Long story short, I built a Dash 5 pattern ship and have 4 flights on it now. The 61RF is mounted inverted with a pipe and runs like a scalded dog on the ground.

First flight went great. Second and third flight the engine started to surge a little and dead sticked. I had a kwik fueler rather than a fuel dot and figured it was sucking air causing the surge so I changed it out and put a plain old fuel dot onboard.

Ran the thing on the ground with a different prop and tuned it up. Strong as all get out and no surge with the fuel dot so we took it up to see how it would do. Flew great for about 2 minutes and it just died. No surge, just quit on me.

Now I'm trying to figure out why it runs great on the ground but each time it's been in the air, it quits after a few minutes. Anyone have any suggestions? I'm open to just about anything at this point.

Thanks. Paul