I mean PKM.Werewolf wrote:
You sure you mean the PKM?
Maybe you mean RPD or RPK?
GarryB wrote:I think you are asking about the AK and the RPK, where the latter is just a larger heavier longer barreled AK.
Sorry Werewolf and Garry, I missed your answers. Because I had had problems to access to my previous emails, when I accessed I had to read several dozens of notifications, then your very interresting answers were drowned among the others. For that reason I forgot to answer you.
I used to think that the new Bulletproof vest's kevlar -AR500- could stop any 5.65 and 7.62 mm rafales and I used to think that russian assault rifles as long as RPK, and PKM's LMG does not have future. As I read somewhere the new incoming Bulletproof vest could resist until 12.000 joules, and could resist even against 12.7 mm that produce around 12.500 joules.
My -false ? tell me if Iam wrong- assumptions came from these videos :
It shows that the actual 7.62x39 mm -I don't know if the RPK, or PKM are concerned- are useless against body armor level III. For this reason I thought that all assault rifles, and russian LMG could be useless. But I forgot one important thing. This Body Armor was designed during 2000's, however the chinese amnutions AP -showed in these videos- were designed before the 60's. Chinese 7.62x39 mm AP were effective during the 60's, but obviously not nowadays. As Garry, and Werewolf said before, meanwhile the body armor's technology advances, obviously the technology of amnutions evolves in the same way too. I will be curious to see the new chinese, or russian amnutions ap -if they exist of course- nowadays. .
Moreover, I forgot another critical details. The velocity of the 7.62 could reach 750 m/s, however the AK-74's 5.45x39 could exceed 980 m/s. As the Energie is (M/2)xV², in english Kinetic energy gives the well knwon formula Ec=Ek = ½mv² the AK-74 could produce more energy than the 7.62. It gives 1500 joules for the 7.62, and could exceed 2200 joules for the AK-74 5.45 mm. Enough against this ARM ?
Moreover the Maximum pressure gives 380.00 MPa for 5.45 mm, meanwhile 355.0 MPa for the 7.62 mm.
As we observe, the square of the speed is more important than the weight. Hence the caliber's size and the mass is less important than the speed of the projectile. The most issue is the speed. If russians, or US could produce amnutions that overpass 2000 m/s, and reach 3000 m/s I think no body armour could resist. Does it exist in russian's arseanal any 5.45/7.62 -including RPK, PKM, etc...- that could reach 1.800 m/s ?
PS :I think any ZPU 14.5 mm could without problem perforate any Body armour as it produce until 32.000 joules. But to have a cumbersome ZPU is not optimal in combat areas