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Ercoupe gross weight STC possible?

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12 Jun 2021 10:16 #1 by Larry Snyder
Replied by Larry Snyder on topic Ercoupe gross weight STC possible?
He said he had a C-75 which uses a 73” prop, which is not legal on a C-85

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12 Jun 2021 09:49 #2 by William James
Replied by William James on topic Ercoupe gross weight STC possible?
Larry , explain the

"new prop" requirement.
I have the 85hp change and a McCauley 7150 prop which I bought new 3 years ago .

Thanks

Bill James

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11 Jun 2021 13:46 #3 by Bruce Bennett
Replied by Bruce Bennett on topic Ercoupe gross weight STC possible?
Chris, changing the trim tab from the original 3/4" to the 1 3/8" trim tab is all that is necessary on the 75 hp to raise the gross weight to 1320 lbs. Ref Univair STC SA02450CH. Far cheaper than buying a different prop. One can either add a trim tab extension (p/n 415-22031-4) or replace the entire trim tab (p/n 415-22031).

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11 Jun 2021 08:57 #4 by Larry Snyder
Replied by Larry Snyder on topic Ercoupe gross weight STC possible?
Pretty simple mostly paperwork and a new jet for the carb. Same engine, basically.
The following user(s) said Thank You: Chris Longfellow

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11 Jun 2021 08:46 #5 by Chris Longfellow
Replied by Chris Longfellow on topic Ercoupe gross weight STC possible?
Thanks Larry, yes that was my next question... how involved is the C-85 conversion (aside from the prop)?
Any articles in Capers or on this site which can help?

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11 Jun 2021 08:39 #6 by Larry Snyder
Replied by Larry Snyder on topic Ercoupe gross weight STC possible?
It can be done. 1320 with a 75 is a little tricky, imho. You can always upgrade to a C-85. Of course that means a new prop…

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