Friday 2010-04-09 Discussion Thread

[DK-nme]

Originally Posted by Skoshi Tiger

I think the .303's are porked!

All the bullet holes in the 17 are round, which means the .303 rounds were all fired at 90 degrees, Now unless the Dornier was stationary the holes should be oval.

Now the 175 grain .303 round is 31mm in length and travels at about 2445 foot per second (at the muzzle) which works out at about 745725mm per second, so it takes about 0.000042 of a second to travel the 31mm from the tip of the bullet to its butt!

Now lets say the Dornier is traveling at 300km/h thats about 83333mm per second

So in the 0.000042 seconds it takes the bullet to travel the 31mm the plane will have traveled about 3.5mm, so the bullet hole from the .303 round should be an oval about 7.9mmx11.4mm.

Nonsens. The angle of attack is the only factor, that has anything to do with the form of a bullet hole - or did I just miss something (like this being for fun?)


DK-nme

[Skoshi Tiger]

Originally Posted by DK-nme

Nonsens. The angle of attack is the only factor, that has anything to do with the form of a bullet hole - or did I just miss something (like this being for fun?)


DK-nme

Yes it is for fun but in some weird wisted way it makes sense.

The the aircraft and the bullet have different vectors. It takes time for the bullet to pass through the skin of the aircraft. During that time the aircraft moves (about 3.5mm from my rough calculations). Therefore due to the momentum of the bullet and its physical properties that make it want to continue on its path, the holes should not be round.

What I did not factor into my calculations were the acceleration imparted by the skin of the aircraft onto the bullet, nor the fact that the .303 bullet was designed deform and tumble after impact to impart it's energy to it's target, both of which goes towards my original statement.

It's times like these we need Raaid to explain things on this forum!!!!!

Cheers!

[DK-nme]

Originally Posted by Skoshi Tiger

The aircraft and the bullet have different vectors. It takes time for the bullet to pass through the skin of the aircraft. During that time the aircraft moves (about 3.5mm from my rough calculations). Therefore due to the momentum of the bullet and its physical properties that make it want to continue on its path, the holes should not be round.

This makes sense. And again, is a matter of angle of attack (bullet and plane vectors and or trajectories).

And no, I don't think mass of bullet, velocity, skin hardness and angle of attack (deflection) will ever be modelled in SoW...


DK-nme