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ercoupe performance

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07 Dec 2019 09:32 #7 by Ken Thompson
Replied by Ken Thompson on topic ercoupe performance
Gale, this is a four year old thread. FYI.
I believe that James intentionally cruises at reduced power. He has a 46 inch climb prop and cruises at 2350 rpm. He says he gets a GPS ground speed of 95 in calm air.

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07 Dec 2019 05:52 #8 by Gale York
Replied by Gale York on topic ercoupe performance
James, what prop do you have? Watching your YouTube stuff, I felt you were not getting good cruise. Maybe wrong, but I noticed a lot of 85/2350, and thought you must have a climb prop.

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13 Nov 2017 05:25 - 13 Nov 2017 08:30 #9 by Henry Pasquet
Replied by Henry Pasquet on topic ercoupe performance
I would keep it at 71 inches and reduce the pitch to a 48 or 46 inch to get the desired RPM. Less pitch, more power, more climb.
Last edit: 13 Nov 2017 08:30 by Henry Pasquet. Reason: update

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12 Nov 2017 21:11 #10 by Larry Snyder
Replied by Larry Snyder on topic ercoupe performance
A licensed prop shop can cut it down and even change the pitch if you want

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12 Nov 2017 20:31 #11 by Allen Deyoe
Replied by Allen Deyoe on topic ercoupe performance
Larry, can the prop be trimmed to a 70” by a prop shop and be OK with FAA Regs.

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02 Oct 2017 13:17 #12 by Larry Snyder
Replied by Larry Snyder on 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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