I'm hoping Scott from Van's will jump in here and offer some ideas for us.
Last Thur, my wife and I, after doing a run-up in our RV12 prior to take off (run-up and all engine gauges perfect and in the green), Proceded to the runway, added power, and started take off roll. Everything fine until moment of lift-off. Engine starting running real rough, lots of vibration, loss of power. I immediately pulled throttle to idle and landed without any problem. Taxied off the runway (engine running great now) to a safe spot, then tried to do another run-up. Engine ran great until just under 4000 RPM, then ran rough again. It feels like the engine is missing or not running on all 4 cylinders. Tried several times with same result. Taxied to hangar and shut it down for the day.
The next day, my partner beat me to the hangar, he started it and it ran perfect. Even up to full power. He even flew around the pattern and did a couple of T&G with no issues. My partners and I have flown it several times this week with no problems.
I want to add that concurrent with the aborted take-off the Ducati VR failed. We replaced it. However, engine was running good when my partner started it before replacing the VR.
So the question is, can you Scott, or anyone else, provide any hints to us as to what we should check or look for? Would the VR failure cause it to run rough? When we started it the next day with a bad VR it ran great. BTW, engine has 445 hours, same as plane. Certified Oct 2015. Partner and I built it. Running flawless since certified.
Bob
Last Thur, my wife and I, after doing a run-up in our RV12 prior to take off (run-up and all engine gauges perfect and in the green), Proceded to the runway, added power, and started take off roll. Everything fine until moment of lift-off. Engine starting running real rough, lots of vibration, loss of power. I immediately pulled throttle to idle and landed without any problem. Taxied off the runway (engine running great now) to a safe spot, then tried to do another run-up. Engine ran great until just under 4000 RPM, then ran rough again. It feels like the engine is missing or not running on all 4 cylinders. Tried several times with same result. Taxied to hangar and shut it down for the day.
The next day, my partner beat me to the hangar, he started it and it ran perfect. Even up to full power. He even flew around the pattern and did a couple of T&G with no issues. My partners and I have flown it several times this week with no problems.
I want to add that concurrent with the aborted take-off the Ducati VR failed. We replaced it. However, engine was running good when my partner started it before replacing the VR.
So the question is, can you Scott, or anyone else, provide any hints to us as to what we should check or look for? Would the VR failure cause it to run rough? When we started it the next day with a bad VR it ran great. BTW, engine has 445 hours, same as plane. Certified Oct 2015. Partner and I built it. Running flawless since certified.
Bob
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