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THE PREFERRED METHOD First of all, the main consideration in computing SFPM (surface feet per minute). One must first ascertain the outer surface under consideration and the RPM (revolutions per minute). A person should take a tape measure, one that will bend, and determin the feet and inches around the object (wheel)outer surface. Another method that is acceptable would be to wrap a peice of rope around the wheel and mark the point clearly, then on a flat surface measure the "marked" piece of rope with a "yardstick" from your local hardware store. After the aformentioned computation has been ascertained and wrote down (on the side of the wheel is permissible) Then the RPMs (revolutione per minute)is next sought of the wheel, not the engine, because it would depend on what gear the tractor was in. The correct RPMs would have to be ascertained by observation, that is with a stop watch. One would observe the wheel rotating for one minute, and "chaulk down" the correct amount (RPMs) again on the side on the wheel under consideration. Once the above has been correctly computed, then it would be a mater of the correct mathmatical application. Multiply the "leanth" (around the wheel) times (X) the "RPMs (multipilcation), and the relult should be SFPM (surface feet per minute). AN ALTERNATE MEATHOD An alternate approach, would be the relationship between the diameter and the circumferance (PI), ths is computed by dividing the diameter into the circumferance, (not the kind you eat, wheather it be cherry, apple or blueberry, although both are usually considered round most of the time) Upon examination one will ascertaine that the diameter will divide into the circumferance three (3) times and a small amount left over. Take that to two(2) decimal places for accuracy, the answer will be 3.14. After this point multiply PI (3.14) times the diameter of the wheel (measured in feet) and your answer will be the same as above regardless of the meathod you use. THE SUMMING MEATHOD Now in the event a person does not know how to multiply, they can use the "summing meathod", that is sum "add" the circumferance, PI (3.14) times. THE BEST GUESS MEATHOD This meathod is most widely used, because it cannot be disproved by local college math professors, and has gained world-wide acceptance over the last four decades. A MEANINGLESS (USELESS) COMPUTATION Now in the event that a person does not know how to apply the meathod mentioned above, consider the following. WHAT IS THE POINT IN "SFPM" (SURFACE FEET PER MINUTE), it is a "useless" figure (computation) and does not prove or accomplish anything and it is a know fact the RPMs to not remain constant. In fact it would take a "complete fool" to even be thinking in this direction in the first place.
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