You don't see this to the same degree in deltas with
tails or moving canards, like the MiG-21, Typhoon, Rafale,
Gripen, etc.
The Mig-21 would (does?) bleed energy like a big dog at high alpha. A
canard will have a positive impact versus a conventional horizontal tail
because of its lower drag contribution to generate high alpha.
R / John
|