I noticed when I first started, the Flyzone Skyfly couldn't get off the ground the physics sucked.
I took the liberty of fixing that and I have created the FlyZone SkyFly2.
I gave it an engine that is close as I could get to the real deal but it still flys somewhat faster than I predict the Skyfly can go. I have a skyfly, but the winds have not yet been in my favor to fly it but I saw videos online of it being flown to get a feel for the Skyfly.
Only thing i did was change the Engine and make sure the skyfly was proportional.