Why would a designer use a T-Tail? (In light of the negative stall characteristics of T-Tails)
- Because, for various reasons, there's nowhere on the aft fuselage to put a tail (aft mounted engines, for example, or a rear cargo door) OR because the downwash field directly behind the wing is unfavourable and its better to get the tail up and out of the flow, even at the expense of deep stall
- also, if the fin is swept, a T-tail can end up further aft, so gaining 'free' tailplane moment arm.
What does a T-Tail do to stability, and why?
- changes rudder and fin effectiveness (endplate effect)
- causes mach issues with the fin/tail junction
Why does the C-5 have a high wing?
- underwing engines & low cargo floor
Is the stability influence of the T-Tail the reason for the anhedral on the C-5?
- may be loading. rolling moments induced by tail on fin can be significant; tail anhedral can reduce this effect