Max RPM in level flight

[DannyDot]

I have a C-85-8 engine and only get 2300 RPM at max throttle in level flight (1,000 feet altitude). I don't know which prop I have, I need to take a look, but it is wood.

This seems low to me. Any comments.

Danny Deger

[Guest]

Re: Max RPM in level flight

I have a C-85-8 engine and only get 2300 RPM at max throttle in level flight (1,000 feet altitude). I don't know which prop I have, I need to take a look, but it is wood.

This seems low to me. Any comments.

Danny Deger

hmm, does seem low, my 65 will turn that with a 1b90cm7049.

I would check it with an optical tach. Maybe your mech tach is wrong?

Dave

[astjp2]

Re: Max RPM in level flight

I got 2700 with a 74ck-43 and climb @ 2400 with an O-200. Tim

[Len Petterson]

Re: Max RPM in level flight

85 mph indicated ( GPS verified) @ 2150 on /Mc Caully 74 45.
air temp 18C/64 F 95 % humidety
90 @ 2300 rpm.
Len
Allmost nose bleed speed!
I do have a weak nose!