it's a 4 bladed fully mechanical collective pitch Helicopter that was made BG, before the gyroscope with no mods, or at least at first, I did have to mod the engine's in the end to make it useable, but trust me, It was able to fly with out mods, but just barely, and if you tried to go anywhere it would usually be too heavy and under powered for it's weight and fall, luckily I found some lighter modded vtol engines and got it to fly with out any problems at least in weight. It does like to roll to the left in forward flight though and you will probably completely loose control of it but the amazing thing is that it works and can fly for a While if your carful all while having no gyroscopes at all. and it controls like a quadcopter with a collective that doesn't like to stay straight when in forward flight. so... to fly it, put the VTOL slider all the way up, and slowly increase the throttle till it lifts off, then it flies like a quadcopter, but it doesn't go back to center on its own, you have to control that. Also all inputs are mechanical so don't expect it to fly after a hard landing that breaks a strut, because all the parts will lock up. and no it doesn't fly perfect or really well at all but the fact that it can or at use to with out mods is good enough for me!!! so, Enjoy!