motolou Posted March 18, 2022 Report Posted March 18, 2022 I am seriously considering purchasing a M20C. Of course, I am going to get checked out, but I was wondering how do we stay out of the 2000-2250 rpm range while in the pattern? Isn't that the rpm range that maintains altitude and pattern speed?
ShuRugal Posted March 18, 2022 Report Posted March 18, 2022 That range is only forbidden for cruise operations. Transiting through it all low power on descent is expected and not harmfulSent from my Pixel 3a using Tapatalk 2 1
Andy95W Posted March 18, 2022 Report Posted March 18, 2022 6 minutes ago, ShuRugal said: That range is only forbidden for cruise operations. Transiting through it all low power on descent is expected and not harmful +1
A64Pilot Posted March 18, 2022 Report Posted March 18, 2022 You should be able to easily fly at higher RPM, it only at low power when the prop is on its low RPM stops that RPM will decay to that point, My J model avoid range is 1500 to 2000, which is where I want to be on final, but it’s not hard to carry 2000, then reduce to idle, it just takes getting used to it is all. I’d probably be fine in the range at low power for as long as final takes, but it says avoid and I easily can, so I do. People have been flying these things for over 50 years, if it were an issue, everybody would bad mouth a Mooney about it and they don’t, so it’s not an issue.
carusoam Posted March 18, 2022 Report Posted March 18, 2022 Welcome aboard Lou! Keep in mind…. 1) The rpm range is not blocked from use, so minimizing the time spent there is OK… 2) Power settings in the traffic pattern are mostly MP settings… often weight and temperature dependent… 3) Most often, 2700 rpm is selected getting ready for landing, and the optional go around… 4) There are methods for eliminating that range…. A newer different prop… and a tach re-facing… 5) The detail is all about harmonic vibration under those conditions…. You won’t ever know the harmonics exist… they are hidden amongst the regular vibrations that are there at the same time… 6) It is good to have the prop dynamically balanced for smooth operation… PP thoughts only, not a mechanic… Best regards, -a- 1
Recommended Posts