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Found 11 results

  1. Collimatrix

    Bash the EM-2 Thread

    Here at Sturgeon's House, we do not shy from the wholesale slaughter of sacred cows. That is, of course, provided that they deserve to be slaughtered. The discipline of Military Science has, perhaps unavoidably, created a number of "paper tigers," weapons that are theoretically attractive, but really fail to work in reality. War is a dangerous sort of activity, so most of the discussion of it must, perforce, remain theoretical. Theory and reality will at some point inevitably diverge, and this creates some heartaches for some people. Terminal, in some cases, such as all those American bomber crews who could never complete a tour of duty over Fortress Europe because the pre-war planners had been completely convinced that the defensive armament of the bombers would be sufficient to see them through. In other cases though, the paper tiger is created post-facto, through the repetition of sloppy research without consulting the primary documents. One of the best examples of a paper tiger is the Tiger tank, a design which you would think was nearly invincible in combat from reading the modern hype of it, but in fact could be fairly easily seen off by 75mm armed Shermans, and occasionally killed by scout vehicles. Add to this chronic, never-solved reliability problems, outrageous production costs, and absurd maintenance demands (ten hours to change a single road wheel?), and you have a tank that really just wasn't very good. And so it is time to set the record straight on another historical design whose legend has outgrown its actual merit, the British EM-2: EM-2ology is a sadly under-developed field of study for gun nerds. There is no authoritative book on the history and design of this rifle. Yes, I am aware of the Collector's Grade book on the subject. I've actually read it and it isn't very good. It isn't very long, and it is quite poorly edited, among other sins devoting several pages to reproducing J.B.S. Haldane's essay On Being the Right Size in full. Why?!!?!! On top of that, there's quite a bit of misinformation that gets repeated as gospel. Hopefully, this thread can serve as a collection point for proper scholarship on this interesting, but bad design. Question One: Why do you say that the EM-2 was bad? Is it because you're an American, and you love trashing everything that comes out of Airstrip One? Why won't America love us? We gave you your language! PLEASE LOVE ME! I AM SO LONELY NOW THAT IT TOLD THE ENTIRE REST OF EUROPE TO FUCK OFF. Answer: I'm saying the EM-2 was a bad design because it was a bad design. Same as British tanks, really. You lot design decent airplanes, but please leave the tanks, rifles and dentistry to the global superpower across the pond that owns you body and soul. Oh, and leave cars to the Japanese. To be honest, Americans can't do those right either. No, I'm not going to launch into some stupid tirade about how all bullpup assault rifle designs are inherently a poor idea. I would agree with the statement that all such designs have so far been poorly executed, but frankly, very few assault rifles that aren't the AR-15 or AK are worth a damn, so that's hardly surprising. In fact, the length savings that a bullpup design provides are very attractive provided that the designer takes the ergonomic challenges into consideration (and this the EM-2 designers did, with some unique solutions). Actually, there were two problems with the EM-2, and neither had anything to do with being a bullpup. The first problem is that it didn't fucking work, and the second problem is that there was absolutely no way the EM-2 could have been mass-produced without completely re-thinking the design. See this test record for exhaustive documentation of the fact that the EM-2 did not work. Points of note: -In less than ten thousand rounds the headspace of two of the EM-2s increased by .009 and .012 inches. That is an order of magnitude larger than what is usually considered safe tolerances for headspace. -The EM-2 was less reliable than an M1 Garand. Note that, contrary to popular assertion, the EM-2 was not particularly reliable in dust. It was just less unreliable in dust than the other two designs, and that all three were less reliable than an M1 Garand. -The EM-2 was shockingly inaccurate with the ammunition provided and shot 14 MOA at 100 yards. Seriously, look it up, that's what the test says. There are clapped-out AKs buried for years in the Laotian jungle that shoot better than that. -The EM-2 had more parts breakages than any other rifle tested. -The EM-2 had more parts than any other rifle tested. -The fact that the EM-2 had a high bolt carrier velocity and problems with light primer strikes in full auto suggests it was suffering from bolt carrier bounce. As for the gun being completely un-suited to mass production, watch this video: Question Two: But the EM-2 could have been developed into a good weapon system if the meanie-head Yanks hadn't insisted on the 7.62x51mm cartridge, which was too large and powerful for the EM-2 to handle! Anyone who repeats this one is ignorant of how bolt thrust works, and has done zero research on the EM-2. In other words, anyone who says this is stupid and should feel bad for being stupid. The maximum force exerted on the bolt of a firearm is the peak pressure multiplied by the interior area of the cartridge case. You know, like you'd expect given the dimensional identities of force, area and pressure, if you were the sort of person who could do basic dimensional analysis, i.e. not a stupid one. Later version of the British 7mm cartridge had the same case head diameter as the 7.62x51mm NATO, so converting the design to fire the larger ammunition was not only possible but was actually done. In fact, most the EM-2s made were in 7.62x51mm. It was even possible to chamber the EM-2 in .30-06. I'm not going to say that this was because the basic action was strong enough to handle the 7x43mm, and therefore also strong enough to handle the 7.62x51mm NATO, because the headspace problems encountered in the 1950 test show that it really wasn't up to snuff with the weaker ammunition. But I think it's fair to say that the EM-2 was roughly equally as capable of bashing itself to pieces in 7mm, 7.62 NATO or .30-06 flavor. Question Three: You're being mean and intentionally provocative. Didn't you say that there were some good things about the design? I did imply that there were some good aspects of the design, but I was lying. Actually, there's only one good idea in the entire design. But it's a really good idea, and I'm actually surprised that nobody has copied it. If you look at the patent, you can see that the magazine catch is extremely complicated. However, per the US Army test report the magazine and magazine catch design were robust and reliable. What makes the EM-2 special is how the bolt behaves during a reload. Like many rifles, the EM-2 has a tab on the magazine follower that pushes up the bolt catch in the receiver. This locks the bolt open after the last shot, which helps to inform the soldier that the rifle is empty. This part is nothing special; AR-15s, SKSs, FALs and many other rifles do this. What is special is what happens when a fresh magazine is inserted. There is an additional lever in each magazine that is pushed by the magazine follower when the follower is in the top position of the magazine. This lever will trip the bolt catch of the rifle provided that the follower is not in the top position; i.e. if the magazine has any ammunition in it. This means that the reload drill for an EM-2 is to fire the rifle until it is empty and the bolt locks back, then pull out the empty magazine, and put in a fresh one. That's it; no fussing with the charging handle, no hitting a bolt release. When the first magazine runs empty the bolt gets locked open, and as soon as a loaded one is inserted the bolt closes itself again. This is a very good solution to the problem of fast reloads in a bullpup (or any other firearm). It's so clever that I'm actually surprised that nobody has copied it. Question Four: But what about the intermediate cartridge the EM-2 fired? Doesn't that represent a lost opportunity vis a vis the too powerful 7.62 NATO? Sort of, but not really. The 7mm ammunition the EM-2 fired went through several iterations, becoming increasingly powerful. The earliest versions of the 7mm ammunition had similar ballistics to Soviet 7.62x39mm, while the last versions were only a hair less powerful than 7.62x51mm NATO. As for the 7mm ammunition having some optimum balance between weight, recoil and trajectory, I'm skeptical. The bullets the 7mm cartridges used were not particularly aerodynamic, so while they enjoyed good sectional density and (in the earlier stages) moderate recoil, it's not like they were getting everything they could have out of the design. note the flat base In addition, the .280 ammunition was miserably inaccurate. Check the US rifle tests; the .280 chambered proto-FAL couldn't hit anything either.
  2. Walter_Sobchak

    The Chieftain MBT

    I realized that we don't actually have a thread about the British Chieftain tank. I posted a bunch of Chieftain related stuff on my site today for anyone who is interested. The items include: Magazine Articles 1970 article from ARMOR 1970 article from IDR - Chieftain-Main Battle tank for the 1970s 1976 article from IDR - The Combat-Improved Chieftain – First Impressions 1976 article from IDR - Improved Chieftain for Iran Government reports WO 194-495 Assessment of Weapon System in Chieftain WO 341-108 Automotive Branch Report on Chieftain Modifications DEFE 15-1183 – L11 Brochure WO 194-463 – Demonstration of Chieftain Gun WO 194-1323 – Feasibility study on Burlington Chieftain
  3. When I read a book in Chinese ''坦克技术概论'',I found a pic showed below, it looks like a T-72s autoloader,but actually it was mounted on British tank,maybe the Centurion.I try to search for the source but I failed. Is there anyone have more information about it?
  4. Walter_Sobchak

    Separated at Birth

    Bundeswehr Weasel and British Light tank Mark IV
  5. Follow onpost about the 40mm CT ammo, one of the vehicles that will supposedly be using it is the new tracked scout SV vehicle. http://www.janes.com/article/53167/scout-sv-to-be-assembled-in-uk Now to be assembled in the UK as opposed to Spain. Neat looking scout vehicle.
  6. So, two days ago on Status Report it was mentioned that the top speed of the Action X Centurion was historical, that it was based on the South African Olifant (no relation to that BabyOlifant fellow from the WoT forums): Naturally, this made me curious and so I started digging into the history of the Olifant and the upgrades South Africa made to their Centurions. Project Skokiaan began in 1972, with the goal being to replace the always unreliable 650hp Meteor engine. The replacement was the 810hp V-12 AV-1790 gasoline engine, which had seen service in the early variants of the M48 Patton, which was coupled to a new three speeed automatic transmission. In 1974, Project Semel was undertaken to further improve both the engine and tranmission, and it was under Project Semel that the Centurion reached a power to weight ratio of 16.5 hp/ton and a top speed of 50km/h, up from the 35km/h it got with the 650hp Meteor engine, and effectively doubling the vehicle's range. Now here's where it gets interesting. Under Project Olifant in 1976, the engine was replaced with a 750hp V-12 AVDS-1790 (used on the M60, and Israeli Centurions and M48s) and possibly a new transmission, which lowered the power to weight ratio to 13.4hp ton, and the top speed down to 45km/h, however the range further increased due to the diesel engine and fuel efficiency. With some other improvements, this became the Olifant Mk. 1 Near as I can tell, it took the Olifant Mk. 1A to finally replace the 20-pdr with the 105mm L7, but it's the Mk. 1B that's interesting. The engine on the Mk. 1B was repalced again with a 900hp engine, but apparently this was later superceded by a V12 950hp engine, possibly an American engine by way of Israel. In addition, the entire suspension was comprehensively rebuilt with individual torsion bars for the roadwheels rather than the outdated Horstmann suspension. So having researched all of that, I went back and looked at the engines of the Centurion Mk. I and Centurion Mk. 7/1 in-game, of which the elite form of the Centurion Mk. I is the Centurion Mk. III, and the elite form of the Centurion Mk. 7/1 is the Mk. 9. The Centurion 1 starts out with a 600hp Rolls-Royce Meteor engine, upgrades to a 650hp Rolls-Royce Meteor engine, which near as I can tell pretty much all of the Centurions in British service used for the entirety of their service, and finally as an elite engine it gets a 750hp Meteor engine that may or may not have existed, and certainly wasn't mounted on any mark of Centurion even close to a Centurion Mk. III, which with its historical 650hp engine, went a whopping 35km/h. In-game however, the top speed of the Centurion Mk. I is 40km/h, The Centurion 7/1 on the other hand, starts out with the 650hp Meteor engine, gets the aforementioned (and possibly fictional) 750hp version, and then gets a 950hp Rolls-Royce Griffon engine, that I can only find a single source as to ever being fitted to a Centurion. What's incredible however, is that the top speed of the Centurion 7/1 in-game is still 40km/h, even though the South Africans managed to get 50km/h with the 810hp AV-1790, and 45km/h with the 750hp AVDS-1790 and a lower power to weight ratio. However, it doesn't end there, as I came across something very interesting along the way. Namely that the Olifant Mk. 2 has a 1040hp diesel engine, also possibly of US origins via Israel. I even found an article from 2005 detailing that BAE had won the contract to upgrade more of the Olifant Mk. IBs to Mk. 2 standard, which includes 1040hp engine. So having found this, I decided to go back and look at the stats for the Action X Centurion on Status Report and something jumped out at me: Makes you wonder just what was meant by that statement regarding the Action X and Olifant, huh? Sources: http://www.secretprojects.co.uk/forum/index.php?topic=9088.235 http://www.secretprojects.co.uk/forum/index.php/topic,9088.240.html http://www.pmulcahy.com/tanks/south_african_tanks.html Anyway, I figured this could be a thread for instances like this, effort posts detailing just what Wargaming got wrong or might be fucking up in some way, either knowingly (as I believe to be the case here with the Action X being given some South African upgrades to make it competitive), or ignorantly, because they couldn't be bothered to do basic research. Hell, maybe I should try sending this into Status Report, get my name in all the papers or some shit.
  7. Oh my! Cased telescoped Cannon Ammo. These are for the Warrior upgrade program and their recce replacement vehicle program. http://www.janes.com/article/52685/uk-orders-ctas-40-mm-cannons-for-new-armoured-vehicles
  8. During the Korean War, some Cromwells were captured from the British by the CCA during fighting around Seoul in January of 1951. These Cromwells where given to the KPA and fought against the Brits who now had Centurions. This instance occured during the so-called Happy Valley Battle. "February 11, 1951, two British Centurion heavy tanks commanded by Captain Strachan and First Lieutenant Redford found an unidentified tank hiding under the right side of Han-river railroad bridge while supporting the U.S. reconnaissance company. The commanders order to engage and destroy the unknown tank. The AP shots shot through the side armor and destroyed it. Interestingly, when commanders checked the destroyed tank, they realized it was a British Cromwell tank. It was Centurion tanks "Cuaghoo" from 3rd squadron that destroyed the tank." North Korean operated Cromwell. Centurion supposedly firing at the captured Cromwells. From some Korean Guy's Blog I ran across. Does not seem to be related in any form to the insanity that is Daigensui.
  9. Originally posted by Rossmum on SA; Looks pretty good for the time.
  10. EnsignExpendable

    Moving the Independent

    I just came across this video, where the British Independent tank is moved for an exhibition. Man, that suspension is in terrible shape. Track links have seized up, the springs have seized up, and that horrible groaning sound when it moves is indicative of some bigger problems. Yuri Pasholok & Co. complained that the T-35 that moved under its own power was in horrible condition, but this thing is just a whole new ball game.