Quote:
Originally Posted by MarkSheppard
Current spec-cing:
Landcruiser: 110mm gun; 5 to 6mm caliber coaxial, SAM on side of turret. Visually very similar to the AMX-40 or OF-40; at about 43 to 45 metric tons combat weight. Armor protection of around mid production T-55 to early T-62 level -- because its stated canonically that a 88mm L56 can't penetrate it frontally, they're still vulnerable to side shots from PAK guns. Plus, by the 1960s, German tanks are pretty much at parity (or close to it) with the Race; something not possible if it was a blinged up M1A1(HA) equivalent. Autoloaded gun, due to the need to economize on manpower in conquest fleet.
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Artillerycarrier: Analogous to the TAM VCA artillery, but in 100-120mm instead of 155mm. The Race is physically much smaller than humans, so I don't think they can easily manhandle 155mm rounds around.
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So let's see...
https://en.wikipedia.org/wiki/U-5TS
https://ru.wikipedia.org/wiki/%D0%A2-62
115mm gun 2A20 (L/52.6)
Maximum muzzle energy is 6.96 MJ
3BM3 Sabot: 5.5 kg projectile out of a 22 kg shot weight, 1615 m/sec muzzle velocity.
3UOF HE Frag: 14.86 kg projectile out of 28 kg shot weight, 905 m/sec muzzle velocity
From my website:
http://alternatewars.com/BBOW/Ballis...ights_Calc.htm
Scaling down the T-62's gun to 110mm gets us:
Sabot: 4.81 kg projectile and 6.28 MJ muzzle energy at 1,615 m/sec.
HEF: 13 kg projectile and 5.33 MJ muzzle energy at 905 m/sec
Dropping back to my website again:
http://alternatewars.com/BBOW/Ballis...stics_1-07.htm
and plugging in:
110mm Proj Diameter
13 kg projectile mass
905 m/sec initial velocity
45 degree departure angle
0 m fire/target altitude
G8 Drag Model with a form factor of 1.0
0.1 integration interval
Ballistic Trajectory Evaluation
Gets us:
Maximum Range: 15,500 meters, with a time of flight of 67 seconds and a fall angle of 66 degrees
This isn't actually bad. You could get it up to maybe 19-20~ km with rocket assisted shells (wild *** guesstimate, not scientific analysis).
Bonus of using the same gun in your tank and SP howitzer (albeit in different mounts, allowing different elevations):
Resupply problems are dramatically eased for ammunition and spare parts -- important if the Race can only bring the ammo it needs on the ships it departed with.
As for AP penetration, you can just close your eyes and imagine pretty much the same performance as the 115mm:
3BM4 (1963 Steel) 228mm @ 1000m
3BM21 (1970s Tungsten) 360mm @ 1000m
Albeit with tungsten as the main weapon, since the shipping costs of a 4.8 kg sabot projectile across interstellar distances is so high that why not bring the best -- even if it's solid gold?
Depleted Uranium, I don't think the Race would use it -- due to their "long view" tending to avoid messy contaminated battlefields or carcinogens in conquered races.
One thing you'd have to do is have multiple landcruiser slots filled in the OOB representing:
1.) The initial invasion fleet, 100% tungsten sabot rounds, 100% MANPADs
2.) A year or two in, where you're forced to use earth-made steel sabots since you expended a lot of your tungsten rounds in the initial fighting.