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PostPosted: Sat Aug 13, 2011 4:15 am
by Samozaryadnyastan
T-90 are $2-4 million, and T-80 derivatives are probably under 6.

PostPosted: Sat Aug 13, 2011 4:35 am
by Munathanura
Crookfur wrote:Munathanura: Darn you and your inconvenient facts ;)

But my thanks to sister RRoan for helping spread the good news of the 40mm CTA church ;)


I'm pretty close to being converted, tbh. One last obstacle stands in the way, and that's the feed system. Both a US army analysis and this Thales presentation have the feed system as linkless. Would it be possible to reload the system in the field, or would it require the vehicle to be back at base?

Samozaryadnyastan wrote:T-90 are $2-4 million, and T-80 derivatives are probably under 6.


Go for the T-84 if you're going to go for a T-80 derivative. Ignore the T-90 unless you really want it cheap.

PostPosted: Sat Aug 13, 2011 4:40 am
by Australien
Senestrum wrote:
Australien wrote:Anyone have a suggestion for a good MT MBT that isn't ludicrously expensive (Around $6 million max) and functions well in all-terrains?
My army is pretty infantry-centric, so maybe that would help.

Currently looking at the Leopard 2, because I have a serious fetish for German/European weaponry.


That might, maybe, get you a new-build stock Leo2A6. Any newer variants or upgrades are going to be well out of that price range (most expensive production Leo variant I'm aware of cost more than twice your limit, lol).

You should strongly consider going used or eastern if you want a tank under 6 million.

I've got nothing against going Eastern, but why would just getting a stock 2A6 be a problem?

PostPosted: Sat Aug 13, 2011 4:53 am
by Licana
Australien wrote:
Senestrum wrote:
That might, maybe, get you a new-build stock Leo2A6. Any newer variants or upgrades are going to be well out of that price range (most expensive production Leo variant I'm aware of cost more than twice your limit, lol).

You should strongly consider going used or eastern if you want a tank under 6 million.

I've got nothing against going Eastern, but why would just getting a stock 2A6 be a problem?

It shouldn't be.

PostPosted: Sat Aug 13, 2011 5:03 am
by Australien
Licana wrote:
Australien wrote:I've got nothing against going Eastern, but why would just getting a stock 2A6 be a problem?

It shouldn't be.

Unless I want to horde tanks, that is.

PostPosted: Sat Aug 13, 2011 5:08 am
by Licana
Australien wrote:
Licana wrote:It shouldn't be.

Unless I want to horde tanks, that is.

T-55 zerg rush gogogogogo.

PostPosted: Sat Aug 13, 2011 5:10 am
by Vitaphone Racing
Samozaryadnyastan wrote:
Vitaphone Racing wrote:Attention bitches

Will someone who knows what they are talking about please flick through this design and then decide whether it would be worth scaling it up to create a viable diesel-electric powertrain for a heavy tank.

Forza Boxer 6 Cylinder Twincharged (Supercharged - Turbocharged) Diesel Hybrid Engine - FB-6TSDH

The FB-6TSDH engine is a diesel-electric hybrid six-cylinder boxer engine displacing only a mere 9.2 Litres yet producing nearly 500kw of power employing the Internal Comustion Engine only, and over 700kw with electric power boost. The hybrid system, Forza's own HybriDrive technology, not only ensures that the vehicle is one of, if not the, most powerful, fastest and fastest accelerating IFVs in it's class, but, when teamed small displacement internal combustion engine, also makes it one of the most fuel efficient armoured fighting vehicles ever produced.

The main reason for the immense power output of the Forza FB-6TSDH engine is the teaming of it's high-boost forced induction system along with it's very high compression ratio. For a direct commonrail injected diesel engine, this version of the FB-HTSD posseses a ratio of 23.5:1, essentially meaning the engine compresses 1540 cubic centimetres of fuel and air mixture into 63 cubic centimetres in every cycle. The compression ratio is acheived by long stroke of the existing FB-6TSDH powerplant. Because of this very high ratio, this called for the cylinder block to be manufactured with very thick cylinder walls in order to maintain it's structural integrity. Despite it's low displacement, the FB-6TSDH weighs no less than a similarly powerful 20 litre engine when one factors in the additional weight of the HybriDrive system, although consuming much less fuel.

To further boost power, the maximum boost of the turbochargers was set 1.6 bar, which creates a significant increase in power when the turbochargers are active higher up the rev range, but due to the nature of a twincharger engine, makes no difference in low engine speeds due to the supercharger being the sole provider of forced induction.

Forza engineers designed the FB-6TSDH as a six cylinder boxer, although a twelve cylinder was the preferred choice by the Anago-Yohannesian Kaissereich, simply because it allowed more space for the HybriDrive system to be fitted. The risk of a cylinder failing was more or less written off as a risk due to the presence of the battery pack and electric motors which could propel the vehicle to safety in case the worst came to the worst.

The pistons are arranged in a boxer layout which is a layout seldom seen except for several high performance sports cars. A flat layout, which is more commonly seen, is near identical in appearence and theory to a boxer engine; there is still a 180 degree angle between the two seperate banks of pistons, however a boxer engine mounts two opposing pistons on two different crank pins as opposed to a flat engine which mounts two pistons on the same crank pin.

Thus, a flat layout is best described as a 180 degree V engine and not a true boxer engine. Boxer engines are reknown for having superb balance and are unique in that a boxer engine does not require counter balances at all on the crank shaft as the engine has superb natural balance. This is further enhanced by the use of twelve cylinders. Boxers are so named because when one looks at the engine from down the crankshaft, the two banks of cylinders will appear to be boxing one another.

The induction system is a variant of Forza's TwinCharger system; a single Roots-type Superchager is used to aspirate the engine at low RPM's with two Turbochargers, one for each bank of cylinders, aspirating the engine further down the rev-range. TwinCharging systems have a number of advantages over other forms of forced induction. Unlike Turbocharged engines, Twincharged engines do not experience turbo-lag, where the turbochargers are ineffective because they are not at operating speeds.

Unlike supercharged engines, twincharged engines can decouple the supercharger from the engine so that it won't drain power to operate while still maintaining boost from the turbochargers. The two forms of forced induction do not operate in parallel in a bid to avoid the extremely high manifold temperatures which would be produced by the supercharger blowing into the turbocharger. As such, the supercharger is decoupled as soon as the turbocharger activates on the FB-6TSDH. The TwinCharger system alone allows the vehicle to have constant boost and thus give exceptional acceleration at all engine speeds; something crucial for a battlefield environment.

The engine block itself is made from aluminium alloy, comprised of 11% silicon, 4% manganese and 0.5% magnesium. This Al-Alloy has a high thermal conductivity and hence is able to dissipate heat quicker than cast iron. Also, it leads more thermal efficiency, cooler running engines and are lighter thereby improving the overall vehicle’s operative characteristics.

In total, the engine has a total displacement of 9,240 cubic centimetres or 9.24 Litres, which equates to 1.54 Litres per cylinder. This version of the FB-6TSDH, with its high compression ratio and boost pressure creates a specific output of 54kw/litre, which combines to form a total output of 499kw. This is only the power of the internal combustion engine.

Exhaust fumes and gases are passed out the rear of the tank, through a double muffler and particle filter. Exhaust gases are diluted with outside air to reduce their heat signature. This is done by sucking air through a small inlet flush against the tank and mixing the cool outside air with the exhaust gases. Exhausted and outside air meet in a special Y tube, with a radiator being mounted on the stem of the Y, sucking air from both stems through to the exhaust.

Sound-deadening engine covers are also fitted to the engine to reduce the noise both inside and outside the cabin. Forza engineers are normally ardent at reducing the NVH of large luxury cars but found the same basic principles applied to armoured vehicles. Double-insulated sound covers are placed in a box to cover the engine, which is itself mounted on springs to quell vibrations. The top of this box can be easily removed to lift the whole engine out. As a result, the vehicle, similar to the AY1 MBT, is drastically quieter inside and out than the majority of most if not all other infantry fighting vehicles.

The Forza HybriDrive replaces a normal geared transmission with an electromechanical system. Because an internal combustion engine (ICE) delivers power best only over a small range of torques and speeds, the crankshaft of the engine is usually attached to an automatic or manual transmission by a clutch or torque converter that allows the driver to adjust the speed and torque that can be delivered by the engine to the torque and speed needed to drive the wheels of the car. For classification purposes, the gearbox can be described as an Electronic Continuously Variable Transmission, or EVT.

The HybriDrive system replaces the gearbox, alternator and starter motor with a three-phase brushless alternator serving as a generator, two powerful motor-generators, a computerized shunt system to control the afforementioned devices, a mechanical power splitter that acts as a second differential, and a battery pack that serves as an energy reservoir. The motor-generator uses power from the battery pack to propel the vehicle at startup and at low speeds or under acceleration. The ICE may or may not be running at startup. When higher speeds, faster acceleration or more power for charging the batteries is needed the ICE is started by the motor-generator, acting as a starter motor.

When the operator wants the vehicle to slow down the initial travel of the brake pedal engages the motor-generator into generator mode converting much of the forward motion into electrical current flow which is used to recharge the batteries while slowing down the vehicle. In this way the forward momentum regenerates or converts much of the energy used to accelerate the vehicle back into stored electrical energy.

The sole purpose of the brushless alternator is to convert mechanical energy generated by the ICE and convert it into electrical energy which is stored in the battery pack. In addition, by regulating the amount of electrical power generated, the alternator also controls and regulates the transmission of the vehicle by changing the internal resistance of the alternator. The pair of motor generators drive the vehicle in tandem with the ICE. The two roles are not interchangeable. When the two motor generators are in operation, they create an extra 200kw of between them.

The mechanical gearing design of the system allows the mechanical power from the ICE to be split three ways: extra torque, extra rotation speed, and power for an electric generator. A computer program running appropriate actuators controls the systems and directs the power flow from the different engine and the electric motor sources. This power split achieves the benefits of a continuously variable transmission (CVT), except that the torque/speed conversion uses an electric motor rather than a direct mechanical gear train connection. The vehicle cannot operate without the computer, power electronics, battery pack and motor-generators, though in principle it could operate while missing the internal combustion engine.

The transmission contains a planetary gear set that adjusts and blends the amount of torque from the engine and motors as it’s needed. Special couplings and sensors monitor rotation speed of each track and the total torque on the tracks, for feedback to the control computer.

In summary, the HybriDrive system works by the brushless alternator feeding electric power to the battery pack where it is stored, before it is supplied to the two motor generators which rectify the electric energy into mechanical energy, where it is then used to drive the tracks. Furthermore, during normal operation the engine can be operated at or near its ideal speed and torque level for power, economy, or emissions, with the battery pack absorbing or supplying power as appropriate to balance the demand placed by the driver. During stoppages the internal combustion engine can even be turned off for even more economy.

Two other advantages are made possible by this set up.

The first is "Stealth Mode," where the vehicle can travel at slow to medium speeds without using the ICE for power, thus running silently. This gives an assaulting force an enourmous advantage as an enemy will generally not be able to hear the IFV approaching, except over rough ground which would cause noise. However, the absence of an engine note will mean that the noise of the tracks on the ground alone will not alert the enemy to the presence of an IFV. In this mode, the alternator spins freely and the engine is de-coupled from the rest of the drivetrain. Stealth Mode can be run for up to fourty minutes or fifty kilometres running off the battery power. After this, the ICE will need to recharge the battery pack.

The second is the "Overboost" function. When accelerating, the vehicle teams the powerful ICE with the pair of motor-generators to combine their power and torque, resulting in a huge boost to acceleration. The Overboost function can also be employed for the vehicle to act as a tug, by either pushing or pulling an otherwise immobile vehicle, up to an eighty tonne MBT, to a safer position.

The vehicle is able to reach comparitively high speeds for a tracked vehicle by the use of protective rubber covers placed over the steel tracks. Effectively, these covers are essentially odd sized tyres which cannot be inflated. The outside of these rubber tracks are made from dense and durable rubber while the inner of the covering track is made from high-density latex which provides a limited shock absorbtion role, thus greatly reducing the stress placed upon the steel tracks underneath the rubber covering. If this exterior cover is damaged, it can be easily shed from the track and the track can continue on it's way relatively unaffected aside from a much lower maximum speed.


Tl;dr: just read it ffs

DAMMIT MAN
I still need to work out what the engine for my own diesel-electric drive is :(


Just take one of mine. Hell, I've got about eight different hybrid drivetrains drawn up ranging from a 200kw V6 petrol engine right up to a 5000kw diesel locomotive Prime Mover.

PostPosted: Sat Aug 13, 2011 5:14 am
by Australien
Licana wrote:
Australien wrote:Unless I want to horde tanks, that is.

T-55 zerg rush gogogogogo.

Nah, a bit pricey.
I'll just go T-34. :V

PostPosted: Sat Aug 13, 2011 5:18 am
by Licana
Australien wrote:
Licana wrote:T-55 zerg rush gogogogogo.

Nah, a bit pricey.
I'll just go T-34. :V

Image

PostPosted: Sat Aug 13, 2011 5:36 am
by Galla-
T-34-100.

PostPosted: Sat Aug 13, 2011 7:07 am
by Australien
Licana wrote:
Australien wrote:Nah, a bit pricey.
I'll just go T-34. :V

Image

It looks like a tractor....
Perfect!

PostPosted: Sat Aug 13, 2011 7:07 am
by The Anglo-Saxon Empire
Australien wrote:
Licana wrote:It shouldn't be.

Unless I want to horde tanks, that is.

I've said it before and I will say it again, due to the scale of NS and massive military budgets the choice is rarely between hordes of crappy tanks or small numbers of good tanks, it is between a decent number of good tanks and a decent number of crappy tanks.

PostPosted: Sat Aug 13, 2011 7:22 am
by Crookfur
Munathanura wrote:
Crookfur wrote:Munathanura: Darn you and your inconvenient facts ;)

But my thanks to sister RRoan for helping spread the good news of the 40mm CTA church ;)


I'm pretty close to being converted, tbh. One last obstacle stands in the way, and that's the feed system. Both a US army analysis and this Thales presentation have the feed system as linkless. Would it be possible to reload the system in the field, or would it require the vehicle to be back at base?

IIRC most guns of this sort of size use linkless feeds. Feild reloading shouldn;t be an issue. I honestly have no idea how it would achived precisely but the main linkless magazine will have a loading port to allow you insert rounds by hand, using charger clips or a big mechanical charger like they use for laoding the feed systems on aircraft.

PostPosted: Sat Aug 13, 2011 7:28 am
by Munathanura
Crookfur wrote:
Munathanura wrote:
I'm pretty close to being converted, tbh. One last obstacle stands in the way, and that's the feed system. Both a US army analysis and this Thales presentation have the feed system as linkless. Would it be possible to reload the system in the field, or would it require the vehicle to be back at base?


IIRC most guns of this sort of size use linkless feeds. Feild reloading shouldn;t be an issue. I honestly have no idea how it would achived precisely but the main linkless magazine will have a loading port to allow you insert rounds by hand, using charger clips or a big mechanical charger like they use for laoding the feed systems on aircraft.


That's a handy thing to know. It also means that I'm now a convert ;). All hail that 40mm CTA! :p

PostPosted: Sat Aug 13, 2011 8:38 am
by Samozaryadnyastan
Vitaphone Racing wrote:
Samozaryadnyastan wrote:DAMMIT MAN
I still need to work out what the engine for my own diesel-electric drive is :(


Just take one of mine. Hell, I've got about eight different hybrid drivetrains drawn up ranging from a 200kw V6 petrol engine right up to a 5000kw diesel locomotive Prime Mover.

I've already put it on a couple of AFVs, so its self-manufacture unfortunately.

My two thoughts are a 6-cylinder M4+2 copy or an 8-cylinder opposed piston.
Both turbodiesel, power between 1800-2000hp.

PostPosted: Sat Aug 13, 2011 1:22 pm
by Saphirasia
Galla- wrote:T-34-100.

They were actually considering a variant of the T-34-85 that mounted a D-10T.
Unfortunately, you can only do so much with 45mm hull armor...

PostPosted: Sat Aug 13, 2011 2:59 pm
by Senestrum
Australien wrote:
Senestrum wrote:
That might, maybe, get you a new-build stock Leo2A6. Any newer variants or upgrades are going to be well out of that price range (most expensive production Leo variant I'm aware of cost more than twice your limit, lol).

You should strongly consider going used or eastern if you want a tank under 6 million.

I've got nothing against going Eastern, but why would just getting a stock 2A6 be a problem?



There's nothing wrong with it, it's just a 10 year old update of a 30 year old tank and a 2011 new-build would either be right at or a bit above your spending limit.

A thing to keep in mind is that buying a tank with a purchase cost, say, half that of another tank doesn't mean that you can buy twice as many of the cheaper tank. Sure, the procurement cost is the same, but you need to train and support twice as many crew and have a logistics base that is also twice as large and all the extra personnel that implies.

PostPosted: Sat Aug 13, 2011 5:41 pm
by Australien
Senestrum wrote:There's nothing wrong with it, it's just a 10 year old update of a 30 year old tank and a 2011 new-build would either be right at or a bit above your spending limit.

A thing to keep in mind is that buying a tank with a purchase cost, say, half that of another tank doesn't mean that you can buy twice as many of the cheaper tank. Sure, the procurement cost is the same, but you need to train and support twice as many crew and have a logistics base that is also twice as large and all the extra personnel that implies.

I understand that spending less isn't going to allow me to field way more vehicles, I was just trying to impose a realistic limit on my expenses (As my army isn't very tank-focused and I'm planning on spending up on the navy/air force).
I just really don't know much about tanks, and what is available.


The Anglo-Saxon Empire wrote:I've said it before and I will say it again, due to the scale of NS and massive military budgets the choice is rarely between hordes of crappy tanks or small numbers of good tanks, it is between a decent number of good tanks and a decent number of crappy tanks.

I was making a joke. :)

PostPosted: Sat Aug 13, 2011 6:09 pm
by Lamoni
United States of PA wrote:*Knows someone who can show him how to make TNT in his kitchen*

EDIT: And truth be told, not entirely sure it is illegal too.


I can do that too.

PostPosted: Sun Aug 14, 2011 1:56 am
by The Narexian Socialist States
Senestrum wrote:
rar big post responding to stuff in the last few pages

Licana wrote:Plasma...tank...in atmosphere...lawl.


Only realistic plasma tank gun: Hellbore.

Bolos fuckyeah.

The Anglo-Saxon Empire wrote:Does,'t look like a tank gun.

Also, what is the penetration of a roankep?


1400mm RHAe, going by ye olde perforation equation.

Said equation is based on tests conducted with older tungsten alloys which are inferior to the specific materials (well, the material is pretty much the same, it's the alloying process that's different) being used in roankep, discounts the penetrating cap harder than any ceramic armor it will ever face, etc. So, since I cannot accurately quantify it, I will simply state 1400mm+ RHAe rather than any exact figure.

The Anglo-Saxon Empire wrote:Anyway, I am coming up with a HEAT equivalent to the RoanKEP, Super HEAT, pretty much it is a regular HEAT that uses molybdenum in place of copper and has 3 charges, a precursor, a main charge, and a followup charge (due to the speed a shape charge travels I only need to delay the charges going off by about 0.001 seconds to keep them from disrupting each other). I estimate almost three meters penetration with the absence of ERA.

140mm Super HEAT

70mm Molybdenum Cone +700mm
135mm Moltbdenum Cone +1350mm
70mm Molybdenum Cone +700mm

Total Penetration: 2750mm RHAe


Use a DU cone for the followup charge, and use a heavier cone optimized for epic behind-armor effect instead of one optimized for penetration. It's what the rear charge is for, after all. You also probably won't be getting optimum P/Cd ratios with a triple-tandem weapon.

The Anglo-Saxon Empire wrote:You are FT right? Why is this even a question, use anti-matter KEPs, an arrow like penetrator with a hollowed out vacuum with some anti-matter suspended in the core. When you hit a target the shell cracks, air floods into the vacuum and the anti-matter explodes. Or just use lulzy long KEPs since you don't have to worry about propellant and fire them from rail guns. Also short of unobtanium you can use almost anything and oneshot any FT tank since the scale slides so far in favor of the weapons instead of the armour.


Use vehicle-mounted nucleosynthesis plants to generate superlong Dubnium-268 penetrators at the company level, which would be distributed to their tank unit (ammunition would be recycled within a few hours, since the low half-life would presumably degrade the material quality as the Dubnium decays). Twice as dense as anything IRL? FUCK YEAH. Fire out of totally jawesometastic railguns/coilguns at unnecessarily high speeds for hilarious APFSDS action.


Munathanura wrote:
According to Tony Williams, the 50mm SS and the 40mm CTAS have roughly the same penetration and propellant weight. He also suggests that the 50mm SS should have slightly better ballistic potential and, going by the list of explosive weights, I'd say that the 50mm SS has the potential for a heavier HE projectile.

I'm thinking of using the 20mm coax so that it could take out both infantry and vehicles too lightly armoured to justify using the main cannon, given that it only has 230 rounds total. You think that a GPMG would be better, though?


The 40mm CTA gun is just ridiculously small though.

Image

The two top guns are bushmasters, don't know what the big 40 is.

No that cannon aint big enough or bulky enough to be a bofors 40mm. Plus it just doesn't have that charasteristic Bofors muzzle booster on it.

PostPosted: Sun Aug 14, 2011 2:27 am
by Greater Kaliningrad (Ancient)
We have 500 T-62s,200 T-72s,and 50 T-80s.

PostPosted: Sun Aug 14, 2011 4:47 am
by Vitaphone Racing
Samozaryadnyastan wrote:
Vitaphone Racing wrote:
Just take one of mine. Hell, I've got about eight different hybrid drivetrains drawn up ranging from a 200kw V6 petrol engine right up to a 5000kw diesel locomotive Prime Mover.

I've already put it on a couple of AFVs, so its self-manufacture unfortunately.

My two thoughts are a 6-cylinder M4+2 copy or an 8-cylinder opposed piston.
Both turbodiesel, power between 1800-2000hp.


For a 2000hp engine, you'd need a fair displacement so you'd probably be best looking at twelve cylinders. The M4+2 design is quite tricky, I wouldn't recommend it unless you really look into it.

I've never liked opposed pistons, but I did use one for MG's and my 4000kw freight locomotive. Search LR550 on the GE&T forums and you can see the design if you want.

PostPosted: Sun Aug 14, 2011 4:49 am
by Vitaphone Racing
Lamoni wrote:
United States of PA wrote:*Knows someone who can show him how to make TNT in his kitchen*

EDIT: And truth be told, not entirely sure it is illegal too.


I can do that too.


There was a guy caught trying to split atoms in his kitchen.

You can do some really incredible stuff in your kitchen. And I'm talking more than just a phenomenal sandwich.

PostPosted: Sun Aug 14, 2011 6:10 am
by Capitalist Penguins (Ancient)
Image
Image

We use light and main battle tanks and we have a couple of heavy tanks for use against heavy defenses. Specifically, we use the Merkava and the Stingray Light Tank.

PostPosted: Sun Aug 14, 2011 6:30 am
by Munathanura
Capitalist Penguins wrote:(Image)
(Image)

We use light and main battle tanks and we have a couple of heavy tanks for use against heavy defenses. Specifically, we use the Merkava and the Stingray Light Tank.


What do you use as your heavy tank?