I have a C-90 in my 415-C and it produces around 2400 to 2500 rpm and
much better
climb than that. I checked my prop and it indicates 100 rpm high.
Dan Caliendo
Ercoupe Mach 0.14
3658H
On Mar 30, 2009, at 6:39 PM, alanrayj wrote:
Let me begin by saying I realize ercoupes and M-10's are not racing
aircrafts, and I did not buy one for that purpose. I love vintage
aircraft and it is a joy to fly an M-10, but the only aircrafts I
have flown before have had 180hp Lycoming engines and I am
wondering if what I am experiencing with my M-10 is normal. And
this group is the perfect forumn to answer my questions being new
to ercoupes and M-10's The M-10 has 850 hours since the last major
overhaul and the annual was done in December with no problems
documented. It still has the original Continental C-90-16F engine.
My M-10 rpm's max out at 2000 to 2100 at take off.(redline for the
rpm is 2475rpm) My field altitude is 600 feet and the temperature
has been averaging around 40 to 70 degrees F with winds of 5 to 10
knt. This is enough power to become air borne (according to the
original POH lift off or rotation should be at 50 mph) which is no
problem. After I become airborne my Vx and Vy are only 100 to 200
feet a minute to reach pattern altitude at this max rpm of 2100
rpm. Is this normal.
The problem is the aircraft seems sluggish (it sounds like a radial
engine which I actually like, and I saw no visible problems with
the exhaust) and the aircraft will not get above an rpm of 2100 to
2200 rpm. This is within the green arc of the rpm but seems
sluggish at take off and climbing to pattern altitude. Climbing to
cruising altitude of 2500msl to 3500msl the airplane will maintain
rpms of 1900 to 2100 and climb at a rate of 100 to 500 feet per
minute.
Is what I am experiencing normal or do I have a problem that needs
to be corrected.
Any help with these questions will be appreciated.
Alan
