Ercoupe O-200 STC Prop question

Already talked to Alpha, he said that back in the day they were just pulling engine and prop combos off of pre-1972 C-150's and the STC was written for that and just listed the C-150 prop for simplicity. He suggested that we talk to a prop shop.

I just figured somebody out there also has a different prop on their O-200 Ercoupe.

I’d call Alpha Aviation and ask. I know that many complaints I’ve heard in the past about the O-200 STC was the limited choice of propeller that does not let you take full advantage of the engine.

Using a new IA this year for the annual inspections on my Ercoupe and my friends 415-D with an O-200 STC.  This IA noticed that the STC (STC SA2628WE) specifies only one prop a McCulley 1A101/DCM 6948.  This 415-D has a 1A100/DCM 6950 - which is fine for the O-200 and is listed on the TC for the engine, just not in the STC for the O-200.

Has anyone else run into this issue before? Is everyone out there with an 0-200 running a 1A101/DCM 6948?

Thanks,

Randy Hirsch