Almost certainly for L27, maybe not Strictly L27A1, but 99% its L27 in its prototype stage.
Wouldn’t the increase in length mean a much better penetration using “the formula”?
should be around 1988-1990
Also note the 700 target is not a slab of RHA, its a complex target representing 700mm RHAe
Also whatever that guy wrote after a google translate
Spoiler
Re-evaluation of Britain’s magical armor-piercing projectile CHARM3 (L27)
[Figure 1] L27 is estimated to be the highest running bomb with known technical indicators [Doraemon is afraid]
As we all know, the performance index requirement of CHARM3 is to penetrate 700mmRHA equivalent armor steel at 2km [Figure 2, Figure 3, Figure 4]. In a document, it was also intentionally emphasized that the vertical target performance does not meet the CHARM3 index for M829A1 [Figure 5], but later For some reasons, vertical penetration is no longer important and is no longer mentioned. The British are very sure that the 21℃2km700 penetration indicator is met [Figure 6].
Generally, British archives are very secretive about some key indicators of CHARM3, such as muzzle velocity. Therefore, the outside world has been unable to evaluate the specific performance of L27 for a long time. Now the last piece of the puzzle to meet the necessity has been completed.
L27 is a stubby, low-speed heavy projectile. The current technical parameters are shown in [Figure 7, Figure 8, and Figure 9]. The projectile mass is 9.5kg. When launched by L30, the muzzle velocity is 1585m/s at 48°C, which means normal temperature The muzzle velocity is only a little over 1500 (estimated to be 1510~1550m/s. The decrypted file actually deleted the key parameters of CHARM1/2 and CHARM3 in the first half of the technical table, but forgot to erase the high temperature muzzle velocity in the attachment), which is 2km. The speed is only 1400+, and considering the core parameters of 5.2kg-605/26, we can basically judge that the inclined RHA target plate used for acceptance is most likely 150mmNST, the inclination angle is close to 77.5 degrees, and the hardness of the target plate is not very high. The possibility of a target plate larger than 200mm is ruled out (but it does not rule out more amazing operations, such as switching to softer target steel, time will tell anyway). (There are 5 types of acceptance target boards, 2 types of RHA target boards are vertical targets and oblique targets, and 3 types of special armored targets)
Compared with other NATO 120KE bullets participating in the bidding, the performance of M829A1 on RHA targets is actually worse than that of L27. After all, in addition to the weight of the bullet, the muzzle velocity and core length of L27 are completely inferior to M829A1 (21℃ 1575m/s, 4.64kg-680 /22)[doge]. Excessive target plate inclination may make the L27’s thick core more effective, but according to the empirical formula M829A1 is significantly better in all inclination angle ranges, so there is a question mark as to whether the test standards are unified.
However, if you put aside the power of RHA and only look at the effect on specific targets, L27 should be able to achieve the goal of penetrating FST-1/2 (T-80U) very well, because it has a high probability of not detonating K5 at high speed. , and the T-80U’s upper basic armor is only about 500mm RHA equivalent, which can be penetrated by both M829 and DM33. The L27 naturally has no pressure on it.
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Complex targets are usually Soviet tank mockups correct?
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Again, RHAe - so not RHA and exceeds is not a definitive number.
Yes, and if this target is assuming a value for k5 and L27 can mostly ignore k5 then the performance against non ERA targets would not be 700mm
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the point being it exceeded the requirement later in develoment, meaning those values of 605 etc… are not accurate to the finished round.
You don’t really know that, they could also have increased the MV past the extremely low figure from 1990 and you still don’t know how much of that 700 is K5.
yes, the charge was changed from that point so we know the muzzle velocity is wrong. We also KNOW the diameter is wrong for this round:
final diameter was 25mm for the penetrator
I did state this wasn’t production, but you’re still using the 700mm+ figure and comparing it to the game which you cannot given its RHAe, meaning a complex target that you don’t know the make-up of.
There is also no RHAe figure for this pre-production round anyways so comparisons cannot be made. There is a manufatuers RHA prediction but with no context.
Well, not like we have production data to work with :)
im not? i havent compared it to in game because i know we cant compare without the test data.
Do you have any figures for the percentage of DU in CHARM3?
the increase vs what gaijin is currently using is 5mm in length and 1mm in diameter, so not to any significant amount, no.
appears to be a 99.6% DU, 0.58% titanium alloy