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Rpm issues

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16 Jul 2022 21:05 #1 by Terry Reece
Replied by Terry Reece on topic Rpm issues
Thank you. That gives some assurance I’m in the ball park..I think I will re-pitch the prop to 48 at some point
Terry

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16 Jul 2022 20:43 #2 by William James
Replied by William James on topic Rpm issues
On the C-85 max RPM book is 2575 . My recent Ercoupe had almost identical performance as yours . . .
2200 RPM static
McCauley 7150 prop
Max cruise I got was 2450 RPM full throttle , I have been told the prop pitch dictates max RPM
engine 150 SMOH
I cruised @ 2200 RPM 5gph (I have mixture control cable) 110 MPH

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16 Jul 2022 19:46 #3 by Terry Reece
Replied by Terry Reece on topic Rpm issues
Sounds like a plan.
Take care

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16 Jul 2022 19:35 #4 by Larry Snyder
Replied by Larry Snyder on topic Rpm issues
I think you’d really like a 48. It doesn’t slow you that much, and you will notice an increase in performance.
The following user(s) said Thank You: Terry Reece

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16 Jul 2022 18:52 #5 by Terry Reece
Replied by Terry Reece on topic Rpm issues
Larry
Yes it as an illegal prop. Previous owner forwarded funds, so bought the new McCauly I might have it re-pitched this winter to a 48 in SEA

Thank you for your input
Terry

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16 Jul 2022 18:45 #6 by Larry Snyder
Replied by Larry Snyder on topic Rpm issues
Wow, a 54 is way beyond anything I’ve seen. Probably not legal. You might have a mechanic check out your static speed. I don’t think you’re far off, if you’re off at all.

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