• SSTF@lemmy.world
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    3 months ago

    Nonshitpost comment: A video I like to recommend on tank production illustrates the differences in mindset for industrial production.

    Summary is that the US had mastered assembly line production and the use of subassembly parts to minimize production time. The US military had a centralized body to evaluate and approve different variants, which meant production stayed smooth.

    The Soviets lacked experience with this kind of mass production by they quickly caught on and adapted in a logical way. They used assembly line production, but didn’t use subassemblies from different factories, as that would clog up their rail lines and spread out the factories needed to be defended. Instead they centralized so that trains brought raw materials to factories and left with finished tanks.

    The Germans built tanks with a team of people who would continually work on one tank, crafting it. This was much slower. There was also too much of a direct line between many different military commanders and the tank production, allowing commanders to constantly put in their own personal special requests, further slowing down production as so many tanks had to have special modifications (that weren’t important to the big picture).

    • grue@lemmy.world
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      3 months ago

      I’ve seen (what I think is) a different video that made a similar point. I wish I could remember it well enough to find it again.

  • Maggoty@lemmy.world
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    3 months ago

    This is missing a picture of an American shipyard and an ice cream barge. The Japanese really didn’t have a hope of winning. We were adding multiple aircraft carriers per year to the fleet, and more each year than the last. So they’d sink one and it would be replaced by 3 more.

    • EpeeGnome@lemm.ee
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      3 months ago

      an ice cream barge

      For those not familiar, the WW2 US Pacific fleet included, no joke, a barge originally built to deliver and mix massive amounts of concrete that was refitted with food grade surfaces and a huge cooling system to supply ice cream throughout the fleet. I mean, it was navy “ice cream” from powder, but it was still a luxury that boosted morale wherever it went. I can only imagine how much it would have hurt Japanese morale if they had found out the US had so much resources to spare that they could waste them on industrial quantities of frozen treats.

      • skulblaka@sh.itjust.works
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        2 months ago

        Also remember that this was during Prohibition when ice cream was the stand in for booze for most Americans.

        Basically the Navy was rowing around a battalion-sized keg party across the Atlantic

        Also, one of my favorite American history facts, after a chain of several events this is also why we still have about a billion pounds of cheese squirreled away in caves under most of the Midwest. Not kidding. The ice cream boom caused problems for the milk industry after Prohibition was repealed and one two skip a few, we’ve got 19.5 fucktons of government subsidized cheese and nowhere to put it. This is a true story. Once society inevitably collapses in the West I’m headed toward the cheese caves.

        • EpeeGnome@lemm.ee
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          2 months ago

          WW2 started several years after America ended the Prohibition, and the ice cream barge was commissioned in its later years as the war in the Pacific dragged on. Still, I don’t think the navy was providing alcohol rations, so I imagine it was quite the party atmosphere when the ice cream barge showed up.

          • skulblaka@sh.itjust.works
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            2 months ago

            Oof, guess my timing was a little off, fair enough. But by this point these were soldiers who grew up with ice cream being the norm.

      • CanadaPlus@lemmy.sdf.org
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        3 months ago

        Hmm. I’m guessing they had problems with getting enough propulsion going? The modern approach would involve some very synchronized stages, but WWII tech would make that difficult.

        Otherwise, this would be a pretty cheap way of doing the Blitz.

          • CanadaPlus@lemmy.sdf.org
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            2 months ago

            Yeah. Now it’d be easy to programmably trigger each charge on the order of microseconds or less, and we can make some pretty fast-shutting valves. Barrel wear is harder and would probably involve simulational fluid dynamics. More likely we’d just build a coilgun, which removes that issue very nicely, and uses similar control electronics.

            Of course, if you want to destroy a city there’s also nukes now, and anything else tends to either move or be very well protected. People have talked about this for space travel, but the trade-off between G-forces and length hurts at least as much as the rocket equation (despite being “only” quadratic instead of exponential).

        • sugar_in_your_tea@sh.itjust.works
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          2 months ago

          Wouldn’t the modern approach largely use synchronized magnets? I suppose you could synchronize explosive charges, but that seems way more complicated than a rail gun.

          • CanadaPlus@lemmy.sdf.org
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            2 months ago

            Quite possibly. Synchronised coils are still a kind of stage, though.

            The downside of that approach is that you have to deliver a lot of electricity quickly. I’d still try it first, just because of the difficulties around protecting the barrel, and the much reduced moving parts count. I should also mention light gas guns, which mostly work like a normal non-staged gun but can get low-hypersonic muzzle velocities just by virtue of how quickly hydrogen or helium can expand.

            • sugar_in_your_tea@sh.itjust.works
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              2 months ago

              It’s a lot easier to produce large amounts of electricity than explosives IMO, especially in war-time when your supply lines are all messed up. As long as you have batteries/capacitors available for your weaponry, you can get creative on how you charge them.

              • CanadaPlus@lemmy.sdf.org
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                2 months ago

                Yeah, but we’re not talking about lighting or space heating here. You need all that energy at once in a split second. Vacuum flywheels or superconducting loops are the usual go-tos for powering coilguns IIRC. The power electronics and switches (as opposed to the control electronics) also need to be able to handle significant current while still being fast.

                If it was that easy, normal stationary guns would be electrical, rather than using a primary and secondary explosive charge in precision-machined disposable casings.

                • sugar_in_your_tea@sh.itjust.works
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                  2 months ago

                  Right, it’s not easy, but it’s generally a one-time cost, especially if it’s going to be in a well-defended area (e.g. the electrical bits would largely be underground to protect from bombs and help w/ heat control). So once you build the infra, you just need to be able to recharge it, and it’s pretty easy to create electricity even if your supply lines are cut off (burn whatever you have).

                  It certainly wouldn’t be practical for a mobile battery, but for something like this that just sits on a hillside, I think it would be quite practical. So not something the US would be interested in, but it would make a ton of sense for something like Nazi Germany where there are a ton of enemies within shooting distance.

  • TankovayaDiviziya@lemmy.world
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    2 months ago

    The wunderwaffe was a last ditch propaganda attempt to boost morale of the Germans. Which kind of worked because many Germans still believed in the “final victory” with wunderwaffes along the way to save them, in spite of the Allies being at the gates of Berlin.

    • Xanthrax@lemmy.world
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      2 months ago

      Leave it to the Germans to name their weapon after what was used to kill the diety EVERYONE liked. (Balder)

      • yesman@lemmy.world
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        3 months ago

        The Germans were notorious for using on-the-nose naming conventions. For example a radio-homing system was called “Odin”, which the British correctly guessed was using one transmitter rather than the usual two because Odin only had one eye.

  • magnetosphere@fedia.io
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    3 months ago

    Is “engine life of five hours” correct? Would the engine need replacement after five hours of flight time? Damn, that sucks.

    • ChickenLadyLovesLife@lemmy.world
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      3 months ago

      One of the under-appreciated benefits of the Allies’ successful invasion of North Africa was that it cut Germany off from their main sources of stuff like chromium, cobalt and nickel, elements that are alloyed with steel to produce material that can resist the kind of high temperatures that jet engines produce. This forced them to manufacture turbine blades from ordinary steel, which doesn’t work very well.

  • PugJesus@lemmy.world
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    3 months ago

    PING!

    Also, let’s not forget “Tank that doesn’t murder the crew when it’s mission-killed” and “Jeep”

      • ChickenLadyLovesLife@lemmy.world
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        3 months ago

        The “Long Lance” was Japanese, though. And FWIW it was never called that during the war by either side. “Long Lance” was a postwar invention by an author, and a frankly dumb one - all lances are long, that’s kind of their thing.

        • InverseParallax@lemmy.world
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          3 months ago

          I didn’t remember the name of either offhand, just that we had a supposed wunderwaffen that completely failed to detonate while the Japanese torpedo was fairly deadly.

          Looked around a little, the type 93 managed to take down a bunch of ships including the cv8 hornet.

          They were mean fuckers.

          • ChickenLadyLovesLife@lemmy.world
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            2 months ago

            The Type 93 was the most potent torpedo of the war, by an enormous margin. In retrospect, it’s kind of amazing that the other combatants mostly abandoned the concept of running torpedo engines off of compressed pure oxygen, given how much doing that added to range, speed and payload (the British did a little bit of oxygen enhancement for the torpedoes aboard the Nelsons, which of course were never used except for trying to finish off the already-destroyed Bismarck). I guess their tendency to explode on startup dampened everybody’s enthusiasm a little bit. I don’t think Hornet was sunk by one, though, since she was sunk by a submarine and Japanese subs didn’t carry them (too dangerous and heavy to have oxygen generators aboard submarines).

            People tend to poo-poo Japanese military technology from WWII, but without question they had by far the most deadly torpedoes and the most deadly guided missiles. Also the Yamatos would have beaten any battleships they encountered in a one-on-one duel, so arguably they had the best battleships, too.

            • InverseParallax@lemmy.world
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              2 months ago

              and the most deadly guided missiles.

              I see what you did there.

              Also:

              The Japanese destroyers Makigumo and Akigumo finally finished off Hornet with 4 24-inch (610 mm) Long Lance torpedoes.

              The subs crippled her, her own mates tried to scuttle and sink her but the ijn finished her with 93s.

              Oh, and the yamato/musashi were insane, crazily over built and over gunned, they could probably have taken the iowas in a fair fight, which the iowas would never have given them and won by dint of their incredible fire control and hopefully unneeded incredible damage control and resilience, coupled with better sea keeping and ludicrous speed straight to plaid.

              The iowas could have crippled the Yamato, trying to sink her was another question.

  • tal@lemmy.today
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    3 months ago

    We did have the Mark 14 torpedo, in the “disaster” category.

    Germany had her own torpedo problems, but the Mark 14 went out the door in abysmal form, and we were extremely slow to get the problems fixed. And we were fighting a war with more naval focus than was Germany.

    And while we had some work on the VT fuze and would have eventually gotten there ourselves – though time is valuable in a war – that was really the Brits. They gave us their work and we finished the work to put it into a shell.

    And some of our concepts, though we ultimately made use of them in some way, failed in their original form.

    The idea that ships would be a sitting duck for high-altitude level bombers was just wrong. Down the road, yes, but not in WW2. Billy Mitchell really oversold the state of things. And while it wasn’t catastrophic for us, it did hurt our initial ability to respond to naval forces.

    The B-17 concept that massive interlocked fields of fire from defensive guns would permit bombers to sail past fighters didn’t really work. It was in a stronger position than the Avro Lancaster for daylight bombing, but we took horrendous losses; ultimately long-range fighter escort was still required.

    The Norden bombsight didn’t really deliver the tremendous advantage that had been expected.

    We initially drastically overestimated what our early radars could do for us in naval night-fighting, and it led to things like the Battle of Savo Island. The Brits seriously bailed us out here with the cavity magnetron.

    Germany also had some significant wins. Yeah, they didn’t have the semi-auto rifle as a standard issue, whereas we had the M1 Garand. But they did have the assault rifle, in the form of the StG 44. They had the general-purpose machine gun in the form of the MG 34.

    • Maggoty@lemmy.world
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      3 months ago

      The MG 34 wasn’t as big a win as people think it is. It was a better belt fed weapon than the 1919 30 cal. But that’s because we were focusing on offensive support weapons while they were focusing on defensive ones. Thus we made the BAR and deployed it to as many squads as we could. They made the MG 34 and 42, which were better defensive weapons.

      They did have a big issue though, they used too much ammunition. Modern GPMGs fire at half or even a third the ROF. (The MG 42 could do 1500 rounds a minute!) This not only had a bad effect on supply but also severely shortened their barrel life in combat.

      Over all it seems hard to pick out the difference between a GPMG and a SAW these days but that BAR/MG 34 difference is where it’s rooted.

    • ChickenLadyLovesLife@lemmy.world
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      3 months ago

      They gave us their work and we finished the work to put it into a shell.

      And we got the price down from $750 per unit to $18, about what the shells themselves cost. And we got microwave ovens out of the deal!

  • ChickenLadyLovesLife@lemmy.world
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    3 months ago

    Of course the pic of the long-range fighter is a P-51, which always gets all the credit for that shit. But the P-47N was built to escort B-29s all the way from the Marshall Islands to Japan and back, and had a range in the neighborhood of 3000 miles - simply astonishing when you consider how short-legged fighters were at the beginning of the war (Battle of Britain Bf109s could barely make 400 miles).

  • Phen@lemmy.eco.br
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    3 months ago

    I wouldn’t mind a fighter with the range of a bomber. I end up never using fighters unless I’m being invaded because of its short range, but the initial biplanes can only be remodeled into fighters so I’ll end up having a couple of them every time. I still need to give the P-51 mustang a try, they seem to have a slightly better range.