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ercoupe performance

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23 Nov 2015 17:16 - 23 Nov 2015 17:17 #230 by Larry Snyder
Larry Snyder replied the 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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23 Nov 2015 16:41 #229 by Bud Bornemann
Bud Bornemann replied the topic: ercoupe performance
Thanks for the reply. My prop was taken off and sent to prop shop. It should have come back yesterday,
after installation mechanic is going to check static RPM and test fly to check performance. He did not mention
that it would be shortened only repitched.. Static RPM was about 100 RPM low so pitch was to be flattened.
It was 48 not sure what the mechanic and prop shop came up with but know there was a discussion between them
and they know I'm looking for better climb performance and willing to give up some cruise. I would be very happy
with the performance that you ended up getting. Crummy weather here now and Thanksgiving coming up so don't
know if he will get to it right away, they seem to be busy all the time.

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23 Nov 2015 15:29 #228 by Jim Greer
Jim Greer replied the topic: ercoupe performance
Check and be sure your prop was shortened and repitched. I repitched mine to a 71/48 when I converted it according to the Continental service bulletin 47-16 be sure the carb was modified and has the correct number and the correct size venturi and jet. the carb number should be stamped on the side of the carb flange. Check your static rpm for a c85. I now get between 500-600 fpm from a grass strip in the mountains 1400 ft. even on days with a density altitude of 3500 it still climbs good and I only lost about 4-5 mph cruise. I would rather get over a tree than hit it going 5 MPH faster. It made alot of difeerence in the performance for my airplane

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05 Nov 2015 20:24 #190 by Bud Bornemann
Bud Bornemann replied the topic: ercoupe performance
Sorry it took so long for a reply but had to get scheduled with a busy mechanic.
So the problem seems to be the prop. RPM about one hundred revs too low.
The prop is supposed to be taken off tomorrow and sent in to be re pitched.
Hopefully this will result in the increase in performance I'm looking for. Possible
lower cruise speed but improved clime performance. I'll post the results. Thanks for
your replies most helpful.

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13 Oct 2015 19:08 #159 by Bud Bornemann
Bud Bornemann replied the topic: ercoupe performance
Thanks, will check tomorrow and try to talk to mechanic.

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13 Oct 2015 14:05 #155 by James Good
James Good replied the topic: ercoupe performance
For reference, my O200 powered 415E is generally at pattern altitude (1000' AGL) by the end of my crosswind leg. At Nevada County airport, elev 3150'. That's with two medium guys on board.

-James. N94805.
The following user(s) said Thank You: Bud Bornemann

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