I have a Zagi as well and had launch problems until I made a "finger hole" in the bottom of the wing about 8 inches back from the nose. I epoxied in a small plastic pipe in the hole for reinforcing. For launch, I use my right hand and stick my middle finger (yes, middle finger - stop laughing) in the hole and throw the plane level at full throttle. I also dial in about 1/2 up trim for the launch. This works perfectly every time. I am using the stock 1700 mah battery pack and the stock 6V 400 motor. No need for brushless.

Regarding props, throw away those stupid white Graupner props that come with the kit and use an APC 5.25 x 4.25 E prop. This gives much better performance. Trust me, I am a pylon racing guy when I'm not flying my Zagi. I know props. The performance increase is about 30% improved. I can do loops from level flight no problem. Couldn't do that with the Graupner prop.

In Summary, use the finger hole, toss it level, dial in 1/2 up trim and use the APC prop.

R. Smith