / 5,250.

Modern dyno's will take the above measurements, do the calculations and display HP directly.

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