Hi everyone, new to this forum so first sorry for my english, I´m from Sweden so my english isn´t prefect.

I just got the plans for scratch building a CH 701 and I cant wait to start.

Right now I am trying to collect all the information about everything I can and have a question about engings.

I really like the autoconversion engines and I´m aware of the + and - with those engines.

But there is one thing I cant understand and that´s when someone is warning my for the high RPM an Autoconversion have.

So my question is why is it harder on the engine to drive it 1 hour @ 6000rpm then 2 hour @ 3000 rpm or 4 hours @ 1500 rpm like many cars do on the highway? of course as long as the engine temp is ok.

I have not find any good answers to that questions yet and maybe someone here knows a little bit more about engine engineering than I do

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Our test flight numbers show a comfortable 50 KIAS at 3710 rpm (2.4 gph) and 60 KIAS at 3966 rpm (2.6 gph).  Being that this aircraft is built for STOL, it's prop is pitched for a max 5400 rpm during climb-out, and we never intend to exceed 5400 rpm during level flight.  Our rpm at 70 KIAS is 4380 rpm (3.6 gph).   This aircraft will easily climb at much lower rpm, and as you can see will not likely be operated above 4500 rpm during level flight.  https://l.facebook.com/l.php?u=https%3A%2F%2Fdocs.google.com%2Fspre...

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