Originally Posted by
FullWings
If you are sliding down the runway on the engines and attempt to get back in the air again, there would be considerable differences in the potential aerodynamic and other forces/couples compared with a normal rotation - how much AoA could you generate with the tail on the ground given the fuselage is much closer to the tarmac?
A quick back-of-the-envelope bit of geometry would suggest that about 5.5° of pitch attitude is achievable with the engines in contact with the runway, before the tail hits the deck.