The HSTV-L and RDF/LT Guns being renamed to the 75mm ADMAG isn’t necessarily a bad thing or incorrect. From what I can find in other documents not listed in that report, the XM274 was only mounted on the MC-LAV prototype, and a slim chance of it being mounted on a later version of the RDF/LT with a remote controlled Turret.
However, I do agree that there are performance issues with the current implementation of the APFSDS ammo for the gun in game.
The information here is from Documents dated June 1978, and October 1975, which means this data is from well before the XM274 even entered prototyping phase in the 1984/85 time frame. But, well within the 75mm ADMAG testing time frame.
Keep in mind certain values are under the assumption that for example, the penetrator length runs from approximately the back of the nose cone to near the end of the fin assembly as none of these rounds are listed as having tracers. Also keep in mind that the Flight diameter would be different from the penetrator mean diameter for L-O as the flight diameter would also include Buttress thread diameter. Or in some cases nose cone diameter, and does not account for the variable diameter of the actual penetrator.
Note that the DARPA Memo also mentions performance similar to the 105mm rounds in development at the time. The AAI Penetrator shows similar performance to the initial XM735 Prototype from 1973/74. The memo also mentions a 105mm round with a muzzle velocity of 4820ft/s or 1469m/s, given the time period and velocity, this would most likely be XM735E1.
Figure 6/A, The AAI Penetrator, most likely to be the aforementioned projectile with 2lb penetrator going by the listed in flight mass. Which means it should have a Muzzle Velocity of 5450ft/s or 1661m/s according to the DARPA Memo.
AAI Projectile Details
| Property |
Calibers |
inches |
mm |
| Projectile Length |
15.38 |
12.47 |
316.7 |
| Projectile Ø Flight |
1.0 |
.811 |
20.6 |
| ~Penetrator Length~ |
12.78 |
10.364 |
263.26 |
| Fin Assembly Diameter |
2.61 |
2.1167 |
53.76 |
| Fin Assembly Length |
2.46 |
1.995 |
50.67 |
| Nose Cone Length |
2.6 |
2.108 |
53.54 |
| Mass Properties |
lbs. |
kg |
| Mass as Fired |
|
|
| Mass in Flight |
3.04 |
1.38 |
| Mass of Penetrator |
2.0 |
.907 |
| Penetrator L-O |
mm |
| Length Total |
260 |
| Ø Mean |
15.45 |
| Length Frustum |
0 |
| Ø Frustum Tip End |
0 |
| Property |
Penetrator |
Target |
| Material |
DU Staballoy |
Steel |
| Mat Type |
U-0.75%Ti |
RHA |
| Density |
18,600kg/m3 |
7,850kg/m3 |
| RHA BHN |
|
260 |
| Velocity Decay |
ft/s |
m/s |
| 1st km |
292 |
89 |
| Per extra km |
289 |
88 |
| Velocity @ Rng |
ft/s |
m/s |
| Muzzle |
5450 |
1661 |
| 100m |
5420 |
1652 |
| 500m |
5302 |
1616 |
| 1000m |
5158 |
1572 |
| 1500m |
5013 |
1528 |
| 2000m |
4869 |
1484 |
| Pen @ Rng (mm) |
Vert |
30° |
60° |
| Muzzle |
265 |
237 |
155 |
| 100m |
264 |
236 |
154 |
| 500m |
260 |
233 |
152 |
| 1000m |
255 |
228 |
149 |
| 1500m |
249 |
223 |
145 |
| 2000m |
243 |
217 |
142 |
Figures 3 and 4 for AAAC-II are listed in ADA058596 as that of a previous design, again given the time period, that would likely make it the first iteration of the 3lb penetrator design mentioned in the DARPA memo with a muzzle velocity of 5250ft/s or 1600m/s. The in flight mass listed in both ADA diagrams seems to back this up. The projectile flight diameter listed for these variants is also explained as being that of the Nose Cone/Windshield, which is larger than the main body diameter.
AAAC-II Projectile Datails
| Property |
Calibers |
inches |
mm |
| Projectile Length |
18.34 |
16.689 |
423.9 |
| Projectile Ø Flight |
1.0 |
0.91 |
23.114 |
| ~Penetrator Length~ |
15.61 |
14.205 |
360.81 |
| Fin Assembly Diameter |
2.418 |
2.2 |
55.88 |
| Fin Assembly Length |
4.12 |
3.749 |
95.229 |
| Nose Cone Length |
2.73 |
2.484 |
63.101 |
| Mass Properties |
lbs. |
kg |
| Mass as Fired |
|
|
| Mass in Flight |
4.19 |
1.9 |
| Mass of Penetrator |
3.00 |
1.36 |
| Penetrator L-O |
mm |
| Length Total |
360 |
| Ø Mean |
16.08 |
| Length Frustum |
0 |
| Ø Frustum Tip End |
0 |
| Property |
Penetrator |
Target |
| Material |
DU Staballoy |
Steel |
| Mat Type |
U-0.75%Ti |
RHA |
| Density |
18,600kg/m3 |
7,850kg/m3 |
| RHA BHN |
|
260 |
| Velocity Decay |
ft/s |
m/s |
| 1st km |
280 |
85 |
| Per extra km |
276 |
84 |
| Velocity @ Rng |
ft/s |
m/s |
| Muzzle |
5250 |
1600 |
| 100m |
5222 |
1592 |
| 500m |
5110 |
1557 |
| 1000m |
4970 |
1515 |
| 1500m |
4832 |
1473 |
| 2000m |
4694 |
1431 |
| Pen @ Rng (mm) |
Vert |
30° |
60° |
| Muzzle |
335 |
300 |
196 |
| 100m |
334 |
299 |
195 |
| 500m |
328 |
294 |
192 |
| 1000m |
321 |
287 |
187 |
| 1500m |
313 |
280 |
183 |
| 2000m |
305 |
273 |
178 |
More to be added later…
4 Likes
I stick with my previous statement had the HSTV-L or RDF-LT turned into a production tank it would have received the XM274. But during teating IDK I don’t have one sitting next to me so it’s all speculation from me.
gotta love how two got denied for nonsensical reasons
“It’s not a bug. All similar vehicles have similar DM. In case of the Pantsir it’s an actual armor that protects ammo.” literally saying we dont care, this russian thing has it so HSTVL has to
and another denied based on an iffy bug report saying that the gun designation was wrong even though it seems to be that the gun was redesignated to XM247 with no changes, so its just an excuse to not buff it
and im guessing AAAC-III which is delta 3 has the pen of m774
i hope they atleast add delta 2 tbh
Hey Conraire, any updates to this? Now would be a good time to get it implemented with the new update coming out
New changes with the new update, XM885 got buffed in pen up to 500 meters, but it was nerfed past that
1 Like
Nothing that I can see officially, other than the minor thing from Dev server posted above. Even that is subject to change.
1 Like
M735, when is it going to be fixed?
1 Like
So the Yak 141 gets stuff it never had, but he HSTLV which has more proof that it fired a better round, can’t get its round???
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HSTV-L is a balancing rather than historical decision, Yak-141 is a prototype so has to be treated differently to all other existing vehicle. It is like Ho229, which might have barely flown, but we want to have it in game.
Said round would make it BR 12.0 - 12.3 depending on performance.
HSTVL is also a completed prototype, and not comparable to Kikka and Yak-141.
HSTVL is comparable to Object 435.
you missed the point the yak 141 is a prototype that has stuff it never had, it isn’t a real vehicle, the HSTVL is a complete prototype that has enough information proving what its fired, but it doesn’t get it.
Its like the KH38MT is still in the game, even though there is 0 proof hat its even a weapon used.
Exactly, 2S38 needs to be moved to 11.7 then the prem noobs can feel what we are feeling when our round pens but does no damage
1 Like
Kikka and Yak-141 are not completed prototypes, they are not comparable to HSTVL and Abrams.
@Dragon_Storm_246 wants to move Begleit to 10.7 and HSTVL to 12.7 or they’re shilling for Russian equipment…
HSTVL has no armor, and it has been proven that its round is underperforming so I dont know what ur on about
Never said anything about the Abrams? the Object 435 is aa MBT, are you just ignoring what im typing or are you stupid?
HSTVL’s round causes armor spalling 2x as much, and pens 22% more than 2S38’s round.
HSTVL has double the mobility over Begleitpanzer and 2S38 which share mobility.
HSTVL’s the fastest tracked vehicle in the game.
The Russians could never come up with something anywhere as close to HSTVL; partly because of how much HSTVL costs.
worse fire rate, significantly less rounds, 2S38 Gen 3 thermals so on and so on, Its a vehicle from 2023 and Gaijin thinks its OK to have it at 10.3 while people grinding the US tree have to suffer with a 76mm round that has a worse fire rate which has been proven to be 1 second and not 1.5, as well as a round with worse pen than M735 while being significantly more modern. Do you really think the designers of the HSTVL would make a round that has worse pen than a prototype round from the early 70s (M735)??
And its been proven over and over and over again that XM885 is under performing
And Gaijin’s response is to add a RDFLT ( HSTVL Derivative) that compleately fixes that lack of ammo issue with the small cost of reduced mobility for a Wopping 70 USD. Except that XM885 is still dog water and Im guessing they are finally going to buff it to try to sell more RDFLTs because the round will be more useable to get kills
