[Blog] Double check my work Attack Vector Tactical Coilguns

sage
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Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Mar 11, 2023 2:54:19 GMT

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Post by sage on Mar 11, 2023 2:54:19 GMT

Ok if you have been following my blogs on my work into Attack Vector Tactical in Children of a Dead Earth. You know that I have been struggling with reproducing the coilguns form Attack Vector Tactical in Children of a Dead Earth.

The reason why I have been having problems is that the shell in AT:V act more like tube-fired missiles out of a Conventional Cannon with the AI script turned to ignore range turned on. You can see the problem right away, as there is no guarantee that the right AI would be used. This forced me to skip producing conventional cannons with tube fired missiles.

So, at first I tried using carrier modules with kinetic-kill missiles. The problem is with muzzle velocity. You see, the coilguns in AT:V can aim at their targets in any direction, and in CoaDE the carrier modules can only fire in one direction. The missiles I was using for these carrier modules where ion missiles, that have very low maneuverability. They were based on a small gun drone that I had worked on before. Unless the carrier module is forward mount, the drone would not receive any benefits from the carrier module's muzzle velocity.

Then I tried making Sand casters that had a large range. What I came up with was ranges from 130 Km to 245 Km, but rate of fire of 2 rounds per second to 1 per second. The energy was high thought per round from 231 kj to 882 kj to 894 kj. Mostly because the muzzle velocity is high, with a range of 21.5 km/s to 40.5 km/s. The problem with this design is that in AT:V coilgun rounds are there to force you to fire your defensive lasers and or missile, or to use you delta-V to dodge the shots. The 1g rounds do not force you ship to perform evasive maneuvers or activate your defense of lasers.

The last thing I tried was to make a coil gun that fired flak rounds. I came up with a 25 X 40g flak shell and then got the coilgun to fire it up to a range of 54.5 km at 1 MW of power. It rate of fire is 1m and 8 sec, but is four barreled. While this range is 3 times that of a conventional Cannon, at 20.6 Km, it is very short when most laser can have ranges in the hundreds of Km.

After this I went back to work some more on those ion missiles, thinking that all I had to do was make better missile. But I feel that I am running in circles this time and what to have my work so far double checked by voting.

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Mar 24, 2023 17:13:49 GMT

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Post by sage on Mar 24, 2023 17:13:49 GMT

I just noted that there is a fifth option. What I could do is design 4 missiles that fit the role of each of the coil guns and just have them side launch, even for the coilguns that are aiming forward. That always a option.

I think I will look into it.

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Apr 3, 2023 20:52:38 GMT

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Post by sage on Apr 3, 2023 20:52:38 GMT

Ok I only needed 3 missiles.

one that was 50 kg and 8g of acceleration
one that was 100 kg and 8g of acceleration
one that was 200 kg and 8g of acceleration

And so far for the S(F) Mark 1 Baiburs class fighter it has worked out.

The problem is that I'm not sure if I should use Kinetic kill missiles or tactical nuclear ones.

Now in AV:T they are Kinetic kill vehicles. But tactical nuclear weapons would work better with SandCasters and Anti-ship laser. As they can weaken the armor before the Anti-ship laser, and then the SandCaster take over.

Here are the options for nuclear warheads.

250 t Pure Fission Nuke
Mass: 23.3 kg
cost: 1.78 kc
Based on the W54 Mod 2
Weighted 23.1 kg
Yield: 20 t

2.45 kt Boosted Fission Nuke
Mass: 32.0 kg
cost: 2.56 kc
Based on the B54 Mod2 bomb or called the Special Atomic Demolition Munition
Weighted: 32kg
Yield: 1kt

It should be noted that the W25 nuclear pure fission warhead was about 100kg and had a 1.7kt yield.

Here is the difference between the 50kg kinetic Kill missile, 50kg 250t nuke Missile, 50kg 2.45kt nuke missile.

Weapons type	Kinetic Kill	250t nuke	2.45kt nuke
Acceleration	8 g	8 g	8g
Mass	50 kg	50 kg	50 kg
Cost:	232 c	1920 c	2690 c
Real World Maintenace cost per year	$2,084,314.16 to $2,842,246.59	$17,249,496.53 to $23,522,040.72	$24,167,263.37 to $32,955,359.14
Delta - V	4.15 km/s	1.45 km/s	0.646 km/s
Burn time	30.4 s	15.2 s	7.59 s
Armor	7.00 mm Polyethylene	3.30 mm Polyethylene	4.80 mm Polyethylene

To compare against stock missiles with 2.45kt pure Fission warheads

Weapons type	Nuclear Gyrojet	Sniper Nuclear	Staged Striker Nuclear	Striker Nuclear
Warhead	2.45kt Pure Fission	2.45kt Pure Fission	2.45kt Pure Fission	2.45kt Pure Fission
Acceleration	1.53 g	986 mg	2.00 g	5.91 g
Mass	102 kg	1.11 metric tons	921 kg	311 kg
Cost:	8080 c	10900 c	11200 c	9700 c
Delta - V	0.165 km/s	3.71 km/s	2.76 km/s	1.06 km/s
Burn time	10.5 s	2m 29s	1m 7s	13.4 s
Armor	none	500 um of Silica Aerogel	5.00 mm of Graphite	5.00 mm of Graphite

Here is the 50 kg, 100kg, and 200 kg 2.45kt nuclear missiles.

Weapons type	50 kg nuke	100 kg nuke	200 kg nuke
Warhead	2.45kt nuke	2.45kt nuke	2.45kt nuke
Acceleration	8 g	8 g	8 g
Mass	50 kg	100 kg	200 kg
Cost:	2690 c	2910 c	3450 c
Delta - V	0.645 km/s	1.93 km/s	2.51 km/s
Burn time	7.59 s	18.9s	22.6 s
Armor	4.80 mm Polyethylene	4.80 mm Polyethylene 4.00 mm Polyethylene	4.80 mm Polyethylene 4.00 mm Polyethylene 2.90 mm Polyethylene

Note the 100kg nuke has a second coating of Polyethylene to produce 1 level of inherent Hardening
Note the 100kg nuke has a second and third coating of Polyethylene to produce 2 level of inherent Hardening

Here is 50 kg, 100kg, and 200 kg Kinetic Kill missiles.

Weapons type	50 kg Kinetic Kill	100 kg Kinetic Kil	200 kg Kinetic Kill
Acceleration	8 g	8 g	8 g
Mass	50 kg	100 kg	200 kg
Cost:	232 c	564 c	1110 c
Delta - V	4.15 km/s	3.22 km/s	3.21 km/s
Burn time	30.4 s	26.5 s	26.3 s
Armor	7.00 mm Polyethylene	7.00 mm Polyethylene 1.00 cm Polyethylene	7.00 mm Polyethylene 1.00 cm Polyethylene 7.00 mm Polyethylene

Last Edit: Apr 15, 2023 22:39:00 GMT by sage

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Apr 8, 2023 3:06:06 GMT

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Post by sage on Apr 8, 2023 3:06:06 GMT

Does anyone here have a take on Orbital bombardment, or space based nuclear deterrence?

Here let me ask the question again, with more detail. Which is better?

128 Kinetic kill vehicles and 4 7.0Mt nukes

or

128 2.45 kt nukes and 4 7.0Mt nukes

for Orbital bombardment and nuclear deterrence?

Last Edit: Apr 8, 2023 3:17:47 GMT by sage

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Apr 10, 2023 2:17:11 GMT

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Post by sage on Apr 10, 2023 2:17:11 GMT

Apr 8, 2023 3:06:06 GMT sage said:

Does anyone here have a take on Orbital bombardment, or space based nuclear deterrence?

Here let me ask the question again, with more detail. Which is better?

128 Kinetic kill vehicles and 4 7.0Mt nukes

or

128 2.45 kt nukes and 4 7.0Mt nukes

for Orbital bombardment and nuclear deterrence?

The reason why this is important, is that I'm trying to build a correct version of both the big missile and tri-missile from AT:V.

Right now I use the missile code.

Big missile
B-4[Nk3][ARM4], which means
Nuke warheard: 7.0 Mt
    acceleration 8
    burn time 64 seconds
armor equal to
        7.00 mm polyethylene, 0% start
      2.00 cm polyethylene, 40% start
       1.40 cm polyethylene, 75% start

Tri-missile
T-3[Nk2][ARM2], which means
    Nuke warheard: 3.5 Mt
    acceleration 8
    burn time 48 seconds
    armor equal to
        7.00 mm polyethylene, 0% start
      1.00 cm polyethylene, 40% start
      7.00 cm polyethylene, 75% start

But am not sure if the armor is right, as it is based on the Kinetic Kill Missile and not the 2.45kt ones.

Last Edit: Apr 10, 2023 2:17:37 GMT by sage

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Apr 16, 2023 2:37:02 GMT

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Post by sage on Apr 16, 2023 2:37:02 GMT

While work on the update to the big missile and tri-missile, I was finishing up with the Kinetic Kill Missile I use in place of the coilguns in AT:V.

That when I noted a new problem. There is not much difference between a 2CG[4] and a 3CG[4] in my stand-ins. In fact, the only thing that changes is the amount of power each uses. The 2CG[4] uses 1MW and the 3CG[4] uses 2MW. This only changes the waste heat, and muzzle velocity of the launcher. And sense these weapons are side mounted, the muzzle velocity has no effect on the performance of the weapon.

Meaning that I have to create some difference in how the weapon performances.

Right now I'm working on producing two 50kg missiles, one that has 8 g of acceleration, and another that has 16g of acceleration.

Then I plan to use the 8g 50 kg for the 2CG[4] and uses the 16g 50 kg for the 3CG[4]. This would mean that I would have to change the 100kg 8g to 16g to stay consistent with the 3CG[2] mount, and would also have to change the 200kg 8g to 24 g to stay consistent with the 4CG[1] mount.

I also may have to change the armor and armor code for the big missile and tri-missile, given how easy it is to destroy even 2 level hardened 200kg rounds in AT:V

sage
Senior Member

Posts: 295

[Blog] Double check my work Attack Vector Tactical Coilguns Apr 16, 2023 4:16:16 GMT

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Post by sage on Apr 16, 2023 4:16:16 GMT

I didn't think I could redesign so fast. But here are the new Kinetic Kill missile rounds after the redesign.

Weapons type	2CG[4]	3CG[4]	3CG[2]	4CG[1]
Acceleration	8 g	16 g	16 g	24 g
Mass	50 kg	50 kg	101 kg	200 kg
Cost:	230 c	220 c	596 c	1120 c
Delta - V:	4.15 km/s	4.15 km/s	3.20 km/s	3.20 km/s
Burn time	30.4 s	15.2 s	13.2 s	8.77s
Armor	3.56 mm Polyethylene	3.56 mm Polyethylene	3.56 mm Polyethylene 6.00 mm Polyethylene	3.56 mm Polyethylene 6.00 mm Polyethylene 500 um Polyethylene

I know that the 3CG[2] should be 100 kg, and not 101kg. But the delta-v came out to a even 3.20 km/s, the same as the 4CG[1] 200kg rounds.

Last Edit: Apr 16, 2023 4:36:23 GMT by sage