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ercoupe performance

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13 Nov 2017 05:25 - 13 Nov 2017 08:30 #1285 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 #1284 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 #1283 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 #1213 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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30 Sep 2017 18:47 #1207 by Allen Deyoe
Replied by Allen Deyoe on topic ercoupe performance
Larry, it appears I have a McCauly CM7346 the standard prop for a 75hp. That means I have longer prop than your recommended size. I would think 46 would be a climb prop. What would you suggest I do?

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29 Jan 2017 17:43 #799 by Tim Treat
Replied by Tim Treat on topic ercoupe performance
o-200 crank stc and a 48 pitch is a rocket ship ;)

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