The vis-viva equation models the motion of an orbiting body and it applies when the only force acting on the body is it's own weight.
So is it correct to apply this equation to an airplane that flies in a straight line at the Kármán line?
If it's correct, please explain why and if it's not, why not?
I ask this question because I'm puzzled by this question from @uhoh about the Kármán plane where the orbital velocity is used to determine the look of the Kármán plane.
v = 4 km/sec --> wing loading = 0,635
v = 3 km/sec --> ,, ,, = 0,31
v = 5 km/sec --> ,, ,, = 1,24
v = 6 km/sec --> ,, ,, = 2,53
v = 7 km/sec --> ,, ,, = 6,97