Non fate caso a discorsi strani l'ho preso da un forum (tank net):
http://63.99.108.76/forums/index.php?showtopic=18511&st=0&p=389404&entry389404I believe the only real difference between the DM63 and DM53 is a new propellant that is much less sensetive to temperature variations. The projectile of the DM53 is given as 8.35kg with sabot and the penetrator is said to be around 5kg. The muzzle velocity of the DM63 is slightly less than the DM53. 1650m/s from the L/44 and around 1730m/s or so in the L/55 barrel. So Muzzle energy would be around 11.4MJ from the L/44 and 12.5MJ from the L/55.
The total projectile weight of the M829A3 (come on guys it's a whole different critter than the M829, can't we come up with a new number?) is around 10kg. Estimating from the few cross sectional photo's I've seen the projectile looks to be around 920-925mm or so and the diameter a little bigger than the M829A2. I estimate a penetrator about 830mm, an L/d of 37 and a mass around 6kg. The muzzle velocity is usually quoted as 1555m/s. So Muzzle energy would be around 12.1MJ.
I get a perforation at 2000m into 800MPa RHA at 0deg / 60deg of:
DM63-L/44...........58cm / 68cm
DM63-L/55...........61cm / 72cm
M829A3...............68cm / 79cm
and for good measure
M829...................48cm / 57cm
M829A1...............54cm / 63cm
M829A2...............57cm / 67cm
The M829A3 is nearly 10 years newer technology (the DM-53 is of M829A2 era) with a significantly longer (924mm vs 745mm) & heavier (10kg vs 8.35kg) projectile. The estimates for penetrator the we at TANKNET have come up with for the M829A3 are ~800mm (possibly 825-830mm) long & ~7kg (for a 800mmx25mm penetrator). The DM-53 penetrator OTOH, we have come up with ~625-650mm long & ~5kg. Not to mention that the M829A3 is "super DU" vs the DM-53 being "super WHA".
While its ballpark calculated penetration performance using the typical equations we use is not much more than that for the M829A2, the M829A3 is known to be specifically designed for greater performance against heavy ERA. Certainly benefiting from many years of developement in this area vs the M829A2 & DM-53.
There are threads here in this forum that indicate that the penetration performance of the DM-53/L44 is in the same league as the M829A1/L44 & the DM-53/L55 is in the same league as the M829A2/L44.
IIRC the estimates of the DM-53/L55 penetration of ~800mm@2km was based on 2000m/s MV (we now know that it is 1750m/s).
You can shape a WHA penetrater any way you want, is does not match with the penetration capabilities of a DU penetrator
Penetrator of M829A3 Diameter should be 22~23mm.
M829A1
Projectile Weight 9.0kg
Penetrator Weight 4.6kg
9.0-4.6=4.4kg
M829A2
Projectile Weight 7.9kg
Penetrator Weight 4.7kg
7.9-4.7=3.2kg
M829A3
Projectile Weight 10.0kg
Penetrator Weight should be 10.0-4.4~10.0-3.2 kg
so the Diameter should be 22~23mm
DM-53
1990's technology (introduced ~1996)
745mm, 8.35kg projectile (including sabot)
1670m/s (from L44); 1750m/s (from L55)
M829A3
2000's technology(introduced ~2003)
924mm, 10kg projectile (including sabot)
1555m/s (from L44)
Do the math...
M829A3 (L44)
P/L = (1.044 x V(km/sec) - 0.194 x Ln(L/d) - 0.212) x (1+(d/6.5 x .05)) x (Penetrator Material Modifier) + 1.2 x d (2.4 x d for 60deg)
L = 830mm
D = 25mm
V = 1555m/s @ muzzle; 1455m/s @ 2km
Penetrator Material Modifier = 1.2
---
@ muzzle
P = 830 x (1.044 x 1.555 - 0.194 x Ln33.2 - 0.212) x (1 + (25 / 6.5 x 0.05)) x 1.2 + 1.2 x 25
P = 830 x (1.044 x 1.555 - 0.194 x 3.50255 - 0.212) x (1.1923) x 1.2 + 30
P = 830 x (1.62342 - 0.67949 - 0.212) x (1.43076) + (30)
P = 830 x (0.73193) x (1.43076) + (30)
P = 830 x 1.04722 + 30
P = 869 + 30
P = 899mm
@ 2km
P = 830 x (1.044 x 1.455 - 0.194 x Ln33.2 - 0.212) x (1 + (25 / 6.5 x 0.05)) x 1.2 + (1.2 x 25)
P = 830 x (1.044 x 1.455 - 0.194 x 3.50255 - 0.212) x (1.1923) x 1.2 + 30
P = 830 x (1.51902 - 0.67949 - 0.212) x (1.43076) + 30
P = 830 x (0.62753) x (1.43076) + (30)
P = 830 x 0.89784 + 30
P = 745 + 30
P = 775mm
--- *** ---
DM-53 (L55)
P/L = (1.044 x V(km/sec) - 0.194 x Ln(L/d) - 0.212) x (1+(d/6.5 x .05)) x (Penetrator Material Modifier) + 1.2 x d (2.4 x d for 60deg)
L = 650mm
D = 22mm
V = 1750m/s @ muzzle; 1640m/s @ 2km
Penetrator Material Modifier = 1.1
---
@ muzzle
P = 650 x (1.044 x 1.750 - 0.194 x Ln29.54 - 0.212) x (1 + (22 / 6.5 x 0.05)) x 1.1 + (1.2 x 22)
P = 650 x (1.044 x 1.750 - 0.194 x 3.38593 - 0.212) x (1.16923) x 1.1 + 26.4
P = 650 x (1.827 - 0.65687 - 0.212) x (1.28615) + 26.4
P = 650 x (0.95813) x (1.28615) + 26.4
P = 650 x 1.2323 + 26.4
P = 801 + 26.4
P = 827mm
@ 2km
P = 650 x (1.044 x 1.640 - 0.194 x Ln29.54 - 0.212) x (1 + (22 / 6.5 x 0.05)) x 1.1 + (1.2 x 22)
P = 650 x (1.044 x 1.640 - 0.194 x 3.38593 - 0.212) x (1.16923) x 1.1 + 26.4
P = 650 x (1.71216 - 0.65687 - 0.212) x (1.28615) + 26.4
P = 650 x (0.84329) x (1.28615) + 26.4
P = 650 x 1.0846 + 26.4
P = 705 + 26.4
P = 731mm
Nota sono calcoli approssimativi teorici però non molto diversi
se volete altro guardate nel link.