Any idea why I would have lost power on the third flight. The glow plug was still in good working order after I took it out, but I swear I lost power. For the first couple minutes of the flight, the engine was strong, but then lost some of it umph. Maybe the bubble thing again (I would think I would gain a bit of power if it was lean and still running)? Would it help to put padding in contact with the tank even though it would still contact the airframe?