Originally Posted by
FGD135
You cannot tell from RPM alone whether the engine is "making power". Positive torque would be a more correct term for this, by the way.
I have said that Tq is what makes power from the start. What im saying here is at 2000 rpm it is making power ie what is the min Tq at 2000rpm ? . Max Tq at full fine at take off power is controlled by the power lever not via the prop lever.
Therefore the Tq at this speed is better min and max.
At 1586 rpm the engine is not considered in the power range as it is not in prop gov min speed range.
Therefore it has not even meet min Tq.
To determine whether positive torque existed or not requires knowledge of the RPM and the propeller blade angle.
It is self evident that the torque produced by the L engine was a very low value. Possibly positive, possibly negative.
Negative Tq. Are you really sure. Are you saying the prop is in beta range or feather. Therefore the slash marks on the roof arnt slash marks which now marks what of the 2000 to 1586 rpm that has been quoted.