Curmudgeon in Training (CIT)
- Apr 13, 2009
- Warren, VT USA
What is the tradeoff and what regimes does this work in. Most of the modern VERY high speed fighters are using all flying tails that are all electromechanically mixed into all function of roll pitch and yaw in servo loops. But there is a lot of FBW divine intervention going on there. So at what speed and for what purpose, like avoiding flutter or PIO using mechanically connected controls with neutral stick force balance points does one avoid an all flying tail. I have been looking at Vtail all flying surfaces. Makes me wonder if the rudder vs. Elevator functions would interfere with each other? Orion?Possibly the biggest problem with an all moving vertical stab is structural... you'd have a large overhanging load on whatever pivot point you use. This is true, to a lesser extent, of a flying horizontal stabilizer as well. Anchoring the stabilizer rigidly at the front and the back has definite structural advantages, so it can be lighter... which may or may not offset the weight advantage from making the surface smaller, as Bill pointed out is possible.
A number of aircraft have used a tiny vertical fin and a large rudder with significant area (the whole top of the rudder) extending forward of the hinge line, to the leading edge of the fin... a large aerodynamic (and mass, if necessary) balance.
Earthlings: Send more probes. The last one was delicious!