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PostPosted: Sun Feb 04, 2018 4:33 am 
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This is a concept for a postwar Fallout-universe tank. Most of the armor is salvaged from a Pulowski Personal Preservation Shelter, as seen in Fallout 3. I still have some details to add like the pioneer tools and tow hooks. While this one is in Brotherhood of Steel livery, the vehicle would not necessarily be faction-specific, though its manufacture would require a reasonably well-equipped workshop with reasonably skilled personnel, thus limiting which factions would be able to build and deploy them.

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Type: Fast Infantry Support Tank
Place of Origin: Post-Great-War America

Weight: 15.5 metric tons (17 tons)
Length: 5.02 meters (16 feet 6 inches)
Width: 2.47 meters (8 feet 2 inches)
Height: 2.26 meters (7 feet 5 inches)
Crew: 4 (Commander, gunner, loader, driver)

Armor: Hull: 20-50 mm (0.8-2 inches); Turret: 20-70 mm (0.8-2.75 inches)
Main Armament: 6-Inch Low Velocity Howitzer (Ammunition: 23)
Secondary Armament: Coaxial 7.62 mm Machine Gun (Ammunition: 2000)

Engine: Chryslus Atomic V-8, 350 hp at 3000 rpm
Power-to-Weight: 22.6 hp/ton
Suspension: Christie
Ground Clearance: 42 cm (16.5 inches)

Operational Range: 256 km at 32 km/h (160 mi at 20 mph)
Max Speed: 48 km/h (30 mph) on tracks; 90 km/h (57 mph) on wheels (Convertible drive)
Maximum Inclination: 31°
Turret Rotation Speed: 12°/s
Vertical Guidance: -10/20°
Reloading Rate: 25 seconds
Armor Penetration: Varies by ammunition type

Main Armament
1 x 6-inch Low Velocity Howitzer
● Ammunition Capacity: 23 Shells
● Gun Depression: -10°
● Gun Elevation: 20°
● Turret Rotation Speed: 11°/s
● Reload Rate: 25 seconds

Image

Ammunition
Improvised HE: Penetration 30 mm; Type HE; Velocity 290 m/s; Projectile Mass 15.9 kg; Fuse Delay 0.1 m; Fuse Sensitivity 0.5 mm; Explosive RE (TNT) 4.9 kg; Normalization 0°; Ricochet 50°/47°/45° (0/50/100%)

Cast HE: Penetration 50 mm; Type HE; Velocity 290 m/s; Projectile Mass 15.9 kg; Fuse Delay 0.1 m; Fuse Sensitivity 0.5 mm; Explosive RE (TNT) 6.5 kg; Normalization 0°; Ricochet 11°/10°/9° (0/50/100%)

Cast Mini-Nuke (low yield): Penetration 100 mm; Type Nuke HE; Velocity 290 m/s; Projectile Mass 15.9 kg; Fuse Delay 0.1 m; Fuse Sensitivity 0.5 mm; Explosive RE (TNT) 100 kg; Normalization 0°; Ricochet 11°/10°/9° (0/50/100%)

Cast Mini-Nuke (high yield): Penetration 200 mm; Type Nuke HE; Velocity 290 m/s; Projectile Mass 15.9 kg; Fuse Delay 0.1 m; Fuse Sensitivity 0.5 mm; Explosive RE (TNT) 1000 kg; Normalization 0°; Ricochet 11°/10°/9° (0/50/100%)

Secondary Armament
1 x 7.62 mm Machine Gun (Coaxial)

Armor
Type: Salvaged Rolled Homogeneous
Hull Front: 50 mm (10 - 34°) front glacis, 20 mm (71°) lower hull; Hull Sides: 50 mm fighting compartment, 30 mm (60°) upper, 30 mm lower; Hull Rear: 20mm (60°) upper, 20 mm lower; Roof: 20 mm.
Turret Front: 50 mm front, 70 mm gun mantlet; Turret Sides: 50 mm; Turret Rear: 50 mm; Roof: 20 mm;


Last edited by tpkc_klick on Thu Feb 08, 2018 1:55 am, edited 2 times in total.

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PostPosted: Sun Feb 04, 2018 8:36 pm 
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Very nice! Looks like the design is based off a Christie design that led to the T-34 series.

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PostPosted: Mon Feb 05, 2018 12:59 pm 
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The running gear is indeed based on the Christie system from the BT-series of tanks, and includes the convertible drive system to allow this tank to drive on its road wheels. I figured that the Christie suspension would give decent cross-country mobility while still being buildable with parts that could be scrounged up (the springs would be the toughest bits, everything else could be fabricated from scrap). I included the convertible drive system due to the fact that there are very few functional vehicles driving around in the Fallout universe, and I don't think a Vertibird is really up to the task of transporting even a relatively light tank, so this tank needs to drive wherever it goes. Being able to run on road wheels would speed up travel, make it more efficient, and reduce wear and tear on the tracks (which are not something that could be scrounged up, they'd need to be specifically manufactured). The tank should be able to run on road wheels without difficulty on most caravan trails, any reasonably intact prewar road, larger game trails, and any flat-ish hard-packed earth.

[Edit]
Now that I think about it, the suspension system could probably be modified to use leaf springs salvaged from semi trucks, rather than coil springs (I'm not sure there'd be a reliable supply of heavy-duty enough coil springs, whereas the trucks and their leaf springs are all over the place) . The tank already uses a some parts salvaged from such trucks, namely the road wheels and fenders. If the leaf springs for the cab drive wheels were cut in half (there are four per truck on the Fallout 4 in-game model), that would provide eight heavy-duty springs to go with the eight wheel hubs that you could pull off the same set of axles.


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PostPosted: Wed Feb 07, 2018 5:10 am 
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Would they not know the advantage of sloped armour or are these going to be the only tanks about?


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PostPosted: Wed Feb 07, 2018 12:02 pm 
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They'd certainly know about sloping armor, though finding nice, big, flat plates to slope would probably be difficult (think about where you'd find salvageable inch or more thick armor-grade steel plate in the present day, let alone the post-apocalypse). That's the major reason the heaviest armor on this vehicle is salvaged from a Pulowski shelter, which are a pretty common sight on the east coast, and thus why those plates are curved. And yes, there would probably be very few other operational ground vehicles around, let alone anything resembling other tanks (if I recall correctly, the only functional tank that shows up in any Fallout game is an old Sherman that the Brotherhood of Steel found somewhere in the Midwest and got running). This is the reason for the large-bore, low velocity main gun, which would be good for delivering large HE shells against fortifications and infantry formations, but somewhat useless against anything with real armor. It's also the reason for this vehicle's relatively light (by modern standards) armor, slightly heavier than most infantry fighting vehicles. The armor is strong enough to resist small arms fire up to and including most man-portable anti-tank rifles, but could still be penetrated by a solid hit from a rocket or a shot from a proper tank.


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PostPosted: Sat Mar 03, 2018 7:29 pm 
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A version with the turret turned and the hatches open, giving a nice view of the Chryslus Atomic V-8. There are still a few details I have to add in the side engine hatches.

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PostPosted: Tue Jun 19, 2018 11:05 am 
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Redid the tracks with a shorter pitch to allow for more slack.

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