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Bobby, my map is ( was ) still set to factory with all bars in the center, after landing I thought to check EM2 screen with mapping bars & discovered half were still at center & half were all the way to the bottom/lean. I had not changed anything for aprox. 15 min. of flight, then suddenly ruff running. I just responded to Mark & mentioned that the only thing diff. from prev. 10 hrs. was I had both landing & taxi lights on this flight. David
From: "Bobby J. Hughes" <bhughes@qnsi.net> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Thursday, August 22, 2013 6:20:32 AM Subject: [FlyRotary] Re: Fuel map scrambled. David
If you recorded your fuel map values you should compare each address to those numbers and see if they have changed or become corrupt. It could be fuel pressure / regulator problems, manifold pressure etc.
If you adjusted your prop when the problem happened then you could have hit a address that was not tuned on the ground. Not likely. I do all ground tuning with prop set for 2100 rpm in fixed pitch mode.
My finger is always close to the controller A/B switch during takeoff and initial climb. Fuel mixture is number one on my check list and A/B switch is number two.
Glad you made it down safely.
Bobby Hughes
Sent from my iPad
1st..... am now on the ground safe & sound, no damage normal landing. The story goes....... Level at 2500' above Mason Jewett Field, ( hazy evening, aprox. 7:30 pm ) on the down wind abeam of the end of the runway, 4600 rpm, ? MAP, 125 MPH ind., 3rd circle around the patch getting ready to put in full cruise pitch on prop to do a full throttle numbers gathering. Then the eng. started running very poorly, missing, stumbling hard, destict loss of power, tryed to descend & come around to land but am high & hot with ( RV's need air brakes ) eng. smoothed out, chose a sweet spot & climbed out to go around,,, low but climbing, ran smooth 4000 rpm, landed ok. Before shutdown, checked fuel map bars for EC2 on EM2, some in the middle some at the bottom,,,Lean,,, why did the fuel map scramble suddenly, steady cruise flight, made no changes at that time? At the airport by 6:30, pull plane from hanger to do two tests tonight, 1st. run eng. at low power/idle like sitting in line for takeoff from Osh or ?, how long can we stay running without getting to hot, 18 min. coolant 205 F, oil 175 F, ok that's good enough for me lets go fly & do the prop full cruise pitch test run. That was the start of the evening, ended differently than I would have liked. But nothing bent. Did not reset EC2 yet, am going to start eng. & check to see if computer B runs ok, did not get a chance to throw that switch, when I found the sweet spot I changed nothing, just came around & landed. What is the fix for this anomaly?? David R Cook RV6A Rotary
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