Champ C85-8 RPM Range Avoidance?

[Low Lead]

Apologies if this is common knowledge but is there a technical spec that recommends against continuous operation between 2050 RPM and 2300 RPM on a C85-8? I like this RPM range on downwind and it still seems smooth as a hot stick of butter... I'm spinning a McCauley round tipped climb prop. Thanks! - Mike

 

[Sully]

Is there a restriction listed in the STC paperwork for installing the C-85?
I've not run across the restriction. BWDIK

 

[Sully]

Yours is an L-16 isn't it?
Ref the Military Flight Handbook Sect 2-2.
There is a restriction between 2030 & 2270.

 

[Sully]

Sent you a message. Check inbox in the upper right next to your name.

 

[Bob Turner]

Tell us more. Why isn’t the civilian version restricted? I have been running C-85s for four decades, and fly three of them almost daily - never heard of a restriction.

 

[Sully]

I don't see a reason for the restriction. The Aircraft Spec Sheet (TCDS) states that the L-16A is the same as 7BCM.
But I am not his IA.

 

[Sully]

Further research indicates the aircraft is indeed a 7BCM s/n 7BCM-503.

 

[Low Lead]

Thanks Sully - Just saw your PM. Yes your research is correct - 7BCM-503 - as far as I can tell a carbureted C85 doesn't know if its in an L-16 or a 7AC. I'm guessing the rev restriction in the Military Flight Handbook may have something to do with fuel injection system that L-16s left the factory with. Again that's just my guess though. It's just that I really like that part of the power band above the carb heat zone but not firewalled.

 

[Low Lead]

Further research seem to indicate this was a wood prop RPM restriction.

 

[Bartman]

thanks for the update and clarification @Low Lead