VELOCITY: Rifled vs. Smoothbore

[Gametracker]

[quoteBut you said fired under identical conditions and a condition would be an identical trigger pull. try again...LoL! [/quote]

Impossible! Identical conditions would mean the same occupied place in space. that condition requires one at a time :blah:

 

[adbranaman]

How can the Chronograph measure the speed of the projectile untill after it leaves the barrel? I guess this is nit picking ,but it might make a difference.

 

[Joel/Calgary]

I thought that the smoothbore on the tanks was because of the speed of the round was faster than could be stabilized with rifling. That round is going out at over 4500 fps whitch is somewhere near max for a rifled barrel.
Lehigh..

That's true it's well over 4500 fps (with APFSDSDU rounds) :: and it is stabalized by fins on the rounds. I didn't know that there was a maximum velocity that could be stabilized by rifling, but I'm sure that rifling slows the round.

I don't have the details at hand, but I recall it having to do with the rate of spin required for that extremely long peneterator - it's more like a sharpened crowbar than a bullet - and the deleterious effects of the precession on accuracy and/or of the spin itself on penetration (the penetrator bends/breaks up much more easily). The British 120mm uses a rifled bore for better accuracy with other types of rounds; their APFSDS round uses a slip ring instead of a rotating band so it gets almost no spin.

ff:

Joel

 

[waksupi]

Interesting thoughts. I do know we have extreme difficulty pushing cast bullets beyond 140,000 rpm's. After that, you really have to do some tweaking. I would imagine harder projectiles will stand for considerably higher rpm rates.