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Monochromelody

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Everything posted by Monochromelody

  1. The Al Khalid derived from Norinco Type 90IIM MBT. It was in the early 90s, when India started to test their Arjun MBT. Pakistanis looked for a MBT design that could be produced by herself. Norinco provided their own Type 90IIM prototype, this is an MBT design which comprised many Western components, such as engine and transmission. There were 4 prototypes for Al-Khalid development, namely P1, P2, P3 and P4. P1 has a Chinese tank diesel engine with ZF LSG3000 transmission. P2 has a British Perkins CV12 Condor diesel engine with French SESM ESM500 transmission. P3 has a
  2. Disappeared for a long period, Mai_Waffentrager reappeared four months ago. This time, he took out another photoshoped artifact. He claimed that the Japanese prototype 105GSR (105 mm Gun Soft Recoil) used an autoloader similar to Swedish UDES 19 project. Then he showed this pic and said it came from a Japanese patent file. Well, things turn out that it cames from Bofors AG's own patent, with all markings and numbers wiped out. original file→https://patents.google.com/patent/GB1565069A/en?q=top+mounted+gun&assignee=bofors&oq=top+mounted+gun+bofors
  3. Jagdpanzer 38(t) Hetzer, is a famous late-war Jagdpanzer. On the very early version of Hetzer, it did got a muzzle brake, but such device was removed on later models. After war, Switzerland bought some Hetzer from Czechslovakia, named as G-13. Muzzle brake became standardise on G-13. But, have you ever seen a Hetzer with a muzzle brake like this? (below) Some source like Tanks-Encyclopedia describe this as "early production Hetzer with muzzle brake" but I really can't tell which German KwK or PaK have such British style muzzle brake, like those on Cromwell
  4. https://tieba.baidu.com/p/2377512442 Do you guys know Sherman M60? It's an Israeli-Chilean upgrade version, equipped with an OTO-IMI 60mm High Velocity Medium Support gun, or HVMS 60. This gun is capable for firing APFSDS and could penetrate 120mm/60° RHA at 2000m. Chilean Army also used these powerful guns to upgrade their M24s and M41s.
  5. Nicholas Noran a.k.a. "Chieftain" mentioned about this in his program "Chieftain's hatch", but it was a mistake. The ИС-4s use a ЗК-steering mechanism, named after its designer. Г. И. Зайчик(1905-1977) М. К. Кристи(1890-1965) According to the ИС-4 heavy tank operator's manual(Руководство по эксплоатации тяжёлого танка ИС-4), published by Soviet Red Army in 1949, the tank could pivot on one track when in neutral position. Pivot on spot is different from pivot on one track. R=B/2 is pivot on spot, R=B is pivot on one track. Some historical do
  6. The US CD-850 is another instance for triple differential steering system. On the British Merritt-Brown, when the vehicle goes forward, the sun wheel and ring gear of the planetary always counter rotate. On CD-850, when the vehicle goes forward, the sun wheel and ring gear rotate toward the same direction. The neutral steering of CD-850 is similar to the Merritt-Brown system.
  7. Another approach to neutral steering is the triple differential steering system. Henry Edward Merritt, an engineer and gearbox designer, is famous for his unique invention, Merritt triple differential transmission. The first British mass production tank with triple differential transmission is the Churchill tank. The Churchill tanks have a Merritt-Brown H4 gearbox, 4 stands for four gears forward, H stands for horizontal, because the two rows of gears in the gearbox are horizontally located. A great advantage of Merritt's design is compactness. The transmission incorpora
  8. T-14 Armata uses double differential steering systems and is able to neutral steer. Some Russian prototype MBTs can also perform neutral steer, like T-80UM-1 Bars and T-80UM-2 Black Eagle. The first Russian tank with neutral steering is Object 770 experimental heavy tank.
  9. Yes, Soviet tanks started to have dual-flow transmission after WWII, like Объект 770 heavy tank, Объект 906 amphibious tank and so on. The МТ-ЛБ transmission is similar to АТ-Л artillery tractor's transmission, which is also dual-flow transmission.
  10. The neutral steer, or pivot steer, means the tank drive one track forward while the other track backward, to perform a turn-on-spot. The very first tank with neutral steer, believe it or not, is the German A7V in WWI. Here is the transmission of A7V. The transmission incorporate two independent gearbox, each connected to a 100-hp engine. The gearbox use clash gears to select speed, and bevel gear to select forward or reverse. It's easy to perform a neutral steer. Those tanks with electric transmission(St.Chamond, Porsche Tiger, etc.) can easily perform
  11. Sad to find out there is little information about AMX M-4's ZF transmission. ZF's official website mentioned that they converted a Entwicklung-Series tank transmission to meet French 1000-hp AMX M-4 tank design. This ZF-type transmission was widely used among early post war French heavy tank programs.
  12. From a Japanese magazine PANZER screenshot, it says: This is a Type 61 tank with a sort of ad-hoc spaced armour, using for target practice in exercise. The armour plates surrounding the turret and side skirts make it looks like a WW2 German Panzer IV. The crew tried to pull out a practice round stucking in the side skirt, this round was fired from a recoilless rifle. According to the vegetation of the exercise range, the vehicle was painted in a 4-colour camouflage.
  13. I've heard that this Type 61 tank with appliqué spaced armour was used for anti-tank rifle grenade firing practice.
  14. Could you please tell some detail about the development of AMX 10 series AFV? Thank you.
  15. According to Rolf Hilmes' KPz Leopard 1 1956-2003, p.43, In year 1983, the Bundeswehr send two Leopard 1 tanks for 120 mm cannon conversion: one Leopard 1 A5 with cast turret, one Leopard 1 A3 with welded turret. And in Tankograd No.5014, p.30, The conversion of normal Leopard 1 A5 also included the preparation for installation of a 120mm smoothbore cannon, though never realised in production models.
  16. Leopard 1 A5 with 120 mm smoothbore cannon
  17. According to the gear train schematic, AMX 10RC have a triple-differential steering mechanism. This is more common on British after-war period armoured vehicle but quite rare on a French AFV. It differs from a Merritt-Brown gearbox, for the ring gear and sun gear of the steering planetary both driven in the same direction. Designed in the 1970s, the transmission of AMX 10RC shares some similarity with the TN15 gearbox of Alvis Scorpion light tank(FV101). Both of them combine the forward-reverse selector with the input bevel gears. The gear shifting part use a set of constant
  18. Thanks a lot! It appears to be a triple-differential steering system.
  19. Yes, Chieftain tank has a single steering radius for every gear, while Leopard 1 would have two steering radius for every gear, 4×2=8. And Ariete tank have 4×3=12 steering radius in total. The British prefer triple differential system for it's easier to produce and maintain, and a braking drum could probably be cheaper than a multidisc clutch.
  20. As far as I know, double-differential system split and transfer steering power flow by engaging different clutch(direction clutch, sometimes radius clutch), or brake certain steering planetary gear, or simply by a hydraulic pump-motor unit. Triple-differential system split steering power flow by braking either side steering planetary gear(usually sun gear), transfer steering power flow to the other side via a differential. It's much easier for a double-differential system to achieve different steering radius. For example, Single radius: Somua steering system(Somua S35)
  21. As we know, AMX 10 RC is a very special wheeled AFV for it's skid steering system. It can perform neutral steer, a.k.a. pivot steer or steer in place. The transmission case is similar to some tank transmission. The driver uses steering levers instead of a steerig wheel, and it's almost identical with those on AMX 10P tracked AFV. ↑wheeled AMX 10 RC ↓tracked AMX 10 P It even had a variant running on tracks: As for steering principle, there are different descriptions. Some info says AMX 10 R
  22. 各位最近可能在WT论坛上见过这张图片,在一些争论陆上自卫队90式战车的讨论串里: Some of you may have seen this pic recently on WT forum, in some thread arguing the protection of JGSDF Type 90: Discussion on WT forum 我就直说吧,表格里的中文注解说了,这不过是个“猜想”,GUESSING。 To be straight, the Chinese annotation in the table said it is just a GUESSING. 注解内容可能完全是编造的,但不幸的是,不同语言间的障碍使你们无法看穿这点。 This annotation could be totally nonsense but unfortunately a barrier between languages prevent you guys see throught it. 实际上,这又是一份关于陆上自卫队10式战车的文件,说的并不是90式。 In fact, again, this document itself is abo
  23. Share some less-known information about cold war period tracked vehicle transmission Mithubishi transmission MT75 for STB, later known as Type 74. The basic layout of MT75 is similar to the CD-500 transmission on M41 light tank, used by JGSDF in a short period after war. But the Japanese tank designers prefer mechanical gearbox rather than hydramatic gearbox, they use a electro-mechanic high-low range instead of a torque converter. The high-low range part is described as "1次変速"(range first stage). The steering mechanism is a single-radius, double differenti
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