Hakika si Kundi la Dudes Nyeupe (HKDN) Submission: Object 426 "Stumpy"
Table of basic statistics:
Parameter
Value
Mass, combat
54.8 mt
Length, combat (transport)
6.2 m/9.7 m (gun forwards)
Width, combat (transport)
3.8 m
Height, combat (transport)
2.6 m (to top of commander's hatch)
Ground Pressure, MMP (nominal)
114 N/m2
Estimated Speed
60 km/h on road, 40 km/h off-road
Estimated range
400 km
Crew, number (roles)
4 (commander, driver, loader, gunner)
Main armament, caliber (ammo count ready/stowed)
85 mm L/70 high-pressure gun (30 rounds in protected rack under blow-off panels in turret rear, 5 rounds in ready/emergency racks in fighting compartment)
Secondary armament, caliber (ammo count ready/stowed)
7.62 mm coaxial machinegun (1200 rounds)
12.5 mm machinegun (1200 rounds)
250 mm Large Universal Body (LUB) missiles (4 in armoured boxes on turret sides)
Vehicle designer’s notes:
HKDN's object 426 (provisional designation "Stumpy", provisional identifier "Xer") is intended to provide mobility, protection and firepower which meets or exceeds requirements at a low weight. It uses proven track, suspension, engine and transmission components, and combines them with innovations in firepower and protection to produce a superior fighting vehicle capable of taking on all comers.
Vehicle feature list:
Mobility:
1. Link to Appendix 1- RFP spreadsheet, coloured to reflect achieved performance.
2. Engine- 2x V-10 diesel (based on V-46-6 engine), 32.3 l displacement each, 650HP each, liquid cooled, coolant piped through armoured conduit to radiators in rear.
3. Transmission- planetary, synchromesh, hydraulically assisted (based on T-72), 7 forward gears and 1 reverse gear; engine forward; transmission to rear.
4. Fuel- diesel, 1350 l total capacity, stowage in forward hull and fighting compartment floor, 400 km estimated range, acts as additional armour against frontal attacks and mine blasts.
5. Engine bay is designed so that individual engines can be lifted out as power pack units. Transmission and engines are set up so that the tank can run even if one engine is disabled .
6. Suspension- torsion bar with hydraulic shock absorbers, 20-32 cm travel, 50 cm ground clearance, based on proven design of T-72.
Survivability:
Layout of armour and protective components:
Dark red - mantlet
Red - frontal arrays
Orange - turret side arrays
Gold - driver's side array
Yellow - fighting compartment side arrays
Green - roof array
Black - fuel
Grey - Automotive components: engines, drive shaft, transmission, radiators
Not shown - 25 mm HHA side skirts, 45mm base armour, turret basket, armoured ammunition stowage, armoured boxes for LUB missiles
1. Link to Appendix 1 - RFP spreadsheet, colored to reflect achieved performance.
2. Link to Appendix 2- armor array details.
3. Non-specified survivability features and other neat tricks - smoke grenades, use of fuel cells and radiators as armour, rear radiator housings double as large escape hatches for crew.
Firepower:
A. Weapons:
1. Link to Appendix 1- RFP spreadsheet, colored to reflect achieved performance.
2. Main Weapon-
a. Smoothbore cannon (510 MPa working pressure)
b. 85mm calibre
c. Ammunition -
Common: 75 x 500 mm composite case (158 mm at base), combustible case wall and steel case stub, 19-21 kg total round weight.
APHE-FS: 11.4 kg, 1000 m/s, 250 mm RHA penetration at 500 m, 210 mm RHA penetration at 2000 m.
APCR-FS: 3.2 kg, 1900 m/s, 330 mm RHA penetration at muzzle.
HEAT-FS (steel liner): 11.4 kg, 1000 m/s, 200 mm RHA penetration.
HEAT-FS (precision-formed copper liner, precision-formed explosive, wave shaper, improved fuse assembly): 11.4 kg, 1000 m/s, 350 mm RHA penetration.
HE-FS: 11.4 kg, 1000 m/s, ~15 mm RHA penetration
d. Ammo stowage arrangement- 30 rounds in 3 linear racks in turret rear. Racks are behind armour and under blow-off panels. 5 rounds in emergency/ready racks scattered around fighting compartment. Racks are motorised to bring rounds forwards to front of rack. Loader accesses rack using motorised door.
e. FCS- gun is electro-hydraulically stabilized in 2 axes (based on T-72). Maximum gun elevation/depression is +20/-5 degrees.
f. The high-pressure 85mm gun allows rapid-fire engagement of multiple targets thanks to its high velocity and lightweight ammunition. Penetration is sufficient to deal with most threats at combat ranges, with high-priority targets being engaged by LUB missiles. A standardised muzzle velocity simplifies aiming when switching ammunition types. The APCR-FS uses an aluminium body, 28x420mm maraging steel core and 13x51mm tungsten alloy tip to provide a high-penetration kinetic round for close-in combat (0-500m).
3. Secondary weapons-
a. 7.62 mm coaxial machinegun, 1200 rounds
b. 12.5 mm machinegun, 1200 rounds, mounted in rotatable pintle on commander's hatch.
c. 4 x 250 mm LUB missiles (described further in Appendix 3)
4. Link to Appendix 3 - Weapon system magic. This is where you explain how all the special tricks related to the armament that aren’t obviously available using Soviet 1961 tech work, and expand to your heart’s content on extimated performance and how these estimates were reached.
B. Optics:
1. Primary gunsight - stabilized gunner's sight in turret roof. Stabilization is 2-axis, with gun calibrated to sight (described further in Appendix 3)
2. Secondary optics -
Secondary telescopic mounted coaxial to gun.
Observation periscopes for commander and loader. Commander's periscope is stabilized.
Vision blocks in commander's hatch.
C. FCS:
1. Main gun fire control is fairly conventional aside from sight-slaving system. Missile fire control is via main or secondary gun sight, with radar/optical aiming system mounted coaxial to gun.
2. Link to Appendix 3 -weapon system magic
Fightability:
1. Large commander's and loader's hatches improve ingress/egress. Rear hatches allow rapid evacuation and assist in reloading vehicle.
2. Small size and weight of vehicle increases strategic mobility. Low ground pressure and high power-to-weight ration increases tactical mobility.
3. Larger number of crewmen and design of engine bays improves serviceability of vehicle.
4. Smaller main gun increases number of rounds which can be stowed, eases ammunition handling.
5. LUB missiles provide one-hit-one-kill capability against any and all likely targets. The large, modular design of the missile body allows it to be upgraded over the life of the vehicle.
6. The use of known automotive, suspension, gun and optical components based on the venerable T-72 design eases development time and increases reliability.
Additonal Features:
Additional and optional features are detailed further in Appendix 3. These include a smaller-diameter missile to replace the LUB missile, a 145mm low-pressure gun to replace the 85mm gun, a commander's stereoscopic rangefinder and an addon ERA package.
Free expression zone:
"As leaves gently fall
so too will Cascadia,
thanks to our big stick."
- dedication by the design team of HKDN to Object 426 project
HKDN senior design team engineers on Object 426 project. Left to right: Chadina Blake-Smythe, Sora Jina-Bandia and Ukelele Brown-Davis.
Vehicle designer’s notes: As chief designer of the 2250 Heavy Tank program at SNVZ, we had spent quite some time theorizing about ways to remedy the, frankly, superiority of the Cascadian "Norman" Medium Tank over current Californian vehicles. Our design needed to not only meet the Norman, but exceed it, by enough to ensure that no simple upgrades of the Cascadian design could undermine the qualitative advantage our design held. Where the Norman is, in many ways, a radically re-designed and improved T-55, SNVZ decided to take a similar approach with the far superior T-72. The result is a robust, light weight, technologically advanced, and astoundingly lethal vehicle which can be comfortably operated in all environments which it could expect to face, from the heat of the Mojave to the alpine chill of the Sierra Nevadas.
2. Engine- EVDS-2230-2 V-12, 2,230 cubic inch, 1,562hp, water cooled, FADEC, electronically controlled fuel injection, and twincharged.
3. Transmission- CD-1750 crossdrive-type eight-speed manual gearbox, mounted in VPK-3B powerpack, able to handle much greater power.
4. Fuel- Type, Automotive diesel, 1,200L + 416L stowed in the hull and in auxiliary quick-detach barrels at the rear hull, 460km internal/720km with aux tanks, auxiliary tanks can be jettisoned remotely from driver or commander's position.
5. Under-armor APU (52hp, 15kW), mechanical cooling system for driver-mechanic.
6. Suspension- Torsion-bar, +325mm/-125mm travel, 490mm ground clearance, rotary-type shock absorbers on all arms, modularized easily-replacable design.
Survivability:
1. Link to Appendix 1 - https://mega.nz/#!IQhH3YJA!kXnIfS2rWaeVaA1hM8ouQwpfTQ08K4qW3jNOIY8a_Ig
2. Link to Appendix 2- armor array details: https://mega.nz/#!IRhBUaDS!6a01a-Z6tpCzOeqzdGqxoo9poVTBN4RQ-nMIRHVabQU
3. [In Spoiler Box]
Firepower:
A. Weapons:
1. Link to Appendix 1- https://mega.nz/#!IQhH3YJA!kXnIfS2rWaeVaA1hM8ouQwpfTQ08K4qW3jNOIY8a_Ig
2. Main Weapon- 2A35 (image in spoiler tag)
a. Type: Smooth Bore Tank Gun
b. Caliber: 125mm L/48
c. Ammunition types and performance (short)
3BR1 APCBC-FS [Modified BR-472 projectile at 1,245m/s]
3OF1 HE-FS [950m/s]
3OF2 DEMO-FS [It’s a oversize HE round to replace the venerable 152mm assault gun in urban combat]
3BK1 Tandem-charge HEAT [55/115mm HEAT, 915m/s]
3BK2 Triplex-charge HEAT [85/115/115 HEAT, 915m/s]
3UBM3 AP-SFRJ: See Appendix 3 for details
3BM2 Hypervelocity Threat Projectile Testing Object: (750x50mm rod at 1,580m/s)
3BM3 Hypervelocity Threat Projectile Testing Object: (850x36.4mm segmented rod at 2,000m/s)
d. Ammo stowage arrangement
The AL-type carousel-pattern automatic loader is capable of handling cartridges of 950mm overall length (technically 975 is the physical limit, but it is believed that a 950mm cartridge overall length limit allows significant room for growth while leaving some clearance inside the autoloader). It services the gun in circa 6 seconds, providing a reliable 10-round-per-minute rate of fire. It is fed by a 30-round carousel, with the cartridges arranged vertically around the turret ring. Reloading the autoloader carousel is conducted by the crew, and most of the shells are a single-person lift. Some of the more exotic types, including but not limited to 3BR1, 3BK2, 3OF1, 3OF3, and 3UBM3 are shipped separately as two pieces, and assembled during loading into the autoloader carousel due to the high projectile weight.
The vehicle is provided with two hull ammunition racks flanking the driver, which are not able to be loaded from in combat and are NOT capable of storing 3BK2, 3OF3, or 3UBM3. The autoloader separates the turret basket from the hull with a steel splinter-protective bulkhead of 5mm thickness and the driver is unable to maneuver those sorts of ammunition through the loading hatch. Total ammunition stowage for the main gun is 45 rounds, 30 in the autoloader and 15 in the hull storage racks.
e. FCS- relevant systems, relevant sights for operating the weapon and so on.
f. Neat features. -- See Above
3. Secondary weapons-
Coaxial PKT:
Feeding from left to right with a disintegrating link belt. Mounted in the Mk.18 mount, and provided with 4000 rounds ammunition, of which 2000 is ready. Integrated into the main gun FCS.
Commander's KPVT:
The commander is provided with a 14.5x114mm KPVT heavy machine gun mounted to the cupola, with a sighting and control system for use while under armor. This is provided with 100 rounds of linked ready ammunition, and a further 400 rounds stowed in the turret basket in ammunition cans, with provision made to stow extra ammunition cans to the turret roof for quick reloads. The commander’s KPV can also be used as a manually operated anti-aircraft gun. It was chosen to provide a range overmatch against Mormon forces, as the 14.5x114mm cartridge possesses nearly twice the muzzle energy of the 12.7x99mm round, and has commensurately better long range performance. The Commander’s machine gun is provided with a 1-8x variable power periscopic optical system for use under armor, and back-up iron sights. Control is through electric motors and geared drive, and the gun can be slaved to the sight. It provides light vehicle and anti-infantry capability to 3,000m. The mount is fully stabilized and is able to be used effectively while on the move, and incorporates F50 NGVII image intensifying tubes
4. Link to Appendix 3- Weapon system magic. (Also APS system and Semiconductor production) https://mega.nz/#!EBRiRQ6Q!5wYPI0yDpF_8qGgA5KHUR1cHtbtmdFy8nxn5XOECdHc
B. Optics:
1. Primary gunsight
The TPD-2-49 stereoscopic rangefinding sight assembly is a fully stabilized rangefinder and gunsight with day / night capabilities. Day sighting is provided by two sights, a high field of view periscopic unity sight and a 3 to 12 power variable magnification periscopic sight with illuminated reticle. Night sighting is provided by F50 image intensifying tubes mounted in both the periscopic portion of the sight assembly and in the rangefinder. (F50 is part of the Night Vision Generation II image intensifier program discussed in Appendix 3, Part D: Electro-optical Program Night Vision Generation II.) Provision is made for the replacement or augmentation of the image intensifying system with a thermal imaging system when such a system is ready. The sight is arranged so that replacement of the stereoscopic rangefinder with a laser rangefinder system is possible.
Range information from the TPD-2-49 is automatically transmitted to the 7M13 FCS and is included in the gun-follows-sight control scheme: the ballistic solution is continuously updated by the 5E1 and the gun aimed as the range is dialed in. As a result, firing can take place immediately after the correct range is found.
2.
The commander’s hunter-killer cupola with TDD-3 optical complex is provided with a 1-8x variable power periscopic optical system for use under armor. Control is through electric motors and geared drive, and the 125mm gun can be slaved to the sight (commander's override). In combination with the 14.5mm KPVT machine gun, TDD-3 provides light vehicle and anti-infantry capability to 3,000m, as well as hunter-killer and slew-to-cue capabilities. The mount is fully stabilized and is able to be used effectively while on the move, and incorporates F50 NGVII image intensifying tubes for night operations.
C. FCS:
1. List of component systems, their purpose and the basic system architecture.
TPD-2-49 244cm coincidence rangefinder-sight (GCRS) complex
TDD-3 Commander’s Independent Rangefinder-Sight (CIRS) complex
7M13 Electronic Fire Control System
5E1 Turret/Weapon Management Computer (TWMC)
2. Link to Appendix 3- weapon system magic, if you have long explanations about the workings of the system. https://mega.nz/#!EBRiRQ6Q!5wYPI0yDpF_8qGgA5KHUR1cHtbtmdFy8nxn5XOECdHc
Fightability:
1. List vehicle features which improve its fightability and useability.
Low Crew Requirements
Turret armor defeats >BGM-1 60/160 CE and ≥500mm KE to 161.5° of turret traverse
High Degree of Automation
Improved battlefield accuracy and see-shoot time through digital FCS
Autoloader allows true Fire / Load on the move capability
Excellent night-fighting capacity through the provision of Gen-III Equivalent I2 tubes, both in the vehicle and for personnel.
Digital systems improve maintenance and wear tracking, allow better supply chain management
Power-Pack enables fast maintenance
Turret modular armor package design eases growth / upgrades and battle damage repair
Semiconductor advances allow rapid development of advanced computing systems
Guided KE ramjet round lethal at extended ranges, quite accurate, short flight time
Light weight eases infrastructure wear from training maneuvers, increases strategic/operational mobility
Small silhouette - Turret exposes same frontal area turned up to 40 degrees off centerline
Advanced armor suite and crew Force-Multiplication measures (hard-shell crew helmet, dual-tube night vision devices)
Advanced digital radio encryption for safe battlefield communications
Text-Messaging through the radio system extends communication range where voice TX is unintelligible
Additional Features:
Feel free to list more features as you see fit, in more categories.
Crew Comfort
Upgradeability
Free expression zone: Let out your inner Thetan to fully impress the world with the fruit of your labor. Kindly spoiler this section if it’s very long.
SNVZ design and pre-production staff, including comrade-academicians, comrade-engineers, and comrade-military-technical-advisors. Photo by Comrade Political-Moral Officer Lt. Col Allin Smythee-Redacted, PAFDPMR
