where:

 

image\PERF1110_wmf.gif

is the propeller efficiency.

 

image\PERF1111_wmf.gif

is the aircraft lift coefficient at the given flight condition.

 

image\PERF1112_wmf.gif

is the ratio of the air density at landing altitude and ISA to that at sea-level and ISA.

 

image\PERF1113_wmf.gif

is the number of engines on the aircraft.

 

image\PERF1114_wmf.gif

is the FAR 25.111 One Engine Inoperative climb gradient at approach requirement.

 

image\PERF1115_wmf.gif

is the drag coefficient.

 

image\PERF1116_wmf.gif

is the increment in drag coefficient due to a stopped propeller.

 

image\PERF1117_wmf.gif

is the aircraft landing weight.

 

image\PERF1118_wmf.gif

is the aircraft take-off weight.

 

image\PERF1119_wmf.gif

 

is the wing loading at take-off.