Your mixture control is not adjusted properly,
at 5500 with the mixture control pulled all the way back, full lean, the engine
should have almost died, check the linkage and the Mixture control system in
the carb it self.
Robert Q. Steinman, Ph.D.
-----Original
Message-----
From: John Bennett
[mailto:[EMAIL PROTECTED]
Sent: Saturday, July 19, 2003 4:53 PM
To: [email protected]
Subject: [COUPERS-TECH] Running
rough
|
Hello
Coupers,
I've had
2454H for about four months. I went flying this morning. The purpose
was to calculate fuel burn. After topping off the tanks, I took off and
climbed to 5500' and returned to the airport. I was at full throttle
until descent to land. Total time from engine start to stop was 00:43.
After topping off again with 3.15 gal of fuel, I took off and climbed to
4000'. When I reached altitude, I was at full power, indicating 122 MPH on
the GPS. My plan was to fly out for 00:30 and return. I tried to lean the mixture but
with the mixture pulled all the way out I only saw about one or two
hundred rpm drop so I returned it to full rich. I wanted to
descend to 3000' going back so I pulled the throttle back to 2100 rpm.
It started running rough. I went back to full throttle and it smoothed
out after a few min. By this time I'm heading back home. After
flying about ten min. I pulled the throttle back again and again it started
running rough and losing rpm. I went back to full throttle again and it
smoothed out for the most part. I will say that even at full
power, it still seems to run a little less smooth than it did. At one
point the rpm’s went down to about 1500. It was starting to
get scary but it smoothed out again and I kept my speed and altitude until
I was within gliding distance of the airport. By the
time I reached the airport it seemed to be running normally.
I am flying
a D model with, I believe, all the E up grades. C-85 engine, rudder peddles
and split elevator.
Can anyone offer an idea of what to look
for?
Thanks,
John Bennett
N2454H
|
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