As for strafing with an upward pointing gun - I was surprised to
discover that the USAF had forgotten all about high-angle strafe. I
was taught the technique at Nellis back in 1954. 60 degree dive angle
- designed to negate the advantage of a foxhole. At Da Nang I worked
up my own sight settings for 45 and 60 degrees and used the gun in 45
degree dive bomb passes to keep the flak gunners busy. With a little
work and a -34 one can derive a sight setting that works for both gun
and bomb (different release altitudes, though). Some conditions used
12 o'clock on the F4's 50 mil reticle for the gun and 6 o'clock or the
pipper itself for bombing. Amazing what a guy will do when bored . . .
but hell, they worked just fine.
Walt BJ