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Sturgeon's House


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Everything posted by Collimatrix

  1. Yeah, I think I see a problem. The return spring for the bolt carrier has to be stronger than the bolt spring, or the bolt carrier cannot force the bolt into battery. The return spring is exerting the least force when the bolt carrier is near battery, because that's how springs work (Hooke's Law, yo). So there's a very fine balance between having the bolt spring be strong enough to do anything but having the bolt carrier return spring still be able to perform its job. Needless to say, this is not a good way to do things.
  2. Nanostructured bainite's day in the sun as armor may have come to an end: This is the same guy who worked on the nanostructured bainite. Apparently Tata steel has come out with the next big advance. The claims made in this video are remarkable. This steel is 550 Vickers hardness, which is about 500 Brinell. That's definitely high hardness armor by most definitions. However, the toughness is just as good as a rolled homogeneous armor like Armox 370, and it's weldable! On top of that, the steel is supposed to be reasonably inexpensive, and re
  3. M1 Garands and M14s both have the gas system on the bottom of the barrel, and both have to go to some pains to wrap around and up the sides to avoid the magazine well. What possible advantage is there to putting the gas system under the barrel?
  4. I found a very good lecture on this subject:
  5. Are there any pictures of the coolant lines that take the engine heat from the front mounted engine to the rear-mounted radiator?
  6. And the K21 that the Redback is based on is also advertised as resisting "30mm APDS" from the front, despite that arguably not being a particularly common threat in world arsenals these days. But who knows, maybe that's what the North Koreans are still using.
  7. I haven't done the extensive modelling Sturgeon has, but, to a reasonable first approximation: -Most new rifles these days are multi-lug, rotary bolt types -There's a practical limit on how many lugs the bolt's locking area can be divided into -There's a practical limit on how steep the cam track can be before the action of locking the bolt makes too much friction -Therefore there is a practical limit on how much the length needed for the bolt carrier to lock and unlock the bolt can be minimized
  8. I've been having a good time with the Knife Steel Nerds blog. It's a good balance of accessible and technical for me. The author just wrote a book, which I have purchased but not read. Obviously, it's aimed at knifemakers, but it goes enough into the basic theory of steel that it works for general metallurgy.
  9. 2020 Update: 2019 and 2020 have proven to be turbulent years for computer hardware development. Since I last posted in this thread, there have been several significant developments. 1) AMD's Navi 2, Ryzen 3000 series 7nm CPUs came out in Summer of 2019, and matched Intel CPUs in all but a few, extremely single-threaded benchmarks: The 3000 series sold more than anticipated, with significant price scalping occurring. The AMD 5000 series GPUs, based on the new RDNA architecture came out as well. They were... OK, I guess. Several of the mid and low
  10. If you would like to learn more about steel microstructures and phase changes, you should find an an actual textbook that wasn't written by someone who was strung out on heroin, unlike this one.
  11. I have learned enough about ferrous metallurgy to contribute to this discussion. Sooooo... Bainite itself isn't brittle. Bainite itself is fairly tough, but less hard than the more typical tempered martensitic steels used for armor. However, a funny thing can happen during the formation of bainite. Bainite doesn't just form; it grows within and eventually replaces crystals of a phase called austenite, like so: This is done during a special heat treating process called austempering. Compared to other heat treatment processes, austempering is fairly slow, but it also
  12. I haven't logged into your account and posted as you a long account of being sexually attracted to little boys and then banned you for it. This would suggest that some of my anger issues have been mitigated by the regimen of powerful schedule III drugs I have been taking off-label for several months. Congratulations on the successful outcome of this test. The reason we're treating what you're saying as laughable and obvious nonsense is because it is. It doesn't help that, when I very gently (by my standards) point out what's wrong with it, you just make shit up.
  13. So, even assuming that the trunnion to the rear of the magazine well is the primary limitation of the size of cartridge a rifle can handle, why do you think that two milimeters is going to make all the difference? Look carefully at this comparison of a SCAR-L with a SCAR-H.
  14. And what result do you get if you use the same measurement methodology with a picture of a Bren 2?
  15. Could you show us these measurements?
  16. FWIW, the Rolls Royce Wankel Diesel was actually built. There were, as I mentioned, a few others.
  17. OK, I have a question for true grognards. Were the HE, smoke and other ancillary rounds for the F1 105mm unique to that gun? It occurs to me that with its unique rifling twist rate, the possible L/D ratios for spin-stabilized shells would be much less than for the otherwise ballistically identical L7.
  18. Judges' remarks: Unfinished Designs: Object 138: Object 426: Bonus panel of the judges politely discussing the finer points of armored fighting vehicle powertrain design:
  19. Restricted: for Operating Thetan Eyes Only By order of Her Gracious and Serene Majesty Queen Diane Feinstein the VIII The Dianetic People’s Republic of California Anno Domini 2256 SUBJ: New tank contract awards OK, praise be to Hubbard the last prophet and Tom Cruise, his true successor and all that shit that the upper party members will want to see in an official document. You want to know Hubbard's honest truth? This entire heavy tank development program has been one big conga line of fuckups since day one. There's a reason that
  20. OK, terribly sorry this has taken so long. I have some follow-up questions I would like to ask the competitors: 1) @A. T. Mahan / @Whatismoo / @ckfinite What is the angle from the horizontal between the top of the lens of the rangefinder to the top of the roof armor package (i.e. what is the maximum depression the rangefinder works at?) 1a) Same as above, but with the front-facing periscope of the commander's cupola 2) @Xoon Did you ever work out your armor scheme? 3) @Toxn What is the height between the top of the hull fuel tank and the ceiling inside the turr
  21. What happens when Google Fiber gives up and fucks off?
  22. I saw a bunch of posts in this thread and I was worried that US politics might have gone back to being sane. But nope. Still crazy. We're good.
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