Well, there's a reason why the Spitfires got part of their .50 cal MGs (was it just two, or four of them?) replaced by a pair of 20mm cannons, and it was not a cosmetic reason. A .50 cal AP round has a maximum penetration of 20-25mm, can't remember exactly now, for a 20mm gun that's the max penetration for the APHE rounds, but every other kind of round (except HE obviously) has more penetration power. Not sure what kinds were used in planes tho, I'm only certain about HE and APHE, the other classes might have been just for AT 20mm guns. About bullet's velocity, anyone knows if gravity and the inercial speed from the plane's movement have a noticeable effect on the bullet, making it (slightly in the best case, I suppose) more powerful than the same bullet fired from the ground?
A plane goes about 440 ft/s. A .303 round goes about 2600 ft/s. So, yes but not appreciably.
Be aware that firing the gun slows the plane down a bit as well.
DiosAbout bullet's velocity, anyone knows if gravity and the inercial speed from the plane's movement have a noticeable effect on the bullet, making it (slightly in the best case, I suppose) more powerful than the same bullet fired from the ground?
A bullet fired from the ground should travel at a lower velocity since the vertical component of its velocity would be reduced by gravity. That should make some difference, but not too much (the amount of difference would be influenced by the angle bullet was fired at, the more horizontal, the less change). Bullets from planes are still affected by gravity, but are most likely fired at closer range, and from a more horizontal position so would not be affected nearly as much.[/COLOR] [COLOR=black] [/COLOR] [COLOR=black]A greater difference would occur in accordance to the direction the plane is moving relative to the AA site. If the plane is flying away from the AA site, the velocity of the bullet will be less relative to that of the plane, so penetration would be reduced (difference in velocity would be used to calculate the energy and momentum of the bullet on impact). Conversely, if the plane was flying towards the AA site, there would be a larger difference in velocity, so the bullet would have more energy and momentum, making penetration greater.[/COLOR]
I pretend I'm cooler than AzH
3rd September 2005
Ivan Konevthat wasnt on the histoy channel was it? bit of advice if it was. ignore it.
yes it was. why?
Speaking of 20mm cannons mounted on planes, do they do anything to destroyers? I've made many passes over them but have always wondered if I was doing any damage, even a small amount? Anyone know?
Just because a show was on the History Channel doesnt automatically mean it was a bad show. Those shows are like WW2 books. Some are utter crap and some can be very informative. I happen to have enough knowledge on the subject that I know when they dont have the facts right. Some shows I have found informative and some have made me laugh.
There are a number of shows on there that are BBC productions. One of my favorites was the multipart show about select RAF pilots getting to fly Spitfires. Seeing that Spit flying and hearing that Merlin was sheer joy, bordering on but not as good as sex.
Probably not, FH destroyers are a bit heavily armored and too many hit points to be sunk by strafing Im thinking. I ahve sank them before with cannon fire but not with anything as small as 20mm.
IRL it would depend on what type of ammo was carried. IIRC most WW2 fighters carried HE or HE-I (high explosive or high explosive - Incindeary).