QUOTE(c150student @ Apr 21 2006, 11:27 AM)
Well, the T tail (with the elevators high up) on single prop aircraft wont get any of the propwash (I think thats what its called). I.e., at low airspeeds, a normal tail, with the elevator structure further down, will remain reactive (as long as there is high power) because the air from the prop is being pushed back quickly over the elevators, giving good pitch control. With t-tails, the wind from the prop goes under the elevators, meaning that they will become slightly more sloppy. But then, as I see it, aircraft designers would have a reason for giving each aircraft a particular tail, so its not a matter of whats the best, but what is the best for that type of aircraft.
t-tailed aircraft dont recover from stalls to well. and when they get into deep stall you better phone jesus. its not as bad with props because some propwash will still find its way to the tail(air expands as it slows so it will be a cone of air). With jets however(ldc-9 style jets) there is no chance of recovery if you stall it to the point of a tailslide(not ideal in any jet really but thats how i would describe your elevator doing absolutle nothing and the nose being over 40 degrees high).