Wait... That's 9 dammit. 6 ÷ 2 = 3 (1+2) = 3 3x3 = 9 Why am I so stupid? I'm sure it has already been "proven", but whatever. Too lazy to read the entire thread as math is worth piss for me.
I have a small RC plane, that is just big enough for outdoor uses but already to big for using inside (50cm wingspan, 60gramms, 4x 20000rpm propellers). when the wind is too strong and I do a takeoff from throwing against the wind and then go full speed, it can happen that the plane goes upwards while moving backwards just like a childrens kite.
why - its only moving backwards in relation to the ground not to the wind? but i assume its hard to keep that controlled ...
The only thing that matters is the speed under the wings and the planes shape. May it be the speed the plain generates or the wind speed of a windy day. There is no relation to the ground.