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ercoupe performance

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02 Oct 2017 13:17 #1213 by Larry Snyder
Larry Snyder replied the topic: ercoupe performance
A 73" prop is legal only on the C-75. It is illegal to put that prop on a C-85. If you read the type certificate A-718 you will see that for the 85 horse engine the legal length for a McCauley prop is 69 ½ to 71 inches. The longer prop actually steals your horsepower - remember, hp comes from rpm, and a long prop is intended to spin more slowly with more torque.

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30 Sep 2017 18:47 #1207 by Allen Deyoe
Allen Deyoe replied the 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 #799 by Tim Treat
Tim Treat replied the topic: ercoupe performance
o-200 crank stc and a 48 pitch is a rocket ship ;)

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25 Jan 2017 19:37 #794 by Bud Bornemann
Bud Bornemann replied the 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 #793 by Ken Thompson
Ken Thompson replied the 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 #234 by Bud Bornemann
Bud Bornemann replied the 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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