Hi.

While flying my Hobbico Hobbistar 60 (using an OS .65 LA engine), my engine is showing a trend of stalling (completely stopping) after only a few minutes of flying. The fuel tank is full when I take off and easily lasts 10 minutes normally. The engine seems to stop after I climb vertically and then then pull the throttle back to near idle and use the vertical stabilizer to turn the plane so it's nose diving. The idle is fine (I assume) because it idles fine on the ground or at level flight.

I believe the fuel mix is ok, but I can't think of another reason why the engine is stopping. Could the engine be too lean or too rich? Could the fuel line not be reaching the fuel while I'm in a nose dive? Any suggestions?