That sounds like bullshit though, the bullet would have the same speed when released from the shell in addition to speed generated by the blast in the shell. Did the plane fire and then accelerate enough to catch up to the bullet? That's pretty convoluted and unlikely, you would have to actively try to shoot your own plane.

EDIT: The dumbass shot at a slight down angle and then engaged the afterburners. Skill Issue.

[–] merc@sh.itjust.works 15 points 8 months ago

Yeah, the initial velocity of the bullets would be the sum of the plane's velocity plus whatever velocity the bullets gain coming out of the barrel.

But, what apparently happened is perfectly believable (if extremely unlucky). It's not that the F-11 was faster than its bullets, it's that it flew in a way that its path intersected the path of the bullets it had fired. As soon as the bullets left the barrel they would have started slowing down, eventually ending up on a ballistic trajectory. The F-11 would have stayed at approximately the same speed, but if the pilot hit the afterburners it would have sped up considerably.

Still, the likelihood of the speeding up plane hitting the slowing down bullets is extremely low.