This is my "replica" of a helicopter called the N900. It is a replica if you don't pay attention to the wings and extra stuff a helicopter doesn't have. The only reason those things are on there is because Simple Planes physics just never want to work with you. Also it works almost exactly as you would expect a helicopter to work...but it does some occasionally backflips here and there. Instructions on how to take off.. Click one on the activation group before you get off the ground, after you have done so, set the power to 100% and once you get to a certain height off the ground (probably 5 seconds after it gets off the ground) click activation group one again to turn it off and start flying!