HAND - repost (to be edited)

OK, now we're talking about a really big gun. Of course, for a realism-purist like me it might be unexpectable to develop such a thing, rather than rely on missiles, but I enjoy the challenge of making normally impossible things into possible. And, after all, people want superguns - so let them be like this one, requiring only money and slight technological stretch, rather than physically impossible stuff. You know, hypervelocity railguns, nuclear guns delivering 1000t-equivalent energy with 100t-equivalent charge, capacitorless coilguns, just powder shooting faster than it can expand, and whatever else which won't work. Of course, sometimes it's not as good as impossible things - but it turns out to be sufficient for any purpose - and more thorough design more than compensates for lack of wanked up advantages.

Also, a sidenote on crew. It's not US Army, not UK, not Russian, nor any other, it's just how things are done in this facility of Vault-Tec Security Division. Specialty officers are ranked higher than in US, ones who order enlisted lower (as the enlisted aren't even citizens). Of course, it doesn't imply it has be done this way, especially since it's largely for contract installations. Still, using other complement type is likely to increase the requirements - that's why the facility always has reserves.

So:



The Heavy Artillery Naval Defense system, HAND, was developed by Vault-Tec and Brotherhood of Steel by contract with Clandonia Prime, dedicated to creating a reliable underground artillery based defense. Extended research into the project led to two successive designs, conventional and ram-based cannons, designed to provide defense around a large area, to a specified side.

While the first design proved successful, it opened the eyes of Vault-Tec to new market opportunities. Rather than disbanding the research teams, they were extended, and continued research into new ways of doing the task. The main issue was low life of the barrel, which negated the advantage of cheap rounds, and the Brotherhood of Steel, renowned for their design or reliable, long-life R1 rifle, was invited to collaborate to find a way of increasing barrel life.

As a result of multi-billion project, the new cannon was developed, very different from the original. HAND applied a different principle to the propulsion, which allowed to reduce barrel contact and mitigate pressure drop. While this requires a prohibitive amount of work for each shot to be used in a mobile application, prohibitive complexity and prohibitive size, these disadvantages were already present in the original gun, and therefore considered acceptable.
The new projectiles turned out far more expensive. However, as the original issue wasn't with their cost, it was discussed and the customers confirmed that they are better satisfied with a more effective, even if more expensive in use. Defensive role of the installation is important in this.



The HAND cannon is fixed underground, with no parts even visible outside the ground, and all exits and ventilation shafts concealed by grass, forests, mountain features, or other natural objects. The barrel, supported by the tunnel dug in the ground, can't be moved, and relies entirely on guidance to achieve accuracy.

Rather than use a conventional rifled gun, the barrel became smoothbore, reducing cost and wear, and lined in three-tier separate sections. The outer barrel sections are constructed of high-strength corrosion-resistant alloyed steel tubes, protecting the barrel from chemical effects, and tensioning the middle sections, being sleeved on them heated. Support railers and external equipment are also welded to these sections, protecting the middle layer from weak points. The middle sections, built out of electro-slug refined steel, form the major pressure vessel, keeping the barrel intact, both for pressure tension and weight bending. The innermost sections are constructed of low-brittleness heat-resistant ceramic coil sections, embedded in a non-ferrous alloy matrix. These ceramic sections contain sets of longitudinally operating coils and transversely operating electromagnets, with ceramics-insulated tungsten reinforced copper wiring passing beneath. Such complex structure starts only past the first 40 meters of the barrel, which rather have tungsten alloy inner sections with clean, polished finish. The entire barrel is encased in reinforced concrete tubing to spread the weight.

The barrel continues down with widened thick plates on the top and the bottom. Between them, there is a prolonged 32-meter chamber, a solid block forged in the unique Boneyard Metalworks facility, with the same diameter as the barrel for the most part and an extension in the base. There are three chambers, which can be slided sideways, to increase available loading time, and allow for the chambers to cool. Two loading compartments, closed off by armored doors, are located on the sides of the gun.
As the projectile is inserted, the sabot is hooked by aramide cables to the front of the chamber, to hold it in place.

The gun can operate in two major modes. The first mode is liquid-fuel propulsion. Liquid fuel is injected into the chamber first stage, ignited electrically and electrothermally assisted, and the projectile, surrounded by polymer sabot to protect the barrel, is propelled by the force of expanding gases. The injection can be continuous, to provide greater pressure at later stages. This mode provides limited velocity, but can be used even when on operating on battery power only, and it takes only 15 minutes to fire the gun, with full personnel and full power.

In the second mode, longer time, more supplies, and 30,000 or more MJ of power are required. Before loading, extremely strong high-temperature cables are welded to the main projectile to hold a piston behind it, and the whole assembly is inserted into the chamber, with aramide cables hooked to its base. Cables holding the projectile from falling are equipped with delayed fuses. As the chamber slides and locks in place, propellant-oxidizer mixture is injected between the piston and the projectile, filling the space. The fuses cut the cables, and propellant is injected into the subchamber behind the piston, lifting the projectile into the barrel.
After all personnel is evacuated behind the blast doors, the mixture between the pistol and the projectile is evaporated, slowly enough to avoid ignition, with the pressure inside supported by the cables. When the process is complete, evaporation of some piston propellant starts, and, as the projectile starts to accelerate by pressure and moves about ten meters, plasma jet fires behind the piston, expanding and igniting the propellant. The resulting pressure rise in the main compartment detonates the evaporated propellant, pushing the main projectile forward and the piston back into the chamber, slowing the initial recoil enough to hold. Propellant injection and burning in the back chamber continues, however, so the piston shoots back forward, maintaining high pressure between the piston and the projectile.
As the round fires, the electromagnets activate, preventing pressure on the barrel from the projectile, and providing extra acceleration in the last half of the barrel.
A slightly improved method, codenamed TR., is now under development, and the guns will support it when it's done, with new projectiles.

Once the projectile is fired, its fins and, optionally, engines provide steering to the required location. Control may be provided by satellites, radar, optics, pre-programming, and other methods.


* Caliber:
** 1250mm projectile
** 1600mm smoothbore with sabot
* Barrel length: 500m
* Barrel mass: 40,000 tonnes
* Elevation: Fixed, depends on design, 60-89 degrees
* Rate of fire:
** Quick mode - 1 round every 15 minutes, typically 50 rounds a day
** High-velocity - 1 round each hour, typically 20 rounds a day
* Accuracy: Depending on guidance

* Facility depth: 600-700m, depending on barrel elevation
* Additional systems:
** Subway transport to magazine bunkers
** Fast supercapacitors, 96GJ capacity
** Thyristor and MOSFET switching control, 1024GW max power
** Autonomous power, 300MWt/80MWe nuclear or 80MWe two-stage gas/steam turbine-generator
** Satellite and radio communications
** Guidance control
** Defensive surface-air and surface-surface missiles

* Armor protection of the gun includes, as maximum thickness, up to:
** 20m of ground
** 5m of armor steel
** 5m of structural steel
** 20m of explosive active/reactive armor
** 40m of armor steel, ultra-high-performance concrete and ceramics composite
** 5m of structural steel
** 5m of steel-concrete composite
** Hydraulically sliding main lid with backup explosives-based opening/closing, backup lid in the slot
** Extra armor in the immediate vicinity of the gun
** Secondary lid in the lower armor layer
** 10-meter steel-concrete protection layer within 100m vicinity
* Shell storage: 200 per magazine



The personnel is separated in three parts: gun crew, responsible for directing the fire, facility crew, responsible for facility maintenance, and additional service crew, providing defense to the facility and auxiliary roles. Crew works in 4 shifts in 24 hours, with 5 shift groups for 5 of 6 days operation.
Fire control, target processing and guidance are highly automated by the central computer system, but the personnel is stationed to improve operation and provide manual control if required.

Single-gun systems contain two command centers, main and backup. Command centers are located at 600m or more, suspended on shock absorbers, proven to withstand impacts up to 50 megatons on the surface.

Each computer unit measures 8.8 meters in width, 3.2m in height, reaching the ceiling, and 3.2m in depth. Information output is provided by 30 (10x3) 0.8x0.6m three-dimensional OLED monitors with 5120x3200x2 resolution, and input by three work places, for the officer and two assistants.
Each unit is powered by sixteen 4 TFLOPS RISC processing blocks, located in two racks on its back, with each housing 32GB of 1024-bit 2-GHz operation RAM, 256GB of 256-bit 1-GHz ECC data RAM, 1024GB of solid state and 32TB of magnetic drive memory. This allows every single unit to do all the processing work and store all the data for the entire facility, so the units duplicate their efforts, ensuring lack of errors.

All screens are protected by 50mm aluminium oxynitride anti-vandal shielding, withstanding multiple .50BMG or grenade impacts, and the units themselves carry 50mm metal matrix composite and reactive armor protection on their alloyed steel chassis, shielding them against RPG grenades and up to 40mm projectiles. All components are suspended on shock absorbers, and heavy casings absorb and dampen the external vibration. Units are airtight, filled with heavy inert gas, and cooling is provided by heatpipes connected to the central cooling system. The working environment stays completely silent, due to the dampeners.

Backup on-line UPS is included in each unit, with a battery rack and microturbine (connected to secondary ventilation), allowing for up to week powerless operation if ventilation is intact, or 72 hours on batteries without power. Compressed high-oxygen mixture is contained in every unit, and can provide 48 hours of breathing for the entire center.
There are 12 units in each command center, eight located in a circular pattern and four reserve nearby in a semi-circle. Since each unit costs 2 millions, one might opt to save 60 million by ordering cheaper last-generation units at only 8% the cost of new ones, but it decreases facility operating efficiency, and requires distributed processing rather than redundant. New units are connected by full interface, so their reserves can be combined, providing over two weeks of seamless work even if the center is left fully autonomous.


* Gun crew (400)

64 officers of the gun crew include:
- Commander, lieutenant colonel, holds command over the entire facility
- Commander assistant, major, replaces the commander when he's not on duty
- First officer, major
- First officer assistant, captain

And, in each shift:
- Shift commander, major - makes decisions, controls the facility if none of designated commanders are present
- Coordination officer, lieutenant - responsible for interaction with other facilities
- Fire control officer, lieutenant - responsible for operating the gun
- Direction officer, lieutenant - responsible for selecting targets
- Targeting officer, lieutenant - responsible for target processing
- Guidance officer, lieutenant - responsible for guidance of shells
- Technical officer, lieutenant - monitors facility state
- Defense officer, lieutenant - coordinates defensive armament use with facility personnel
Outside the command center:
- 2 Loading officers, lieutenant - oversee gun loading operation
- 2 Officers, lieutenant - responsible for commanding the enlisted personnel

128 NCO complement includes:
- Chief sergeant
- Commander's second assistant
- Executive officer second assistant
For each shift:
- Shift commander assistant
- 14 assistants, warrant officer - two assist each specialist officer in the command center, except for personnel commanders
- 8 sergeants - responsible for commanding the enlisted personnel and performing required duties
- 2 loading officer assistants

There are also 208 enlisted:
8 reserve
40 per shift:
12 in two loading crews
20 in monitoring crew
8 ordered by the officer and NCO staff as required


* Facility crew, 200 total (minimum):

32 officers:
- Chief facility officer, captain
- Assistant facility officer, lieutenant
For each shift:
- Communications officer, lieutenant - manages external communications
- Maintenance officer, lieutenant - reports on facility maintenance
- Security officer, lieutenant - commands internal security
- Medical officer, lieutenant (others are called in wherever needed)
- 2 Personnel officers, lieutenant
32 NCO:
- Chief facility officer assistant
- 6 medical staff
For each shift:
- Communications officer assistant
- 10 sergeants - responsible for performing duties, reassigned between teams as needed
136 enlisted:
6 reserve
26 per shift:
- 16 maintenance personnel
- 10 ordered by the officer and NCO staff

* Additional crew (400 standard)
20 officers
60 NCO
320 enlisted

Total facility skeleton crew is 600, with 96 officers and at least 160 NCO.
Full crew is 1000, with 116 officers and at least 220 NCO, and can be extended up to 2000.





Shells:

*Update: Moved first two shells to non-toxic and non-contaminating explosives. The last remains low toxicity.*


Note: Basic projectiles are no longer issued, replaced by the standard model.


- HE-1 - Basic -

High explosive, passive guidance and steering
The shell contains binary explosive, which should be mixed prior to firing. Contents are a granulated porous solid, and have to be filled with liquid, stored separately. Filling is done via a valve in the side. Even after mixing, the explosive can only be detonated with other powerful high explosive, not just shock or usual detonator. The HE detonator is inserted through a door in the nose cone, from the side.
After preparation, the shell contents form a solid mix within 30 minutes, and don't degrade for at least 5 years. Unprepared shell at end of its lifetime can be fully recycled, since components are still separate.

* Length of shell: 8 m
* Weight of projectile: 32,000 kg
* Explosive:
** 8,000 kg BA-1.2
** BA1.2: Binary, ammonium nitrate based, grade 1, variant 2
** Composition: 82% ammonium nitrate, 12% HPF2, 5% nitrocellulose, 1% paraffin
** Detonator: PBX-9502, 20kg
** Non-toxic, produces low toxicity fumes, negligible environmental impact, recyclable
** 12,000 kg TNT equivalent
* Muzzle velocity: 3000 m/s, quick mode *(1)
* Maximum range: 550 km at 75 degree elevation
* CEP: 40 m
* RHA penetration: 3000+ mm
* Barrel life spent per firing: 0.1%

* Cost: $150,000
* Shelf life: at least 95 years in storage, at least 5 years prepared
** Electronics replaced each 20 years
* Distribution: Unrestricted, open-source schematics


- HE-2 - Extended HE -

High explosive, passive guidance, active+passive steering
The binary explosive and usage are almost equal to HE-1. Advanced ABM protection is provided by less sensitive explosive. Incendiary effect.

* Length of shell: 8 m
* Weight of projectile: 40,000 kg
* Explosive:
** 10,000 kg BA-2.1
** BA1.2: Binary, ammonium nitrate based, grade 2, variant 1
** Composition: 80% ammonium nitrate, 12% HPF2, 1% nitrocellulose, 2% epoxy, 5% aluminium
** Detonator: PBX-9502, 25kg
** Non-toxic, produces low toxicity fumes, negligible environmental impact, recyclable
** 15,000 kg TNT equivalent
** 3,000 kg TH3 equivalent

- Basic mode -

* Muzzle velocity: 2500 m/s *(1)
* Maximum range: 300 km at 75 degree elevation
* CEP: 40 m
* RHA penetration: 3000 mm
* Barrel life spent per firing: 0.1%

- Full mode -

* Muzzle velocity: 3950 m/s
* Maximum range: 950 km at 75 degree elevation
* Effective range: 800 km at 75 degree elevation
* CEP: 25m
* RHA penetration: 4000+ mm
* Barrel life spent per firing: 0.15%

* Cost: $300,000
* Shelf life: at least 95 years in storage, at least 5 years prepared
** Electronics upgraded each 10 years
* Distribution: Unrestricted



- AShP-1 - Anti-shipping projectile -

Anti-shipping, long-range
Armor piercing+High explosive, passive+active steering, radar, laser and programmed guidance

The shell contains binary explosive, which should be mixed prior to firing. Shell contents are a porous solid with 20 deep vertical channels inside. Filling is done with positioning the shell vertically and temporary removing the nose cone. The channels are filled with HPF5 liquid, stored separately, and, after 15 minutes, as the liquid is absorbed, loaded with detonation assistance rods, filled with aluminium powder and filled with I4 liquid. The main detonator is then installed in the nose cone. The shell can already be loaded and requires no further procedures except for 5 minutes time to let mixing take place.
Even after mixing, the explosive can only be detonated with other high explosive, not by just shock or a usual detonator. Totally, the preparation takes 30 minutes. The shell is most efficient between 60 and 300 minutes after preparation, as otherwise the chemical processes form products contaminating the explosive. AShP-1 stays effective, despite slightly degraded performance, for at least 72 hours, after which performance is not guaranteed.


* Length of shell: 10 m
* Weight of projectile: 50,000 kg

* Shell:
** Alloyed steel
** Improved ballistic coefficient
** HTC nose
** HEAT assist

* Explosive:
**9,000 kg, BSA2.6
** BSA2.6: Binary, stabilized mixture, ammonium nitrate based, class 2, variant 6
** Composition: 60% ammonium nitrate, 10% HPF4, 20% aluminium, 2% I4, 4% nitrocellulose, 2% resin, 1% stabilizer mix, 1% PBX-9502
** Detonators: PBX-9502, 80kg
** Low toxicity materials, low toxicity fumes, negligible environmental effect, partially recyclable
** TNT equivalent: 12,000 kg
** TH3 equivalent: 6,000 kg
** Impact insensitivity: over 450
** Friction insensitivity: 300
** Thermal insensitivity: 200
** ESD insensitivity: 800

- Quick mode -

* Muzzle velocity: 2500 m/s (2000 m/s recommended for sensor safety)
* Maximum range: 550 km at 75 degree elevation (effectively 60 due to steering)
* Effective range: 500 km at 75 degree elevation
* CEP: 10m, 15m with countermeasures
* RHA penetration: 2500 mm
* Barrel life spent per firing: 0.1%

- Full mode -

* Muzzle velocity: 3950 m/s
* Maximum range: 950 km at 75 degree elevation
* Effective range: 850 km at 75 degree elevation
* CEP: 8m, 10m with countermeasures
* RHA penetration: 8000mm normal, 6000mm practical
* Barrel life spent per firing: 0.2%

* Cost: $2,000,000
* Shelf life: at least 95 years in storage, 3 days prepared
** Electronics replaced each 10 years
* Distribution: Unrestricted



- LRS-4, Advanced Long Range Anti-Shipping Projectile -

LRS-4 was developed by Aerospace Logistics, basing on ALC VSM-3X missile, inheriting major guidance package, explosive, shell construction, and part of the guidance system. LRS-4 shares the precision capabilities of VSM-3X, combining them with the durability of a gun shell.

The projectile contains highly insensitized, high-strength explosive content, confined in the internal structure. Tetrahedral structure was used initially in VSM-3X, but was changed to vertically stacked honeycomb structures due to mass manufacturing cost concerns. The new structure consists of vertically stacked aluminium honeycombs, with continuous vertical walls, 100mm cell diameter (50mm wall), 50mm cell height. Insides the cells, within depleted uranium liner and polyether block amide layer, the SLX 5.3 load-bearing explosive mixture is confined. During explosion, the shell produces both explosive and strong incendiary effects. Low sensitivity prevents SLX5.3 from detonating without use of high explosive primers, and the risk of accidental detonation during CIWS shots impact is confined to primer hit.

Complex sensors and guidance of VSM-3X were inherited by LRS-4, and, while restricting fast mode operation, work as efficiently in lower-shock full mode. The sensors include passive radar and radio frequency detection, active phased array radar, passive wideband low-IR to UV optical scanners, multi-frequency laser acquisition, identification and ranging systems, and extensive programmed control system.
The analysis system is powered by twenty independent processing modules, two in the nose, four in the dedicated processing compartment, twelve spread around cells, and two in the rear compartment. Each module, fitting in one cell, contains two redundant 100 MHz RISC processors, delivering 4 GFLOPS each at 40W consumption, 16 operation memory chips (16 MB, 16 bit each) at 100 MHz, and 8 data memory chips, 128 megabyte and 16 bit each, at 50 MHz. Four flash-based solid state drives, 16GB each, are installed in RAID10 configuration with data memory cache, with POSIX file system, storing over 60 GB of formation and ship data. To power the module, four redundant silver-zinc batteries are included inside.
Modules are connected by a 100-megabit interface, operating either in dual-redundancy memory sharing auto-scaling multiprocessing, seamlessly redistributing load in case of processor damage. One sets of 2 main plus 1 reserve processors works under CP/M-2005 real-time operating system, one set of 2+1 under QNX Neutrino 8.1, one 2+1 set under RTEMS (Real-Time Executive for Missile Systems) 5.5, constantly comparing their produced results, with additional 3 redundant modules coordinating the systems. In case of processing unit damage, unit power is maintained by merging the sets.

In active acquisition, the projectile is capable of detecting and analyzing formations, recognizing ships, selecting the most appropriate target, and combining methods to single out the true target. Once the ship is recognized, LRS-4 uses radio frequency, optical (passive and laser) systems, other missiles and satellite data, to identify and match with three-dimensional model all major elements of the ship, and either proceed to engage a preset element or select an element based on the installed dynamic analysis, prediction and control system.

Like VSM-3X, to avoid interception, the shell features both passive and electronic measures. Passive protection from interception is provided by radar-absorbent materials, within a structure tuned for standard frequencies suppression. The shell routine includes stochastic element in flight profile, dynamic control of active signature, detection chance prediction, recognition of detection reaction and preset profile switch. The profile merging feature was removed from the routine, however, to avoid irrecoverable maneuvering, and instead the SSA and SSDA profiles were installed.

To further reduce detection change, LRS-4 retains the jammer and countermeasures set. In case of detection and attack, 18 decoys are also installed, emulating the thermal and radar signature. If informed prior to launch of any other cooperation-compatible missiles or projectiles, LRS-4 communicates with them, via either distributed computer analysis or direct command deciding on the role of scanner, jammer, pack leader, or stealth attacker. In most cases, due to more extensive protection, the electronics are biased to assume the role of scanner or jammer, diverting fire from missiles, unless a simple projectile can be framed.
Foam-based shock absorbers are included both for the entire shells and the electronics package.

Most of the penetration is provided by kinetic energy and dense internal core. The shell structure allows to concentrate most pressure on the central zone, to improve the initial penetration. To assist it, the shell has a ring of priming explosively formed penetrators with tungsten liner, which disrupt the armor and defeat potential reactive or active protection. Depending on how the target is identified or specified, and where is the belt located, they are fired before entering the vessel or before the armor. The shell can explode in the preset location, which allows for "non-lethal" attacks on turrets or even the guns alone without damaging the rest of the vessel. However, due to the incendiary effect, such hit is best done externally, to prevent spread of fire inside.

LRS-4 is not designed to take major longitudinal shocks, however, and is essentially a hybrid between shell and missile. It requires especially careful launch, achievable only in the advanced mode, using pressurized gas for the first stage of launch, and explosions dampened by large layers of gas on the second and third stages. Preparations for LRS-4 launch take longer, and it requires more varied propellants in large quantity.


Specifications are as follows:

* Length: 15 m
* Weight of projectile: 55,000 kg

* Shell:

** High ballistic coefficient
** Nose-protecting blunted head for shock wave deflection
** Ablative ascent-stage and non-ablative descent-stage nose cone thermal protection
** Ceramics-polymer composite protection over sensors
** Tungsten-lined EFP priming warheads ring
* Main structure, from outermost to innermost:
** Ablative thermal protection
** Radar-absorbent structure+materials layer within silica cell structure
** Metal matrix composite (Al-based)
** Aluminium stringer matrix with boron nitride filler
** Metal matrix composite (Al-based)
** Depleted uranium pyrophoric and protective liner
** Internal structure with explosive confined in titanium matrix

* Explosive:

** 17,000 kg, SLX 5.3
** SLX 5.3: Highly stabilized mixture, load-carrying, extended effect, class 5, variant 3
** Composition: Triaminotrinitrobenzene, I9, hexafluoropropylene, CTM-TNA, polystyrene - content percentage as in VSM-3X; silicone rubber reinforcement agent
** Low toxicity, low toxicity fumes, minimal environmental impact, limited recyclability
** Impact insensitivity: over 9000
** Friction insensitivity: over 4000
** Thermal insensitivity: not sensitive
** ESD insensitivity: 900
** Explosion TNT equivalent: 14,000 kg
** Incendiary effect TH3 equivalent: 11,000 kg
** Anti-ship effect TPBE *(2):
*** 50 on unarmored ships with non-specific point hit
*** 70 on armored ships with non-specific point hit
*** 150 on unarmored ships with critical point attack
*** 250 on armored ships with critical point attack


- Full mode -

* Muzzle velocity: 3800 m/s
* Maximum range: 950+ km at 75 degree elevation (*3)
* Effective range: 950+ km at 75 degree elevation
* CEP: 5m, 6m with countermeasures
** Note: CEP on moving targets without proper prediction might degrade
* Practical RHA penetration, mm: Over 9000
* Barrel life spent per firing: 0.25%
* Cost: $27,500,000
* Shelf life: at least 95 years
** Electronics replaced each 20 years minimum, upgrade each 5 years recommended
* Distribution: Limited, request if needed



(*1) Warranty: For all projectiles offered, Vault-Tec guarantees that at least 95% will meet or exceed the performance figures stated, from first till the last shot, including at the end of barrel life. This is relevant to muzzle velocity, range, armor penetration, explosive effect, CEP with countermeasures. If they are not met, refund will be made, at percentage of underperformance.
[OOC: This means you can use programs to find more likely values. Warranty works if someone questions the capabilities, and proves them unachievable, though that's very unlikely, as they, relatively, have either been exceeded by actual lab-scale tests, or are exceeded by formula-based estimations.
Or take your timeline and add 1% to range for each year past 2000 (equivalent in NS). ]

(*2) TBPE = Thousand Pound Bomb Equivalent. The reference 1000lbs bomb, Mk.83, contains 200kg of Tritonal, providing 240kg of TNT equivalent, and 250kg steel casing. TBPE, like horsepower, should be used for comparative estimates only, since effect of multiple bombs depends greatly on type of ship and locations hit.

(*3) Vault-Tec will not comment in public on figures exceeding 3950m/s velocity, 950km range, 9000mm penetration.

Specifications are subject to improve without further notice.







Well, I developed in course of four weeks, out of them two actually working with it (particularly explosive compounds were tricky). If I do something, I do it to be the best in the class, not just good! Though in the LRS-4 shell, there's a lot inherited from VSM-3X missile, and I'll actually employ this explosive there.

The two of the shells are designed to engage SD-sized ships, and to the extent that a single shell will be a big alarm aboard, a few the final alarm. Unlike torps, which cause structure failure and often fast sinking, it's also a more humane way, ensuring that most crew members can get away. Except for ones hit by shell explosions, but, well, it's not a humanitarian mission. Also, high precision ensures that reactors damage can be prevented, and it can fire right at the turbines and propulsion systems instead. Or turrets, if one has different intents - this gun has no problems penetrating armor.

I'll make a better HE shell and some splitting ones for ground attacks later.









The thing is that it's not without LOS targeting - but rather uses ship recognition, radar and optical scan, laser active scan, and has pre-programmed order to engage the exact point.

Reactors on a SD are supposed to have their own armor, I think (every nuclear-powered ship has, power depending on class), not to mention heavy radiation protection.

The explosion of the shell is designed to fragment and ruin equipment of a compartment between armored bulkheads, and is made for that in all ways, but not to pass the armored bulkheads, unless detonated near them. Also, despite 17,000 kg of explosives in the LRS-4, they are actually very inefficient. HMX or RDX would be over two times better, TNT considerably better. Even such literally dirt cheap stuff as ANFO, mix of common cheap fertilizer and a little diesel fuel, explodes with more power.

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