Not to satisfy some numbers. Since the Ercoupe brakes are suited for slowing the plane down, but not so much for holding the plane at full throttle in a static position, it is common sense to do this kind of run up at a lower rpm. I am using 1600 rpm and I am seeing magneto rpm drops between 25 and 75 rpm. Anything more and I have to look deeper into the issue. Think about it, you don't do a full throttle run up in a tail dragger either.
Well said Hartmut! In the Aeronca L-3 I don't go over 1500 because I want to stay off the runway until the runup is completed...Ken
