Alan,
That performance certainly does not sound like an M-10 to me (judging by
what I've seen of Alon performance with the same canopy and engine).
Is your prop within specs for the M-10?
See The M-10's Type Certificate Data Sheet A-787 and page down to props.
Check the allowed props for that plane and engine and the static rpm. It
seems like you are WAY low on static rpm. This could be due to an
excessively coarse pitch on the prop or a weak engine.
Me, I'd check the prop as I don't know how to check that an engine is truly
putting out proper power. I guess you could take a prop off a matching
airplane/engine and put it on yours and see if you get the same static rpm
as the good flying airplane. (I'm not a mechanic and MUST NOT play one on
the Internet!)
Here's one segment from A-787:
______________________________
Fixed pitch metal, McCauley 1A90CF or 1B90CM +12 lbs. (-32)
Eligible on Models M10, A2, A2-A, 415-D (per note 4(b)), E, G, F-1 and F-1A.
Static r.p.m. at maximum permissible throttle settings:
For Models 415-D, E, or G: not over 2225, not under 2025.
For Models M10, A-2, A2-A, F-1, F-1A: not over 2375, not under 2250.
No additional tolerance permitted.
Diameter: not over 71 inches, not under 69.5 inches.
______________________________
As you can see, if you have one of these two props and you're only getting
1900-2100 rpm when doing a static test (i.e. no wind or exactly sideways to
a mild wind), then you are way below specs. (But, you knew that from the
abnormal performance.)
Still, we don't know if it's caused by the prop or the engine.
Please do read through A-787. I link to it from my Coupe web page:
http://edburkhead.com/Ercoupe/index.htm
Ed
Ed Burkhead
http://edburkhead.com/Ercoupe/index.htm
ed -at- edbur???khead.XXX change -at- to @, remove ??? and change XXX
to com
