I flew the intro two flights yesterday evening and the extra thrust was noticeable with about a 100 ft takeoff run and it came off on its own. Vertical climb was better but far from unlimited. A couple people commented that it sounded better (More like a jet) with the one piece tail cone. It's a bit louder now but a lower pitch, more of a rumble than the original whine. Will try to get some better video with the improved thrust and using a tri-pod for the camera.

I have the flightworks pump and have had good luck with it so far.

I will work on getting the front of the case sealed better but from everything I've seen and from my own experience it seems that 11lbs thrust is about par for a stock jj1400. Hopefully Joe has continued to improve the design and the new engines are putting out closer to 14 lbs. For reference, mine is S/N 751

Mike