David-aviator
Well Known Member
At 9500 MSL (11,450 DA) a few numbers were recorded with regard to LOP.
It took a while to get everything stabilized. RPM was set to 2500 with a resulting MP of 19.0. Fuel flow was set to 7.9 gph.
None of the EGT's peaked until reaching 6.8 gph on fuel flow. At that point #1 #2 and #3 showed the first decrease in temperature. #4 was still climbing but just by 2 degrees. RPM never increased but did begin to drop off at 7.6 gph.
The next step was 6.7 gph. Much to my surprise, #1 EGT increased to 1470 from 1455 after showing a 1456 to 1455 decline at 6.8 gph. RPM had dropped off to 2440. At that point I terminated the effort as the trend made no sense. Could a decreasing RPM affect EGT?
I am inclined to concluded LOP will not work without a constant speed prop.
Is anyone doing LOP with a fixed pitch prop?
It took a while to get everything stabilized. RPM was set to 2500 with a resulting MP of 19.0. Fuel flow was set to 7.9 gph.
None of the EGT's peaked until reaching 6.8 gph on fuel flow. At that point #1 #2 and #3 showed the first decrease in temperature. #4 was still climbing but just by 2 degrees. RPM never increased but did begin to drop off at 7.6 gph.
The next step was 6.7 gph. Much to my surprise, #1 EGT increased to 1470 from 1455 after showing a 1456 to 1455 decline at 6.8 gph. RPM had dropped off to 2440. At that point I terminated the effort as the trend made no sense. Could a decreasing RPM affect EGT?
I am inclined to concluded LOP will not work without a constant speed prop.
Is anyone doing LOP with a fixed pitch prop?