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Right, I think I have a pretty good idea of what the basic turret will look like. The front and cheek armor and ring are cast, the flanks, rear, roof, and under bustle are rolled.
qnZjONh.png

Structure estimated at 5.7 tons, not bad for an initial design. Combined with the hull being slimmed down to 13.3 tons, I get 19 tons so far. Assuming a ~50% armor weight fraction, that leads me towards 40 tons, which is a good place to be.
I should probably stop for the day.

EDIT: ballistic fixes bring me to 5.8 on the turret.
To prevent multiposting:
It seems I got my sizes a bit off, the turret is a bit too small for the hull.
TpicwI3.png

Edited by N-L-M
avoiding spamming
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I will be using Autodesk’s AutoCAD for my design, because I have a lower form of autism than the rest of you... and I have experience with it... but mostly the autism. Hopefully I can start creating tomorrow morning. 

 

Edit: can I use technology that might not be in the Cascade documents you so generously gave us, but was around (and in use) during the early 40s? 

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23 minutes ago, Lord_James said:

 

 

Edit: can I use technology that might not be in the Cascade documents you so generously gave us, but was around (and in use) during the early 40s? 

Yeah, any publicly available research can be used in development of your design. Although I like the thought that the nation's archives are just a bunch of shit that somebody printed out from SH, which was somehow the only thing to survive the nuclear apocalypse.

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5 hours ago, Lord_James said:

I will be using Autodesk’s AutoCAD for my design, because I have a lower form of autism than the rest of you... and I have experience with it... but mostly the autism. Hopefully I can start creating tomorrow morning. 

 

Edit: can I use technology that might not be in the Cascade documents you so generously gave us, but was around (and in use) during the early 40s? 

Actually, in the real world Autocad is full autism and normies use Solidworks/Inventor.

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SPG and SPAAG variants:

 

XM9 “Black Bear”

 

6HoRwvU.jpg

Basic statistics

  • Length: 6.6m (hull), 11.4m (total)
  • Width: 2.65m (hull), 3.25m (total)
  • Height: 2.5m
  • Weight: 48 t (combat weight)
  • Crew: 4 (commander, gunner, loader, driver)

Armour

  • 100mm (upper hull front)
  • 100mm (lower hull front)
  • 65mm (hull side forward)
  • 25mm (hull side rear)
  • 25mm (hull rear)
  • 25mm (hull roof)
  • 25mm (hull floor)
  • 100mm (mantlet)

Weapons

 

120mm L/50 cannon:

  • APHE: 23.9kg, 875m/s, ~200mm RHA penetration (90’, 500m)
  • APCR: 13.6kg, 1045m/s, ~300mm RHA penetration (90’, 500m)
  • HE: 21.7 kg, 500m/s
  • Movement: +/- 12 degrees horizontal, -10 degrees/+30 degrees vertical

Browning M2 heavy machine gun (hull roof)

 

Drivetrain

  • Engine: 18L, 500 HP (373 kW) V8 petrol engine (Ford GAA derivative)
  • Power/weight:  10.4kW/t
  • Max speed (road): 35km/h
  • Max sustained speed (offroad): 25km/h
  • Range: 300km

Description

 

F50yYdS.jpg

Sometimes you just need whatever is in front of your position to die. The M9 “Black bear” is designed to make everything in within range of its gun go away as efficiently as possible. Armed with a long 120mm gun (a calibre with special significance to Cascadians thanks to its storied history), this SPG is capable of punishing any presently fielded armoured vehicle out to long ranges with standard APHE. APCR, although not presently required, has also been developed in order to deal with any superheavy vehicles which may be developed in the near future. Finally, the gun has access to a very useful low-velocity HE round, along with more specialised rounds such as smoke and star shells.

 

The M9 is a casemate tank destroyer, with a 50cm superstructure on top of the hull to help accommodate the massive gun. The result is a vehicle is not much shorter than the tank it is based on. In terms of protection; the much higher slope of the upper front plate (60 degrees versus 45 degrees for the M8) provides a significant increase in survivability against threats from the front. Otherwise, the armour is the same as the base vehicle.

 

The superstructure and front plate, when combined with the massive gun, did unfortunately result in a significant increase in weight over the M8. As a result the front suspension needed to be strengthened and a new transmission system needed to be designed for the extra load. The latter was probably a good idea in any case, as this allowed neutral steering to be included in order to assist the gunner. The horizontal and vertical travel of the gun is about average for this sort of vehicle, and is adequate for the task at hand.

 

The interior of the crew compartment is relatively roomy, which is helpful given the increased burden on the loader. The main gun uses two-piece ammunition, which lowers the overall rate of fire somewhat but allows one man to load the main gun. Crew comfort is also increased thanks to a forced-air bore scavenging system, which significantly cuts down on smoke and fume buildup inside the vehicle.

 

Overall; the M9 is expected to serve in limited numbers compared to the M8, but should provide a very useful capability for engaging in defensive operations against heavy armour or offensive operations against fixed fortifications.

 

XM10 “Goshawk”

 

rcKpIkN.jpg

Basic statistics

  • Length: 6.6m
  • Width: 2.65m (hull), 3.25m (total)
  • Height: 2.8m
  • Weight: 20 t (combat weight)
  • Crew: 3 (commander, gunner, driver)

Armour

  • 25mm (upper hull front)
  • 25mm (lower hull front)
  • 25mm (hull side forward)
  • 15mm (hull side rear)
  • 15mm (hull rear)
  • 15mm (hull roof)
  • 15mm (hull floor)
  • 25mm (turret front)
  • 25mm (turret front side)
  • 15mm (turret rear side)
  • 15mm (turret rear)
  • 15mm (turret roof)

Weapons

  • 2x20mm autocannon (movement: -10/+80 degrees vertical)

Drivetrain

  • Engine: 18L, 450 HP (340 kW) V8 petrol engine (Ford GAA derivative)
  • Power/weight:  22.5kW/t
  • Max speed (road): 45km/h
  • Max sustained speed (offroad): 35km/h
  • Range: 500km

Description

 

N5NeMH3.jpg

The M10 is simply a light version of the M8 with an open-topped turret designed to hold two 20mm autocannon. The mount is based on the venerable ZSU-23-2 design, and has good movement in the vertical. The electric turret drive can push the turret through a full rotation in around 10 seconds, which assists in tracking fast-moving targets.

 

The M10 is expected to be useful when dealing with low-flying aircraft and infantry, and should fill a useful niche within the armoured force.

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6 hours ago, Bronezhilet said:

Actually, in the real world Autocad is full autism and normies use Solidworks/Inventor.

 

I completely forgot about inventor, which I strongly preferred over normal autoCAD. 

 

large.jpg?1483520474

 

Thanks for reminding me. 

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10 hours ago, Toxn said:

@LostCosmonaut I'm getting done with my SPG and SPAAG designs and have some keenness left over. Would it be okay for me to make a model of the Cascade Republic's existing tank?

I'm guessing that it looks something like a simplified M3 (or perhaps an M22), but you must correct me as necessary.

Sure, if you're up for it. M3 or M22 sounds about right,  I honestly didn't have a full design spec'ed out in my head beyond the approximate weight and armament.

''

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8 hours ago, Toxn said:

SPG and SPAAG variants:

 

M9 “Black Bear”

 

6HoRwvU.jpg

Basic statistics

  • Length: 6.6m (hull), 11.4m (total)
  • Width: 2.65m (hull), 3.25m (total)
  • Height: 2.5m
  • Weight: 51 t (empty weight)
  • Crew: 4 (commander, gunner, loader, driver)

Armour

  • 100mm (upper hull front)
  • 100mm (lower hull front)
  • 65mm (hull side forward)
  • 25mm (hull side rear)
  • 25mm (hull rear)
  • 25mm (hull roof)
  • 25mm (hull floor)
  • 100mm (mantlet)

Weapons

 

120mm L/50 cannon:

  • APHE: 23.9kg, 875m/s, 205mm RHA penetration (90’, 500m)
  • APCR: 13.6kg, 1045m/s, 299mm RHA penetration (90’, 500m)
  • HE: 21.7 kg, 500m/s
  • Movement: +/- 12 degrees horizontal, -10 degrees/+30 degrees vertical

Browning M2 heavy machine gun (hull roof)

 

Drivetrain

  • Engine: 18L, 500 HP (373 kW) V8 petrol engine (Ford GAA derivative)
  • Power/weight:  7.3kW/t
  • Max speed (road): 35km/h
  • Max sustained speed (offroad): 25km/h
  • Range: 300km

Description

 

F50yYdS.jpg

Sometimes you just need whatever is in front of your position to die. The M9 “Black bear” is designed to make everything in within range of its gun go away as efficiently as possible. Armed with a long 120mm gun (a calibre with special significance to Cascadians thanks to its storied history), this SPG is capable of punishing any presently fielded armoured vehicle out to long ranges with standard APHE. APCR, although not presently required, has also been developed in order to deal with any superheavy vehicles which may be developed in the near future. Finally, the gun has access to a very useful low-velocity HE round, along with more specialised rounds such as smoke and star shells.

 

The M9 is a casemate tank destroyer, with a 50cm superstructure on top of the hull to help accommodate the massive gun. The result is a vehicle is not much shorter than the tank it is based on. In terms of protection; the much higher slope of the upper front plate (60 degrees versus 45 degrees for the M8) provides a significant increase in survivability against threats from the front. Otherwise, the armour is the same as the base vehicle.

 

The superstructure and front plate, when combined with the massive gun, did unfortunately result in a significant increase in weight over the M8. As a result the front suspension needed to be strengthened and a new transmission system needed to be designed for the extra load. The latter was probably a good idea in any case, as this allowed neutral steering to be included in order to assist the gunner. The horizontal and vertical travel of the gun is about average for this sort of vehicle, and is adequate for the task at hand.

 

The interior of the crew compartment is relatively roomy, which is helpful given the increased burden on the loader. The main gun uses two-piece ammunition, which lowers the overall rate of fire somewhat but allows one man to load the main gun. Crew comfort is also increased thanks to a forced-air bore scavenging system, which significantly cuts down on smoke and fume buildup inside the vehicle.

 

Overall; the M9 is expected to serve in limited numbers compared to the M8, but should provide a very useful capability for engaging in defensive operations against heavy armour or offensive operations against fixed fortifications.

 

M10 “Goshawk”

 

rcKpIkN.jpg

Basic statistics

  • Length: 6.6m
  • Width: 2.65m (hull), 3.25m (total)
  • Height: 2.8m
  • Weight: 20 t (empty weight)
  • Crew: 3 (commander, gunner, driver)

Armour

  • 25mm (upper hull front)
  • 25mm (lower hull front)
  • 25mm (hull side forward)
  • 15mm (hull side rear)
  • 15mm (hull rear)
  • 15mm (hull roof)
  • 15mm (hull floor)
  • 25mm (turret front)
  • 25mm (turret front side)
  • 15mm (turret rear side)
  • 15mm (turret rear)
  • 15mm (turret roof)

Weapons

  • 2x20mm autocannon (movement: -10/+80 degrees vertical)

Drivetrain

  • Engine: 18L, 450 HP (340 kW) V8 petrol engine (Ford GAA derivative)
  • Power/weight:  17kW/t
  • Max speed (road): 45km/h
  • Max sustained speed (offroad): 35km/h
  • Range: 500km

Description

 

N5NeMH3.jpg

The M10 is simply a light version of the M8 with an open-topped turret designed to hold two 20mm autocannon. The mount is based on the venerable ZSU-23-2 design, and has good movement in the vertical. The electric turret drive can push the turret through a full rotation in around 10 seconds, which assists in tracking fast-moving targets.

 

The M10 is expected to be useful when dealing with low-flying aircraft and infantry, and should fill a useful niche within the armoured force.

That's got some Crusader AA heritage there.

 

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3 hours ago, LostCosmonaut said:

Sure, if you're up for it. M3 or M22 sounds about right,  I honestly didn't have a full design spec'ed out in my head beyond the approximate weight and armament.

''

Thanks.

Do you have a preference for colour schemes? I'm going with a dark olive green for the moment.

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I've got enough experience with direct modeling stuff like 3ds max, but it's the parametric stuff that I've not got much experience in.  @Sturgeon For the turret, was that mostly done through lofting?  Shapes like that were a complete pain to make in 3ds max, though I'd imagine they're not as bad in solidworks.  

For the hulls, did you just make that side profile cutaway first (like what you used to show off armor thicknesses) and then build off that?  Solidworks is a little more picky with how you go about making things than 3ds max is.

 

I do have a couple courses I'll be taking this fall over solidworks, though I'm going to guess that they're not going to be as in-depth as I'd like.

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Both the turret and hull began as sketches which were then extruded. To get the right contours I used extrude-cuts and revolve-cuts to sculpt away at the thing. You end up with open bits that way, but those can be filled with extrusions, etc. After that, I put like 500 fillets on it to make it look organic and cast.

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@LostCosmonaut, here's a what I came up with:

 

Light Tank M6

 

HZqKr4T.jpg

 

Basic statistics

  • Length: 5.08m, 5.18m (total)
  • Width: 1.65m (hull), 2.6m (total)
  • Height: 2.48m (40cm ground clearance)
  • Weight: 11 t (combat weight)
  • Crew: 4 (commander, gunner, driver, radio operator)

Armour

  • 25mm (upper hull front)
  • 25mm (lower hull front)
  • 25mm (hull side forward)
  • 10mm (hull side rear)
  • 10mm (hull rear)
  • 10mm (hull roof)
  • 15mm (hull floor)
  • 25mm (turret front)
  • 25mm (turret front side)
  • 15mm (turret rear side)
  • 15mm (turret rear)
  • 10mm (turret roof)

Weapons

  • 40mm L/50 cannon (movement: -15/+30 degrees vertical), 100 rounds stowed

                      APHE: 0.85kg, 790m/s, ~40mm penetration against RHA (500m, 90')

                      AP: 1.22kg, 790m/s,  ~50mm penetration against RHA (500m, 90')

  • M240 machine gun (coaxial), 1600 rounds stowed
  • M2 heavy machine gun (turret roof), 1200 rounds stowed

Drivetrain

  • Engine: 5L, 150 HP (112 kW) V8 petrol engine (Chevy small block derivative, because if there's one thing post-apocalyptic Americans will be able to make it's a small-block V8)
  • Power/weight:  9kW/t
  • Max speed (road): 50km/h
  • Max sustained speed (offroad): 30km/h
  • Range: 500km

dFgSlos.jpg

r3otc0q.jpg

 

Notes

  • The 40mm gun is essentially a 2 Pounder with access to solid AP, HE and canister (for scrubbing survivalists and tribals off your mate's vehicle).
  • A 55mm gun can be fitted, although it's awkward (as in, the breech is 20cm from hitting the turret ring at certain elevations). The vertical movement is also more restricted (-10/+20 degrees).
  • The hull is mostly welded while the turret, hatches and rear transmission housing are cast.
  • The turret ring diameter is 125cm.
  • The turret drive is manual, but I'd guess that later models include a powered drive of some sort.
  • The weird front hatch design is intended to include a pivot point and hinge. The hull crew is supposed to be able to flip up the hatch for better (but still protected) vision.
  • The transmission would be Cletrac-derived. So don't expect neutral steering.
  • My suggested name for it is 'Fox'. Mainly because this gives the troops plenty of scope for more entertaining nicknames (an older commander's vehicle is a 'Silver Fox', a female commander's is a 'Cougar' and so on).
  • It turns out to be quite a challenge to design something that looks functional but a bit primitive without it looking seriously goofy.

Qb9Wipp.jpg

0gc0Nj8.jpg

 

Acknowledgements: 

  • bAtsi
  • robboposh ..

Share link: https://drive.google.com/open?id=1dANQNANroc36WrI_hFOZT-Wt_ZDkhgGb

 

 

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