Made a single flight this morning with it, with an oS46FX and APC 12.5x3.75 prop. I don't like it (I have about 10 flights total with this engine). I had the same engine on my Madness before and it was fine. Seems like the Flip is more CG sentitive than the Madness and having the tank in the front make the variation too big to enjoy. The hovering is tough to hold at the beginning of the flight when the tank is full, then it gets easier and easier as time and fuel goes by. By the end, it is relatively easy but then, you are playing with fire since the tank is almost empty.

I want to change to a YS63 and place the tank on the center to reduce the CG variation. The OS46 is out!!

Ben