TimApNy wrote:
I think I was suprised at how random they were and how few. But it makes sense if you really think about it.
As I tell my students, air-to-air gunnery isn't accomplished with a sniper rifle, but with a chainsaw.
Given the many aiming errors in aircraft guns (installation error, aircraft pitch/yaw and vibration in flight, gun vibration and recoil while firing, boresight error in the gunsight), it's a wonder that any bullets hit anything!
In the F-15 and F-16 the M61 20mm cannon, which has some very gee-whiz high-tech methods of compensating for all those errors, even has a 4-5 mil (miliradian) dispersion pattern. That means at 1,000 feet slant range to the target (if the gun was harmonized/aimed at that distance) 80% of the bullets would go through a hole 4-5 feet in diameter.
Think about that.
80% of the bullets through a 5-foot diameter circle just 1,000 feet in front of the jet.
At the distance where jet guns are aimed (typically 2,250' to 2,500' in front of the jet) that hole is more than twice as large; 11 to 12 feet in diameter. And 20% of the bullets are hitting
outside that circle.
So if you consider that in WW2, they were shooting with basically iron sights (even the gyro sights were pretty low-tech compared to current radar-ranged and geometry-compensated gunsights) it's a wonder they hit *anything*!
That's why Erich Hartmann's advice of waiting to shoot until the enemy fills your entire windscreen is a good bit of advice from a gunery standpoint (but a VERY POOR bit of advice for every other aspect of dogfighting!!).