Cruise engine RPM
Posted: Thu Mar 10, 2022 6:27 pm
I have to admit my ignorance.....again!
Although I have significant experience operating Lycoming and Continental engines I have exactly 32 hours of Rotax 9 series experience.
I find that my 2009 Gobosh 700 flies at about 100 knots, using 4.8 GPH, at about 4900 engine RPM.
It is a comfortable ride and is flying plenty fast enough to bore holes in the sky.
The prop seems to be pitched okay. At a 1000 foot DA the full throttle engine RPM in the climb, at 70 knots, is about 5300.
Now the question. Am I hurting the engine by cruising at this RPM? I follow discussions that indicate people avoid cruise operation below 5000, or even 5200, RPM.
Thanks,
Jim
Although I have significant experience operating Lycoming and Continental engines I have exactly 32 hours of Rotax 9 series experience.
I find that my 2009 Gobosh 700 flies at about 100 knots, using 4.8 GPH, at about 4900 engine RPM.
It is a comfortable ride and is flying plenty fast enough to bore holes in the sky.
The prop seems to be pitched okay. At a 1000 foot DA the full throttle engine RPM in the climb, at 70 knots, is about 5300.
Now the question. Am I hurting the engine by cruising at this RPM? I follow discussions that indicate people avoid cruise operation below 5000, or even 5200, RPM.
Thanks,
Jim