Posted by Indiana Ken on January 03, 2012 at 17:01:42 from (66.249.233.66):
In Reply to: Drawbar HP posted by bradley martin on January 03, 2012 at 08:58:40:
Quoting Removed, click Modern View to see
By definition: Horse Power is force times distance per unit time, the equation is; 1 HP=33,000Ft-Lb/Min. Typically, the test books will show a horse attached to a rope which goes around a pulley and is then attached to a weight. Since the weight is lifted vertically it is the force used in the equation, the distance must also be measured and the amount of time it took to lift the weight. For drawbar horse power one needs a pull scale to measure the force (pull) and then the speed (distance/unit time) is measured.
For example, if a tractor generates a drawbar pull of 150 Lb and is able to maintain a steady 2.5 MPH, the HP is calculated as follows; Note 2.5 MPH = 220 Ft/Min, therefore we have 150 Lb x 220 Ft/Min = 33,000 Ft-Lb/Min which is equal to 1 HP.
Note - in the above example the tractor may have been pulling a 1000 Lbs of weight to generate the drawbar pull of 150 Lbs - since the weight is pulled horizontally it is the draw pull not the actual weight we use in the calculation.
How does this relate to horses? It has been claimed a horse can walk 2.5 MPH while lifting a 150 Lb weight vertically.
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