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Gun at -10 elevation fits snugly in the shortened turret even at full recoil.
2GvCJAI.png
And at full elevation of +20 deg:
EqZWOpp.png
Only minor clipping of the frontal armor thanks to low-detail modeling. With minor changes the elevation could be +25.
If anyone's wondering, that's a 105mm L/50 gun, with a concentric recoil mechanism (basically, an M68 to within reasonable error)
The assumed recoil length is 350mm, a bit generous, if I make a light tank variant it'll have a longer recoil mechanism to reduce peak forces.
Also note that the holes for the coax and GSS clear metal in both maximum elevation and depression, so that works.

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.60cal M240s are the future, you know. Though I suspect that if your tank is as squished as you say, perhaps it's the BMG that isn't to scale.

f0H2n3g.png
Turret details on the way. Commander's cupola requires a fairly large hole, which makes the loader's hatch look a mite small. GPS well is designed for upgradability, being quite a bit larger than it needs to be.

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You were correct, actually, it was the scale of the M2 that was wrong.

This is where I'm at right now. The MGs and mounts are a mess, but perhaps that's how it will have to be for now. They should really be on flexible, erectable mounts, but whatever.

Some stuff is still missing and/or more simplified than I'd like. But I'm done for today.

 

t3G2CIJ.png

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The driver's access is extremely limited when the gun is overhead. At those angles however, the escape to the turret through the gunner's position is available.
There will probably also be a floor escape hatch.U3BQeKI.png

And now that I can no longer reasonably postpone it, I must go and crudely model a suspension.

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fQX20Xz.png

 

After 2 hours (and a total restart), this is what I have for the hull so far. 

 

3.1m wide, 1.4m tall, 7m long, 2m turret ring, 540mm tracks, side sponsons are to contain fuel cells and equipment (tow cables, shovels, spare track links, etc.).

 

Torsion bar suspension, 4 man crew, 85mm/55* front plate (148.2mm LoS), 45mm sides (not including upcoming sponson armor) 30mm roof and 20mm rear/bottom. 

 

Planned: low profile turret, 94/74mm L/40 squeezebore gun with loader assist device (cause I'm crazy), side skirts, engine/transmission/fuel tanks. 

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53 minutes ago, Sturgeon said:

So it looks like we have what? Six contestants with work already on the board, and two or three more who have entered? Not bad at all.

Agree, this look to be good running contest.

 

I expected to see more modern-tech-like take on designs, as according to contest althistory crap in OP designers know about it, just can't make/produce it.

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2 minutes ago, LoooSeR said:

Agree, this look to be good running contest.

 

I expected to see more modern-tech-like take on designs, as according to contest althistory crap in OP designers know about it, just can't make/produce it.

I've got quite a few plans, part of which is already reflected in the current design as seen and part of which isn't yet. For example, I chose the 105mm as I know ammo developments will keep it capable until at least late T-72 equivalent armor shows up; the internal layout of the hull is a bit more advanced than it looks, and the armor scheme isn't yet fully modeled.

There are more details, which I will point out in my final post, but rest assured that future tech is being considered.

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59 minutes ago, LoooSeR said:

Agree, this look to be good running contest.

 

I expected to see more modern-tech-like take on designs, as according to contest althistory crap in OP designers know about it, just can't make/produce it.

Ha, about all I managed was making the radio a transistor set :lol:

 

One interesting thing is how we all seem to have decided on skipping a generation ITO weight class. No 30-tonne vehicles here, just straight from 12 tonnes to 45. One wonders what the crews will make of it.

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13 minutes ago, Toxn said:

Ha, about all I managed was making the radio a transistor set :lol:

 

One interesting thing is how we all seem to have decided on skipping a generation ITO weight class. No 30-tonne vehicles here, just straight from 12 tonnes to 45. One wonders what the crews will make of it.

   There is no way to gauge reliability of each design, so 30 tons AFV are less interesting to design during those imaginary competitions. Maybe we will have a rule about decreasing reliabity with weight, in non-linear way for future competitions?  

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On ‎8‎/‎19‎/‎2018 at 8:57 PM, LoooSeR said:

   There is no way to gauge reliability of each design, so 30 tons AFV are less interesting to design during those imaginary competitions. Maybe we will have a rule about decreasing reliabity with weight, in non-linear way for future competitions?  

I'd say that, in this case, a 40 tonne tank isn't the worst choice. The Cascade Republic is fighting a two-front war, with one being defensive and one occurring over open terrain. This favours frontal armour and long engagement ranges (ie: firepower) respectively.

 

Additionally, the Californians are already fielding Sherman analogues, and will be fielding them with long 75 equivalents soon. There is no point up-armouring to a higher weight class that's already a generation behind the enemy's most common AT weapons.

 

Finally; the population and manufacturing capacity at play here (tens of millions of citizens, likely uneven industrialisation given that cars are common but not ubiquitous) mean that the two sweet spots for armoured vehicles are either many-but-very-light or few-but-heavy. This is because your logistics curve is somewhat sigmoidal and there's a zero-sum bottleneck on crew numbers.

 

So trying to field 10 000 30-tonne vehicles when your entire armed forces are probably less than a million men isn't possible. Better to have fewer, exquisite systems or many more very low-capability ones for the same logistics train than get stuck with a force you can't field.

 

Actually; for my money the best bet would be to concentrate on total army mechanisation over building isolated armoured forces, because that provides synergistic benefits well beyond what numbers of vehicles would indicate. Then keep a small core of top-of-the line vehicles around to stiffen advances or enable breakthroughs. This is pretty much the 'Hilux War 2' strategy.

 

For future, though: we might want to think about adding a criterion regarding what the technology of the day can accomplish ITO transmission and suspension components, and grade accordingly as the vehicles bump up against those limits.

 

Edit: having thought about the issue a bit more, I think total mechanisation might struggle a bit ITO fuel supplies. Then again, wood gas is totally a thing and my stereotype of the pacific northwest is that there are a lot of trees there. So your Hilux war army might end up looking like a lot of trucks and Jeeps with wood gas generators slapped on, and a few big tanks who get to hog all the petrol/diesel for themselves.

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pretty much done with the hull for now, gonna move on to the turret. 

 

Spoiler

q1gEePo.png

nWU1CyK.png

8o1ebmd.png

 

center of gravity included, haven't calculated mass yet (will probably edit it in). 

 

 

 

Edit: Mass= 14 metric tons (13.92), I was expecting more :D 

material= high strength, low alloy steel (7.850 g/cm3), so thoroughly average steel (the color is rubber green, cause @ApplesauceBandit already took the rusty red I wanted <_<

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I now have a basic suspension, Merkava-3 style (the springs aren't modeled yet). If anyone has a quick easy way to make a drive sprocket I'd love to hear it.
Also the surfaces left in the rough from casting now look the part.
aRoEk1K.png
The gun clears the sponson corners:
gZHRnEX.png
If anyone's wondering, those are M60 wheels cut down in width by about an inch.

The tank boasts a low-profile silhouette in hull-down positions:
nJBmPKR.png 

Edited by N-L-M
avoiding spamming
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3 hours ago, Xlucine said:

Can I compete with an ATG/AT-rocket and overweight light tank combo? Because given the terrain that looks like the better way of matching the threats

 

I don't see why not, though as Lost mentioned their ability to make decent ATGMs is nonexistent so you may effectively be stuck with RRs and rockets.

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5 hours ago, LoooSeR said:

   There is no way to gauge reliability of each design, so 30 tons AFV are less interesting to design during those imaginary competitions. Maybe we will have a rule about decreasing reliabity with weight, in non-linear way for future competitions?  

 

I don't see any reason reliability would be poor. The Jumbo Sherman worked fine and us about the same weight as most entrants.

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                                                                   ii.     No APFSDS currently in use, experimental weapons only - Spindle sabots or bourelleted sabots, see for example the Soviet BM-20 100mm APFSDS.
                                                                  iii.     Tungsten is available for tooling but not formable into long rod penetrators. It is available for penetrators up to 6 calibers L:D.
                                                                  iv.     Texan shaped charge technology - 4 CD penetration for high-pressure resistant HEAT, 5 CD for low pressure/ precision formed HEAT.
                                                                   v.     The subsidy-approved GPMG for the Lone Free State of Texas has the same form factor as the M240, but with switchable feed direction.. The standard HMG has the same form factor as the Kord, but with switchable feed direction.
      c.       Mobility
                                                                    i.     Engines tech level:
      1.      MB 838 (830 HP)
      2.      AVDS-1790-5A (908 HP)
      3.      Kharkov 5TD (600 HP)
      4.    Detroit Diesel 8V92 (400 HP)
      5.    Detroit Diesel 6V53 (200 HP)
                                                                   ii.     Power density should be based on the above engines. Dimensions are available online, pay attention to cooling of 1 and 3 (water cooled).
                                                                  iii.     Power output broadly scales with volume, as does weight. Trying to extract more power from the same size may come at the cost of reliability (and in the case of the 5TD, it isn’t all that reliable in the first place).
                                                                  iv.     There is nothing inherently wrong with opposed piston or 2-stroke engines if done right.
      d.      Electronics
                                                                    i.     LRFs- unavailable
                                                                   ii.     Thermals-unavailable
                                                                  iii.     I^2- Gen 2 maximum
                                                                  vi.     Texas cannot mass produce microprocessors or integrated circuits
                                                                 vii.    Really early transistors only (e.g., transistor radio)
                                                                viii.    While it is known states exist with more advanced computer technology, the import of such systems are barred by the east coast states who do not approve of their use by militaristic entities.
       
      Armor calculation appendix.
       
      SHEET 1 Armor defeat calculator 4in-54 1200 yd
       
      SHEET 2 Armor defeat calculator 4in-54 2000 yd
       
      SHEET 3 Armor defeat calculator 6in HEAT
       
      Range calculator
       
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