Originally Posted by Aerobat77
one more thing , but maybe i understand you not right : the 19600 in/lbs must be the value for the torque on the propeller, not the turbine by itself since a device which spins 13800rpm and produces simultany massive 19600 in/lb of torque would have an asronomic power ( 19600x13800/5252 = 51500 shp!!! )
Aerobat, the Torque value for the Allison 501 is engine torque. As someone else (Old fella, I think) said, the torque is measured at the engine output/gearbox input shaft. The thing is, the 19600 is *inch* pounds. The equation: torque*rpm/5252 if for *foot*-pounds (or pound-feet) Divide your astronomic power by 12 and you'll get 4300 hp, in round numbers, which is about right for an Allison 501.