20mm round identification

[7X57chilmau]

Dang....

 

[Zoogster]

Whelp I can tell you apparently 3500 ft/sec into sand won't do the trick.

Don't forget to add the velocity of the aircraft it was fired from. They tend to strafe going fast.
An F-15, F-18, or F-16 going 900 MPH during the strafe for example is going an additional 1320 feet per second. Those are around realistic speeds from which they could be firing at ground targets with the cannon.

That 1320 feet per second would be added to the initial muzzle velocity of the projectile.
So I would add at least another 1,000 feet per second to the muzzle velocity of the round itself when fired from such aircraft platforms.
The round would also be working with gravity, and those large rounds have a very high ballistic coefficient. So they lose velocity slowly.

 

[Fabio760]

they were found on public land right outside of neighboorhoods just a ways into the desert so its not like I went into a military base, the only one here is MILES from where they were found so I see it as fair game since all it really is, is chunk of shaped metal Right? But to clear it up only the round was found, no cartridge.

But final answer as to whether it goes boom or not is no correct?

Are the two pieces separable?

Thanks, again.

 

[Owen]

That 1320 feet per second would be added to the initial muzzle velocity of the projectile.

I'm no pilot, but I don't think strafing ground targets while supersonic is typical...

 

[Zoogster]

I'm no pilot, but I don't think strafing ground targets while supersonic is typical...

It depends on the ground situation. You would strafe as fast as you can get away with while being reasonably accurate to avoid taking fire from the ground.

Slowing down significantly below what is necessary for the safety of the aircraft at that altitude puts you at greater risk for taking ground fire.
Those aircraft can go near that speed at sea level (where the atmosphere is denser, they can go faster at higher altitude) and so why wouldn't they in a combat situation?
If you are going to train one should train close to like you are in combat, so strafing at only slightly slower speeds (don't need to be at the limits of the airframe just for training) during training would be ideal.
900MPH is high, as they need to be below thier maximum maneuvering speed for that altitude.

1,000 feet per second more is 681 miles per hour, which is below what those aircraft can do at low altitude. So adding another 1,000 feet per second to the muzzle velocity of the projectile from a higher altitude attack seems quite reasonable to me. They usually go around 500 mph when just skimming the surface for a strafing run, which is still an additional 733 feet per second to add to the projectile speed. Certainly faster when not skimming the surface.

 

[jaymac]

http://www.globalsecurity.org/military/library/policy/army/fm/4-30-13/appf.htm

 

[WC145]

As a general rule, taking something apart to prove that is non-explosive runs the risk of disproving that hypothesis in a spectacular way.

People string words together all of the time but it is seldom that it's done with such eloquence. Excellent use of the written word, just reading that sentence makes me smile.

 

[rbernie]

Why do they show no rifling engraving?

 

[Fabio760]

Well my project can now go on, I drilled into 3 of them and didn't blow up