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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 rpms 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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