I've recently been working on this behemoth, but I'm reaching the limits of my own capabilities and that of my iPhone, making it virtually impossible to troubleshoot. The basic features are all there, usually I would now add some more details and work on mid-air stability. But particularly that last part proves to be a pain in the butt at 2 frames a second.

Other than a natural tendency to roll a bit, it shouldn't be too bad from what I can determine on my device, but I have now decided to hand this bird over to the community and let you have fun with it. And if you can correct the rolling issue, all the better. Cheers!

Pull down the VTOL lever to retract the landing gear.