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ercoupe performance

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30 Sep 2017 18:47 #13 by Allen Deyoe
Replied by Allen Deyoe on topic ercoupe performance
Larry, it appears I have a McCauly CM7346 the standard prop for a 75hp. That means I have longer prop than your recommended size. I would think 46 would be a climb prop. What would you suggest I do?

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29 Jan 2017 17:43 #14 by Tim Treat
Replied by Tim Treat on topic ercoupe performance
o-200 crank stc and a 48 pitch is a rocket ship ;)

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25 Jan 2017 19:37 #15 by Bud Bornemann
Replied by Bud Bornemann on topic ercoupe performance
Ken, Sorry for leaving you hanging. I'm definitely satisfied with the improved performance in the climb,lost about 3to4 mph in cruise but that's ok with me. I don't have actual numbers in my head but will pay more attention the next time I fly. Right now a small wiring issue has turned into close to a complete panel rewiring job so I'm down for awhile.

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25 Jan 2017 11:33 #16 by Ken Thompson
Replied by Ken Thompson on topic ercoupe performance
Hey Bud, this is an old thread but you kinda left us hanging. What was the final outcome of your prop job? What numbers do you get? What pitch did you end up with.
Have you been happy with your performance since the prop overhaul?
What sort of cruise performance do you get?

Thanks!

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24 Nov 2015 20:43 #17 by Bud Bornemann
Replied by Bud Bornemann on topic ercoupe performance
I had a chance to fly today and the climb performance is greatly improved, about 600 FPM
and I saw very close to 2500 RPM on climb out that's about the 100 RPM increase the mechanic said I needed.
Can't respond to exactly what it was pitched to yet but I believe it was 48 before, don't know the
diameter as I wasn't smart enough to measure it but will check. Do not believe it was shortened any.

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23 Nov 2015 17:16 - 23 Nov 2015 17:17 #18 by Larry Snyder
Replied by Larry Snyder on topic ercoupe performance
A 48 is already a climb prop. A 46 is extreme climb, a 47 or 48 is a climb prop, a 49 is a mild climb (that's what I have) and a 50 is standard. Beyond that are various flavors of cruise prop.
Do you know the length of the prop? The permitted range for a McCauley prop on a C-85 is quite narrow, 69.5 to 71 inches. Mine is a 71-49.

Larry
N99340
Last edit: 23 Nov 2015 17:17 by Larry Snyder.

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