Here is a dead simple one...
Who out there can tell me how tandem rotor helicopters (eg chinook ch-47 etc) are yawed around the normal axis?? I realise there is some type of control input going on but what is it and what effect does that have on the aircraft in order for it to yaw left and right??
All I can dream up is that moving the pedals(they do have pedals right??) results in some type of opposing lateral rotor disc tilt/bias between the front and rear rotors
ie - to yaw left around normal axis,left pedal in causes left `tilt` of front rotor disc and associated total rotor thrust ...and right `tilt` of rear rotor disc and associated total rotor thrust.
...opposite of above for right pedal
While on the subject of counter-rotating helicopter designs how the hell do you yaw/control kamovs and k-maxs around the normal axis??? (ie- turn around the mast)
Please enlighten me on what really happens in these beasties!!
