Jump to content
Sturgeon's House
Sign in to follow this  
Toxn

Competition: A modern medium AFV

Recommended Posts

Light Combat Vehicle(Tracked)  LCV(T)

 

At Priory General Technology, we have taken the proven and reliable FV 100 series of vehicles and have made them more suitable for the 21st century. We accomplished this by adding the latest Cummins B-Series engine that ups the horsepower from ~190 to ~350, replacing the majority of the exposed aluminum hull with layered Boron Carbide and a derivative of AMAP, we also have made the LCV(T) optimized for a varying array of electronic, weaponry, and add-on armor packages. 

 

The overall weight of the LCV(T) is expected to 8.5 tons. We emphasize the strategic mobility of the LCV(T) as we can transport 3 LCV(T)s in a single C-130 and they can even by lifted in by a CH-53 or equivalent. When having to fight in areas where heavy transportation is extremely limited, it is important the capability to deploy armored vehicles in sizable numbers in short order. 

 

The new armor for the LCV(T) is a combination of Boron Carbide and Aluminum that covers the sides, rear, and some of the belly of the vehicle and AMAP-B(medium) armor covering the frontal arch of the vehicle. The Boron Carbide/Aluminum armor provides a lighter alternative that purely aluminum while increasing the efficiency of the ballistic protection against heavy gunfire and shrapnel. The AMAP-B on the front of the vehicle is heavier than the original aluminum due to the sheer thickness of the new armor, however this armor protects the LCV(T) against most small cannon fire(<35 mm) and gives some protection against some lighter AT rocket propelled grenades. A variant of the AMAP-M(mine) covers the bottom of the crew compartment of the LCV(T) to protect against IEDs. The AMAP armor is projected to add some additional weight to our original chassis, but this is deemed minimal by our engineers due to the weight savings by the Boron Carbide armor and the increased horsepower. 

 

Additional armor can be placed on the vehicle including optional slat or net armor coverings that increase 360 degree protection against AT warheads, RHA steel plates to cover the frontal hull and the turret, NERA slabs, and has potential to have other varieties of armor packages. 

 

We have also tried to make the LCV(T) compatible with APS systems such as AMAP-ADS/SC, Iron Curtain, and Trophy. These will allow the LCV(T) to be able to fight in more high intensity environments with less casualties. 

 

Other hull modifications include improved driver viewing ports/hatch. Improved engine ventilation to make way for armor increase. Additional points on the hull were boxes for spare parts and tools can be held or can be used to attach floatation devices or even parachutes. And latches on the bottom of the vehicle wear V-shaped add-ons can be placed for IED rich environments. 

 

Our prototype turret also features modifications. First off the gun is a Cockerill 90 mm which is used around the world so ammo is common and is known to be effective against light armor. A coaxial FN 7.62 is also present. The mantlet of the vehicle has been modified to increase protection and to prevent clipping with the driver's hatch. A ballistics computer is integrated into the firing system to increase target acquisition speed and accuracy. The commander's hatch has also been improved in a similar way to the driver's and an adjustable post has been placed in order to provide the commander with firepower suited to his mission. The rear of the turret has been extended in order to store the 30-35 rounds of 90 mm. 

 

We plan to develop more turrets with varying arrays of weapons including light autocannons, mortars, ATGMs, AA guns + light MANPADS/SAM, 40 mm grenade(for riot control), and are even looking to develop a 105 mm gunned version of the LCV(T). 

 

We here at PGT have used modern armor and automotive technologies in order to improve the combat tested FV 100 series of vehicles. Our prototype LCV(T)-90 is faster(can reach speeds up to 55 mph), tougher, and hits harder than its predecessors did and has built-in room to grow to become suited for its combat role. 

 

Original Requirements:

  • Must be capable of protecting against small arms from all aspects, and must be capable of withstanding 20-30mm autocannon fire across the frontal arc.- CHECK
  • Must be capable of engaging and defeating existing AFV designs (not including modern MBTs) at modern combat ranges. - CHECK
  • Must be air-transportable using existing transport aircraft (preferably AC-130 or equivalent) in either a ready-to-run or partially disassembled state. - CHECK
  • Must be capable of defending against at least one strike by man-portable anti-tank weapons, including ATGMs - CHECK* 
  • Must include weaponry or equipment for engaging with dug-in infantry in urban areas - CHECK
  • Must be capable of defending against mines, roadside bombs and IEDs - CHECK*
  • Must be highly reliable, including servicing at local depots. - CHECK
  • Must cost the same or less than equivalent systems (around $4 million per unit maximum) - CHECK**
  • Must be capable of off-road travel -CHECK

Other Requirements:

  • May be capable of surviving multiple hits by heavy autocannon (40-60mm) across the frontal arc - X 
  • May be capable of engaging low-flying aircraft and helicopters - CHECK***
  • May be directly air-deployable from existing transport aircraft - CHECK
  • May be capable of surviving multiple strikes from anti-tank missiles (of all classes) from any angle - CHECK****
  • May include only COTs components - CHECK
  • May be capable of being serviced in the field. - CHECK
  • May be in the form of a family of vehicles sharing a common chassis - CHECK
  • May cost significantly less than equivalent systems (under $3 million per unit) - CHECK**
  • May be capable of extreme off-road travel, including across anti-tank ditches and the like - CHECK 

* - not guaranteed protection, but optimal protection. Vulnerable to heavier ordinance.

** - We estimate that the LCV(T)-90 is to be in the range of $2.5 million USD, however other variants and upgrade packages could increase the cost to ~4-5 million depending on the package. Advanced APS systems are costliest upgrade

*** - AA variant can engage aircraft

**** - With added slat/net, RHA, and APS systems we predict the LCV(T) can survive engagements even after being hit multiple times by AT missiles. However we cannot guarantee the success of these systems.

 

 

(OOC: poorly drawn)Artist Rendition of the LCV(T)-90

fwnG4Qq.jpg

 

Dimensions

Weight: 9.25 tons 

Height: 2.11 m 

Width: 2.135 m 

Length: 5.3 m

Crew: 3

Share this post


Link to post
Share on other sites

Despite it having minimal armor, the FV101 is an interesting vehicle. I was just going to replace all the aluminum with slightly think composites to make it withstand 20 mm and call it a day without doing anything else. Too bad I wanted MODULAR capabilities. 

Share this post


Link to post
Share on other sites

SW makes it really easy to do turret rotation and gun elevation/depression:

RfxamMr.png

The rear of the turret is actually clipping into the hull. I expected this, because the rear of the turret isn't really finished yet. However, you can see I have a mantlet now!

 

HpZAr7S.png

 

Weight is up to 23.56 tonnes.

Share this post


Link to post
Share on other sites

What program are you using for modeling?

I wouldn't advise Solidworks for noobs, since it can be a very very annoying program to work with. 

 

Try Spaceclaim. Made by the same dude that made the first version of Solidworks, before he allowed the French to fuck it up.

Share this post


Link to post
Share on other sites

This is now my official submission post. I'll update it as I go along. I'm gonna publish my worksheet and keep it up to date so you guys can follow along.

Neomedi Tank AKA "Baebrams" AKA OMGwell


Load 2 into C-17

Maximum figures:

Width: 5.28m

Height: 3.61m

Length: 25.96m / 2 = 12.98, / 1.1 = 11.8m

Weight (objective): 33 tonnes

Weight (do not exceed): 40 tonnes gross



Powerplant:

MTU 871 Ka-501

1200 shp, 2,600 RPM

Length: 1.350m

Width: 1.955m

Height: 1.085m

Mass: 1.700 tonnes, 4.300 tonnes (powerpack)



Armor:

Must protect against 30mm HEDP, 25mm RHA at 50deg penetration at 500m

39mm LOS thickness will be penetrated

AH-64 gun depression: -60deg

AH-64 attack angle for strafing run: -5deg

Tank needs 50mm armor plate sloped at 30 degrees from horizontal

40mm plate sloped at 6 degrees from horizontal

 

 

 

Armament:

75mm Autocannon L/50

240 rounds/min

 

150 rounds carried

 

long-recoil operation, fully recoiling barrel

 

fully stabilized

 

coaxial .30 caliber machine gun

 

Turret ring: 2.150m (same as M1)

Width: 3.350m, 3.920m w/ Relikt-L ERA

Hull height: 1.240m

Hull width: 2.160m

 

Hull length: 7.140m

 

Max elevation: 25 degrees

Max depression: -12 degrees

Uses standard Bradley 21" tracks and suspension elements, 7 per side
 

 

 

 

Weights:
 

Hull weight, bare: 11.82 tonnes 
 
Turret weight, bare: 6.37 tonnes
 
Mantlet weight, bare: 0.86 tonnes
 
Total armor percentage: 55%
 
ERA weight: Probably about 1.7-1.9 tonnes
 
Fender/side skirts weight: 0.49 tonnes
 
Gun weight: 1.144 tonnes (3.3%)
 
Ammunition weight: 0.810 tonnes
 
Fuel weight (230 US gallons): 0.696 tonnes
 
Powerpack weight: 4,300 kilograms (12.4%)
 
Track and suspension weight: 0.196 tonnes per roadwheel assembly (including torsion bars; 14 total, equals 2.744 tonnes), plus 3.560 tonnes for all track links. (18.2% for both tracks and suspension)
 
Total estimated weight (current): 34.7 tonnes
 
What a fat little baby.
 

 

Leopard 2:

Weight 2A6: 62.3 tonnes (68.7 short tons)
Length 2A6: 9.97 metres (393 inches) (gun forward)
Width 2A6: 3.75 m (148 in)
Height 2A6: 3.0 m (120 in)



Stingray:

Weight 22.6 metric tons
Length (With gun forward) 9.3 meters
Width 3 meters
Height 2.7 meters



ERA brick:

25 x 13 cm Kontakt-5

10.5 cm wide by 23.0 cm long by 7.0 cm thick

10.35 kg

Kontakt-5 (4S22): 251,9х131,9х13 mm 1.37 kg
I have made the turret not clip into the hull now. Consequently, weight was reduced by 0.1 tonnes.

 

 

854deb0d84.jpg

Size, weight and TNT equivalent of Kontakt, Kontakt-5 and Relikt light

 

 

Normal Relikt is 5.8 kg per sandwich. Length and width is the same as Kontakt-5, but thickness is unknown.

 

 

Also, the bottom one is actually Relikt 'light' (4S24), made for BMP-3s and such. Relikt (4S23) for heavy vehicles is, as I said, 5.8 kg per sandwich.

 

4S20 = Kontakt

4S22 = Kontakt-5

4S23 = Relikt

4S24 = Relikt 'light' (I dont know the official name)

 

bmp3_3.jpg

BMP-3 with a lighter variant of Relikt.

 

 

Stats and dimensions of those boxes:

5294bbdd6b.jpg

550x270x285 mm, 37 kg

 

 

 

Protection - eq. to 600 mm of RHA.

 

Share this post


Link to post
Share on other sites

Check the contact length of the track and the centre-centre distance of the tracks. With centre-centre distance I mean the distance between the centres of both tracks. That's basically the width of the hull, the width of the area between the (actual) tracks and half the width of the tracks. Contact length is, well, the length of the track that contacts the ground under normal loads.

 

Divide contact length by centre-centre distance and tell me the number. 

 

The higher it is, the worse. The optimum is 1, higher than 1 means difficulty with turning, lower than 1 means instability issues. But lower than 1 will never happen anyway, and higher than 1 will happen but isn't that big of a problem until you're into the higher numbers.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Similar Content

    • By Sturgeon
      The idea for a design competition predates SH itself, actually going all the way back to the 2011-2012 timeframe on the World of Tanks North American Forum. Before the Exodus of 2014, there were several tank design competitions, two of which I entered. Earlier today, I found my entries to those competitions saved in various forms on my computer, and I thought I would post them here for people to reference moving forward.

      Entered in: Design a Tank - 1938 Germany
       
      The Early History of the Mittlerer Panzer Greif
       

       
      In 1936, as Heinz Guderian was writing Achtung – Panzer!, he was solicited by the Heereswaffenamt Wa Prüf 6 to create a specification for light, medium, heavy, and super-heavy tanks, as part of Germany's ongoing re-armament. The tanks then in development, the Panzer III and IV, were seen as adequate for future needs, but the purpose of Wa Prüf 6's solicitation was to gain a greater understanding of upcoming panzer technologies and tactics.

      Guderian's submission eliminated the heavy and super-heavy categories entirely, in favor of fast light and medium tanks requiring large engines and excellent suspensions. Wa Prüf 6 immediately began design studies on panzers to fill these needs, while still allocating some effort towards a heavy breakthrough tank design.
      Early panzer designs focused on improving the existing Panzer III, but a special division of Wa Prüf 6, the Spekulativpanzerabteilung, was tasked with pushing the limits of what was possible. One design, the Mittlerer Panzer K, was selected for further study.
       
      The original MPK design used a forged armor steel hull welded together into an elliptical shape, which the Spekulativpanzerabteilung determined would give the best internal volume to weight ratio, providing the best protection, but still maintaining the high power-to-weight ratio specified by Guderian's white paper. Armor at the front was 30mm thick, sloped at around 45 degrees, for the hull. The turret was a simple welded design, mounting the latest 5cm L/60 high velocity cannon, while the suspension was torsion bar similar to the Panzer III, but with more roadwheel travel. Sighting was with stadia reticles, and the tank was powered by a 300 horsepower Maybach HL 120TR, which gave 15 hp/tonne to the 20 tonne tank.
       
      As Spekulativpanzerabteilung improved the design, it morphed beyond recognition. To improve the cross-country performance, the suspension was changed to an early form of hydropneumatic suspension, with more roadwheeltravel, mounted in units bolted to the side of the hull. A tank's mobility, SPA reasoned, was greatly affected by its ability to stay in repair, and thus the modular suspension was developed. Due to marginal increases in weight, the engine was modified to mount a supercharger, increasing the engine power to about 400 horsepower. A mockup was built, but a prototype was never completed.
       
      In early 1938, Germany intercepted Russian plans to build a tank in the 100 tonne range, with upwards of 100mm of armor. A requirement was set to build, as quickly as possible, a panzer that could counter such a behemoth. SPA's medium panzer design suddenly went from a low-priority technical study, to a full procurement program. No guns in the German arsenal could reliably penetrate 100mm of armor at combat ranges without special ammunition, so immediately a new gun was sought. Eventually, it was decided that a Czechoslovakian artillery piece, the 8cm Kanon 37, would form the basis of the new medium tank's armament. Production was licensed from Skoda immediately, and it entered service as a towed anti tank gun in June of 1938 as the 7.65cm Kanone 38. The Kanone 38 differed from the K37 by firing the same projectiles as the 7.5cm KwK 37, which had been adopted a year earlier for German AFVs, but at nearly three times the velocity (900 m/s). 
       
      Fitting this monster cannon to the MPK required a total redesign. The ambitious elliptical hull was kept, but everything else changed. The turret ring swelled to a (then-enormous) 175cm, and accommodated an advanced turret, mounting a reduced-weight variant of the 7.65cm PaK 38, the 7.65cm KwK 38 to sturdy forward-mounted trunnions, with low-profile recoil recuperators. The turret was a semi-elliptical tetrahedron shape, constructed from welded forgings, with dual stabilized, stereoscopic rangefinders for both the commander and gunner, something seen only on battleships at that time. The commander's cupola sported 360-degree panoramic periscopes with a Leiteinrichtung - or slaving device, to slew the turret onto new targets. Armor on the new turret consisted of eighty millimeters of frontal armor on the mantlet, with fifty millimeters all around protection. The hull armor's slope was increased to 60 degrees, and thickened to fifty millimeters to cope with the new generation of guns. The weight of the tank ballooned to 34 tonnes, and the suspension was completely redesigned as a new compound hydropneumatic/Horstmann design, called Schwebesystem, which utilized 60cm wide tracks. The old 400 horsepower turbocharged Maybach was not deemed sufficient to power this new tank, and so the suspension was lengthened by a roadwheel to accommodate the new Jumo 250 engine, a two-stroke turbocharged diesel, which produced 650 horsepower. Transmitting this power to the roadwheels was a brand new compact Merritt-Brown-derived transmission, with an automatic planetary gearbox, which allowed the tank to steer in place, as well as travel in reverse at 30 km/h. Upon an early prototype demonstrating this ability, Guderian exclaimed "sie bauen es!" - "build it!"
       
      The first prototypes of the newly renamed Mittlerer Panzer Greif rolled off the line in January of 1939. These new panzers were the last to be produced by Germany by the old method of batch production, and as a result, each was slightly different than the next. Full rate production would begin once testing was concluded in August of 1939, at the brand new WPW plant in Obendorf.
       
      Specifications, Mit.PzKpfw. V Greif Ausf. A:
       

       
      Dimensions
      Weight: 34 t
      Length: 6.95 m
      Width: 3.00 m
      Height: 2.85 m
      Armament
      Main armament: 7.65 cm KwK 38
      Caliber length (KwK): 55
      Tube length (KwK): 4.053 m
      Tube life: 500 shot
      Secondary armament: 1 × MG 34
      Cannon ammunition: 45 
      MG ammunition: 2700
      Armor
      Upper Hull: 50 mm / 60 °
      Lower Hull: 30 mm / 45 °
      Rear Hull: 25 mm / 90 °
      Hull Roof: 20 mm
      Hull Floor: 20 mm
      Turret Mantlet: 80 mm / 90 °
      Turret Front: 50 mm / 90 °
      Rear Turret: 50 mm / 75 °
      Turret Roof: 20 mm
      Mobility
      Engine: Jumo 250 six-cylinder turbocharged opposed two-stroke diesel, 650 hp
      Displacement: 16.63 L
      Gears (F / R): 7/5
      Power to weight ratio: 19.2 hp / t
      Top speed: 55 km / h
      Fuel storage: 720 l
      Reach: 525 km (road), 350 km (off road)
      Track width: 65 cm
       
      Leichter Panzer IV


       
      (The writeup for this one appears to have vanished into the aether, but I do recall that it was armed with a short 7.5cm gun and an autocannon!)
       
      Entered in: Design a Tank - NATO 1949
       
      NATO Medium Tank
       
      Concept: License-produceable medium tank "kit"
      By 1949, it had become clear that not only were tensions between the Warsaw Pact and NATO going to escalate, but that Soviet-aligned countries were actively readying for a full-scale conventional conflict. Because of this, the then-new civilian Operations Research Office was tasked with development of new weapons to be proliferated throughout - and, if possible license produced by - NATO member nations. The Armored Vehicles Team of the initiative, which was dubbed Project FOUNDRY, contained a scant seven members who began brainstorming ideas for a cheap, easy to produce, and eminently maintainable NATO-wide tank.
       
      Such a tank, it was reasoned, would not need to necessarily be the standard and only fighting vehicle of all NATO forces, but would allow less industrially capable NATO nations to defend themselves independently, as well as member nations who so chose to fast-track development of their own customized versions of the basic vehicle, without need for multiple lengthy, independent, and redundant tank development programs.
       
      While many concepts were explored, the one that gained the most traction was for a generously roomy welded chassis, with standardized turret ring dimensions, so that turrets and hulls could be exchanged at the depot level. Running contrary to current Army thinking, which emphasized small hulls with advanced, efficient transmission layouts, the concept had a large hull rear, supporting space inefficient, but widely available automotive components.
       
      As the AVT refined the design, they worked closely with British and American automotive engineers to try and create a design that could easily be adapted for the different automotive components then available, and projected. The design was intended from the outset to contain at least the British Meteor engine, and the Merrit-Brown Z.51.R transmission used in the Centurion. Because of this, the tank could not be made very much smaller than the Centurion, but this was deemed acceptable.
       
      The hull design received the most attention initially, and design of the turret and armament initially languished. The AVT had to solve, satisfactorily, the problem of producing specialized fighting vehicle components - the gun, turret, and sighting systems - in a variety of nations. Eventually, it was decided that the facilities in more developed countries, such as the US, Britain, France, and Germany, that could produce armed turrets and rings for all users, to be shipped abroad and mated to locally produced hulls.
       
      One further problem facing the AVT was ensuring the transportability of the new tanks by the various trucks, ships, and railcars that were in use at the time by member nations. The solution was to limit the weight of the new tank to 40 tonnes, enabling it to be transported by the majority of surplus wartime infrastructure.
       
      The resulting hull design was highly convergent with, but distinct from the British Centurion tank. The armor plates were to be rolled, heat-treated, and cut to shape by industrially capable member nations with the industrial capacity, and then shipped along with automatic welding equipment, if needed, to member nations for assembly. Each welded part assembled together using dovetails - like a cardboard model - to improve the strength of the welds, allowing for somewhat expedited welding practices. The turret ring race and other senstitive contact areas were finished before the plates shipped. When assembled, the hull used a series of mounting rails for engine and transmission, which approximated very nearly the modern "powerpack" concept, albeit in a much less space-efficient form. The driver's position was accommodating, with appreciable space as well as adjustable controls and seating, and power-assisted steering levers and shifter.
       
      Armor on the hull consisted of a two three-inch plates joined at a 60 and 45 degree from the normal, attached to side plates two inches thick set at an angle of twelve degrees, like the Centurion. Top and bottom armor plates were one inch thick, while the rear armor plate was 1.5" thick. Like the Centurion, there was provision for .25" thick standoff plates mounted to the side of the hull, encasing the suspension.
       
      The hull was to be furnished with automotive components in-situ, so there was no standard engine or transmission. However, most studies were done with either the British Meteor engine and Merrit-Brown Z.51.R transmission of the Centurion, or the AV-1790 engine with CD-850 transmission of the T40 experimental US medium tank. Special mention, however, should be made of the design study of the tank using a Ford GAA engine and syncromesh transmission from an M4A3 Medium, intended as a backup configuration in the event that a member nation could not obtain more modern engines and transmissions. In this configuration, the mobility of the tank would be significantly decreased.
       
      Suspension was provided via a series of mounting points to which suspension elements could be attached. The "default" suspension configuration was for an individually sprung Horstmann derivative, but the design accomodated both single and bogied forms, as well as internal and external torsion bar, Bellevile washer, and volute spring methods of suspension. Track pitch, width, and design were likewise left up to member nations, but most early scale models used standard US 6" pitch 24" wide T81 tracks.
       
      Ancillary components, such as stowage boxes, lights, fuel tanks, and other minor details, were to be produced by the receiving nations, with stamping equipment and technical know-how distributed as needed. 
       
      With all of the allowed variation, AVT realized it would need to publish an "engineering guide" to the new tank design, by early 1950 somewhat uncreatively christened the "NATO Medium Tank". This was accomplished with the first trials of automotive pilots, and "AN ENGINEERING GUIDE TO THE NATO MEDIUM TANK" was published by ORO on July 21st, 1950, and distributed to member nations. As the document only detailed the dimensional and production aspects of the tank, it was not considered a security risk, as member nations couldn't possibly leak any sensitive information from it that they did not already possess.
       
      By 1950, the first mild steel turret mockups had been created, giving two of the automotive pilots a "proper" look, even though they were no more combat capable than before. The turrets were cast in a single piece, and fitted with a 90mm high-and-low velocity gun based on the British 20 pdr but utilizing experience gained from the American 90mm series of cannons. It was determined that for member nations, the most common type of shot available would be solid APC shot. Because of this, a high velocity conventional AP round would be needed to deal with anticipated Soviet vehicles. The resulting round fired essentially the same T33 AP shot as the 90mm M3 gun, but at a much higher velocity of 3,200 ft/s. Testing revealed the round could penetrate a 100mm RHA plate at 60 degrees from normal 80% of the time at 500m. This was considered, initially, sufficient to defeat the anticipated armor of Soviet medium and heavy tanks.
      In order to allow more fragile, and thus higher capacity HE and utility (smoke) shells, ammunition was also developed for the gun that used a foam-lined, reduced volume case loaded with a smaller charge. This high explosive round produced 2,100 feet per second with its unique 22 pound shell, loaded with 2.6 pounds of Composition B high explosive. The technical data packages for these two types of ammunition were widely disseminated to member states, for their local production.
       
      The new 90mm gun was also compatible with any projectiles for the older M3 series of cannons, including HEAT and HVAP. Further, it was expected that the cannon would serve as the basis for a new 100-120mm gun, designed to fire a new generation of HEAT and APFSDS projectiles.
       
      Also included with the armament were three unity periscopes for each crewman, a single-plane stabilization system for the main gun, and a gunner/commander cowitnessing system. The turret had two ready racks of five rounds a piece, with additional ammunition stowage planned to be in the floor of the vehicle, and adjacent to the driver.
       
      The turret was cast with 3.5-3.6" all around armor, improving to six inches at the front. A large, wide mantlet/gun shield of 6" thick was provided, partially to help balance the gun in its cradle. The turret ring was 74".
      NBC protection was available through a "kit" modification that was distributed to member nations upon request.
       
      Specifications, NATO Medium Tank:
       

       
      Crew: 4
      Dimensions
      Weight: 39.4 t
      Length (Hull): 7.2 m
      Width: 3.4 m
      Height: 3.05 m (without roof MG)
      Armament
      Main armament: 90mm T104E3/M56
      Caliber length: 62
      Tube length: 5.60 m
      Tube life: 500 shot
      Secondary armament: 1 × M1919, M60, MAG, MG3, etc GPMG
      Cannon ammunition: 65
      MG ammunition: 3200
      Elevation: +25/-12
      Penetration with T53 Shot, 10.9 kg at 976 m/s:
      100 m: 22.2 cm
      500 m: 20.0 cm
      1000 m: 17.9 cm
      2000 m: 14.3 cm
      Armor
      Upper Hull: 76.2 mm / 30 °
      Lower Hull: 76.2 mm / 45 °
      Rear Hull: 38.1 mm / 90 °
      Hull Roof: 25.4 mm
      Hull Floor: 25.4 mm
      Turret Mantlet: 152.4 mm / 90 °
      Turret Front: 152.4 mm / 90 °
      Rear Turret: 90 mm / 90 °
      Turret Roof: 50.8 mm
      Mobility
      Engine: Depends on variant, often AV-1790 w/ CD-850 transmission or Meteor with Merrit-Brown Z.51.R transmission. Variant with Ford GAA and syncromesh transmission also trialled.
      Displacement: Depends on variant
      Gears (F / R): Depends on variant
      Power to weight ratio: Depends on variant
      Top speed: Depends on variant
      Suspension: Depends on variant
      Fuel storage: Depends on variant
      Range: Depends on variant
      Track width: Depends on variant
       
       
    • By LostCosmonaut
      Backstory (skip if you don't like alternate history junk)
       
      The year is 2239. It has been roughly 210 years since the world was engulfed in nuclear war. Following the war, the United States splintered into hundreds of small statelets. While much knowledge was retained in some form (mostly through books and other printed media), the loss of population and destruction of industrial capability set back society immensely.
       
      Though the Pacific Northwest was less badly hit than other areas, the destruction of Seattle and Portland, coupled with the rupturing of the Cascadia Subduction Zone in 2043, caused society to regress to a mid-19th century technology level. However, in the early 2100s, the Cascade Republic formed, centered near Tacoma. The new nation grew rapidly, expanding to encompass most of Washington and Oregon by 2239. The Cascade Republic now extends from the Klamath River in the south to the Fraser River in the north, and from the Pacific roughly to central Idaho. Over time, the standard of living and industrial development improved (initially through salvaging of surviving equipment, by the late 2100s through new development); the population has grown to about 4.5 million (comparable to 1950 levels), and technology is at about a 1940 level. Automobiles are common, aircraft are less common, but not rare by any means. Computers are nonexistent aside from a few experimental devices; while scientists and engineers are aware of the principles behind microchips and other advanced electronics, the facilities to produce such components simply do not exist. Low rate production of early transistors recently restarted.
       
      The current armored force of the Cascade Republic consists of three armored brigades. They are presently equipped with domestically produced light tanks, dating to the 2190s. Weighing roughly 12 tons and armed with a 40mm gun, they represented the apex of the Cascade Republic's industrial capabilities at the time. And when they were built, they were sufficient for duties such as pacifying survivalist enclaves in remote areas. However, since that time, the geopolitical situation has complicated significantly. There are two main opponents the Cascade Republic's military could expect to face in the near future.
       
      The first is California. The state of California was hit particularly hard by the nuclear exchange. However, in 2160, several small polities in the southern part of the state near the ruins of Los Angeles unified. Adopting an ideology not unfamiliar to North Korea, the new state declared itself the successor to the legacy of California, and set about forcibly annexing the rest of the state. It took them less than 50 years to unite the rest of California, and spread into parts of Arizona and northern Mexico. While California's expansion stopped at the Klamath River for now, this is only due to poor supply lines and the desire to engage easier targets. (California's northward advanced did provide the final impetus for the last statelets in south Oregon to unify with the Cascade Republic voluntarily).
       
      California is heavily industrialized, possessing significant air, naval, and armored capabilities. Their technology level is comparable to the Cascade Republic's, but their superior industrial capabilities and population mean that they can produce larger vehicles in greater quantity than other countries. Intelligence shows they have vehicles weighing up to 50 tons with 3 inches of armor, though most of their tanks are much lighter.

      The expected frontlines for an engagement with the Californian military would be the coastal regions in southern Oregon. Advancing up the coastal roads would allow California to capture the most populated and industrialized regions of the Cascade Republic if they advanced far enough north. Fortunately, the terrain near the border is very difficult and favors the defender;


      (near the Californian border)


      The other opponent is Deseret, a Mormon theocratic state centered in Utah, and encompassing much of Nevada, western Colorado, and southern Idaho. Recently, tension has arisen with the Cascade Republic over two main issues. The first is the poorly defined border in Eastern Oregon / Northern Nevada; the old state boundary is virtually meaningless, and though the area is sparsely populated, it does represent a significant land area, with grazing and water resources. The more recent flashpoint is the Cascade Republic's recent annexation of Arco and the area to the east. Deseret historically regarded Idaho as being within its sphere of influence, and maintained several puppet states in the area (the largest being centered in Idaho Falls). They regard the annexation of a signficant (in terms of land area, not population) portion of Idaho as a major intrusion into their rightful territory. That the Cascade Republic has repaired the rail line leading to the old Naval Reactors Facility, and set up a significant military base there only makes the situation worse.
       
      Deseret's military is light and heavily focused on mobile operations. Though they are less heavily mechanized than the Cascade Republic's forces, operating mostly armored cars and cavalry, they still represent a significant threat  to supply and communication lines in the open terrain of eastern Oregon / southern Idaho.


      (a butte in the disputed region of Idaho, near Arco)
       
      Requirements
       
      As the head of a design team in the Cascade Republic military, you have been requested to design a new tank according to one of two specifications (or both if you so desire):
       
      Medium / Heavy Tank Weight: No more than 45 tons Width: No more than 10.8 feet (3.25 meters) Upper glacis / frontal turret armor of at least 3 in (76mm) LoS thickness Side armor at least 1in (25mm) thick (i.e. resistant to HMG fire) Power/weight ratio of at least 10 hp / ton No more than 6 crew members Primary armament capable of utilizing both anti-armor and high explosive rounds Light tank Weight: No more than 25 tons Width: No more than 10.8 feet Upper glacis / frontal turret armor of at least 1 in thickness Side armor of at least 3/8 in (10mm) thickness Power/weight ratio of at least 12 hp / ton No more than 6 crew members Primary armament capable of utilizing both anti-armor and high explosive rounds  
      Other relevant information:
      Any tank should be designed to operate against either of the Cascade Republic's likely opponents (California or Deseret) The primary heavy machine gun is the M2, the primary medium machine gun is the M240. Use of one or both of these as coaxial and/or secondary armament is encouraged. The secret archives of the Cascade Republic are available for your use. Sadly, there are no running prewar armored vehicles, the best are some rusted hulks that have long been stripped of usable equipment. (Lima Tank Plant ate a 500 kt ground burst) Both HEAT and APFSDS rounds are in testing. APCR is the primary anti-armor round of the Cascade Republic. Either diesel or gasoline engines are acceptable, the Cascade Republic is friendly with oil producing regions in Canada (OOC: Engines are at about a late 1940s/early 50s tech level) The adaptability of the tank to other variants (such as SPAA, SPG, recovery vehicle, etc.) is preferred but not the primary metric that will be used to decide on a design. Ease of maintenance in the field is highly important. Any designs produced will be compared against the M4 Sherman and M3 Stuart (for medium/heavy and light tank), as these blueprints are readily available, and these tanks are well within the Cascade Republic's manufacturing capabilities.  
       
       
       
       
    • By EnsignExpendable
      Since I clearly have too much time on my hands, and Jeeps has a pretty cool tread going on, I decided that I'm going to do the same thing, but for T-34s. Here's a quick sample that I whipped up last night, I'm probably going to cover major exterior features of at least wartime T-34s and T-34-85s, then we'll see. I'll update the document in batches per organic time period rather than some arbitrary year-based cutoff. 
       
      Post constructive criticism and the T-34-iest pics you got
    • By Walter_Sobchak
      Today somebody sent me an email asking if I had any material showing what the bottom of the T-34 looked like.  Glancing through my books on the topic, none really show this view of the vehicle.  The guy asking is working on a series of T-34 models and wants as much detail as possible.  Anyone got something on this?
×