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Sturgeon's House
  1. Collimatrix

    Collimatrix

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    LoooSeR

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    • By SirFlamenco
      Hi everyone, first post here 
       
      I stumbled across this video : 
       
       
       
      It’s super dense polyethylene with a neutral buoyancy core for impact resistance. It weights only 4 pounds, so for weight effiency it’s around 3 times better than ar550 and 4 times better than other ceramics ballistic plates, AND that’s while including the water, which I doubt add any bulletproof capabilities. 
       
      Is it just me or does it sound a bit fishy?
    • By Collimatrix
      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 I 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.
    • By Toxn
      The Joburg war museum (now Ditsong museum of military history) is a bit of an odd beast. Located right next to the Joburg Zoo, it's sort of small and kind of schizo in terms of content. It's also partly a monument to the fallen, partly a conference/events venue and partly a warehouse for all the odds and ends that the country has collected over the years and isn't sure what to do with.
       
      Anyway, I went there recently with my son and brought back tonnes of photos. These will be dumped around the forum in the appropriate places (tanks, planes, big guns and small arms), with this thread serving as an overview.
       

      The entrance is like the rest of the place: tucked away a bit and kind of pokey.
       

      A few metres away, though, is an impressive monument to the British dead from the second Boer war. Nothing screams 'empire' like crushing your enemies and then putting up a huge shrine to your own war dead in their former city.
       


      The museum is divided into a few big halls, some narrow glass-fronted galleries, an open park area and a central conference venue. One thing which should be noted is that two of the galleries do not allow photography.  The interior pictures from these halls posted below are merely accurate replicas made from memory and a bunch of 1:72 models I happened to have lying around.
       


       
      Brink Hall from the front and back. It has a number of aircraft and related gear, as well as stuff related to the Boer war and First World War. The Brink Hall is pretty much the first thing you're going to wander into, as its close to the entrance.
       

       
      Between the two halls is a little artillery display. From here you can either go right to the open park area or straight into the Adler Hall.
       





      The Adler Hall from a few angles. This one is dedicated to small arms, uniforms, a POW exhibit and just about everything else you can cram into a small hall and still fit. It also has a few vehicles (M3 light, Sexton, M4) that are opened up and/or have stairs so that you can look into them.
       

      Past the uniform exhibit (which snakes around the sides and back of the hall) is a rather random exhibit on Cuito and the Border war. The cut-up Ratel in there has a driver's station with a display above it. The display shows grainy footage from the battle on a loop.
       


      Just past the artillery display thingy there are a few naval objects on display. The most interesting is probably this Nazi mini-sub which we got from who-knows-where. The placement of the sub did something strange to my phone camera, so there are no photos with it in perfectly focus.
       

      Most of the outdoor park stuff is going into other posts, so I'm just putting this there. These are the only two things that kids are allowed to clamber all over in the museum, and the little tykes seem to have stripped them down to bare metal over the years in doing so. I actually have lots of photos of these, as my little one was very insistent on spending time driving the jeep/flying the plane.
       
      All in all: a decent little museum, and home to a few interesting odds and ends that I'll put up in other places.
       
      Edit:
      Part 2
      Part 3
      Part 4
      Part 5
      Part 6
       
       
       
    • By Toxn
      Part 6 of a multi-part series.
       

      Some kind of goofy mutant and an America-mobile.
       

      A duck and a ferret.
       

      Saracen
       


      Ratel 20.
       

      Eland 90, aka the Noddy car.
       

      Eland 60, sans 60mm mortar.
       


      Crazypants Italian armoured car. I honestly have no idea which end is the front and which end is the back.
       


      Granddaddy armoured car.
       

      Our first attempt at a locally-made armoured car. This is where we caught the wheeled death trap bug.
       


      Attempt the second. The Boys anti-tank rifle is missing.
       



      Attempt the third. The Brits had finally gotten tired of the 2 pounder, so of course we snapped them up and stuck them into our wheeled death traps.
       



      Attempt 4. Now we're really getting into it. I think that that's a 6-pounder, but I could be wrong.
       

      The G6. This is what happens if you let us work on the same thing for too long. Eventually you end up with a house-sized monster armed with a howitzer.
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