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Ercoupe O-200 STC Prop question

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02 Oct 2025 16:41 #1 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
Even with the 0-200, my Forney likes the runway. I would not trade my take off run for cruise speed. Mine is a 1400 gross weight machine with more panel than any Ercoupe deserves and weighs in at 1006 pound empty save for 5 quarts of oil. I m not sure how much weight the 0-200 adds over the original C-90, but it is a little on the fat side.

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29 Sep 2025 19:47 #2 by Brooks McNew
Replied by Brooks McNew on topic Ercoupe O-200 STC Prop question
I've always wondered about this issue, thinking, "If I ever got my hands on a nice O-200, what about the propeller issue?" because the 6948 is known to be a pretty seriously climb-oriented prop that's easy to overspeed in cruise.

I did notice that there's apparently an additional STC to install a 69CK-0-52 cruise propeller - which sounds really interesting but... it's brutally expensive!

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27 Sep 2025 11:13 #3 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
Randall. I found a document which may be the field approval although I can’t say Inhave ever seen one which applies to my serial number only and includes a flight manual supplement provided by the Atlanta , Georgia filed office. So I guess I am good to go. Mike. ( Frank is my partner/brother).

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27 Sep 2025 11:00 #4 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
It was part of the STC as far as I know but will have to research it. Frankly, I don’t care and no one else seems to. Was just annualed in August. It hits static rpm and flies well. The only difference is the pitch. Let me do some looking.

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24 Sep 2025 11:00 #5 by Randall Hirsch
Replied by Randall Hirsch on topic Ercoupe O-200 STC Prop question
Frank any field approvals in your log history for the prop? This Ercoupe had the 6950 at the time of purchase and had been through many Annual inspections without issue. This IA was the first to catch it. I suspect there are several others in the field that may have the same issue.

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24 Sep 2025 10:40 #6 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
Mine is a 6950 and works just fine. I bought it that way for what it is worth.

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