Wizzard said;
Basically, in a fixed wing aircraft you take your hands off of the controls and say "look, no hands!" In a helicopter you take your hands off of the controls and say "look, NOOOoooooo!"
Hendrick FOCKE said;
"... hovering, the longitudinal oscillations .... values of 12 seconds were ascertained. With this time of oscillation of a dynamically unstable character, the helicopter could be flown without difficulty.
The Fa223 is statically and dynamically completely stable around all axes other than the longitudinal one. At traveling speed of 140 to 150 km/h all controls can be released, because longitudinal instability disappears at about 120 km/h. Then this aircraft behaves just like a normal airplane and is automatically stable.'
The Fa233 -->
http://www.luftarchiv.de/index.htm?h...uber/fa223.htm
Who said that helicopters MUST BE unstable?
Who said that helicopters MUST HAVE a single rotor?
