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Collimatrix

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Collimatrix last won the day on November 25 2020

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About Collimatrix

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  1. All the early jet engines were kinda bad. The Jumo 004 had its merits, notably low cost, as it was cheaper than the fighter piston engines to produce. There are many, many, many things wrong with the Jumo 004, and people who try to oversimplify them to shoddy worksmanship or poor metallurgy are, well, oversimplifying. If you watch footage of Jumo 004s running, for instance, you'll frequently see big gouts of flame transiently come out the nozzle. This is due to big, poorly atomized blobs of fuel making it through the turbine stage and exiting the back. I think it was
  2. If you're going to be pedantic, you should at least try to be correct. This is the real fucking world we're talking about here. There isn't some infinitesimal dribble of rebound in all cases because there are plenty of sources of damping, like friction from locking, or any of the several deliberate ways to damp carrier motion as it comes into battery that I detailed in the OP.
  3. Was the entire engine in the Ikv. 91 cooled that way or just the steering system?
  4. As I understand it, this is part of why a lot of proposed nuclear space reactors have used exotic working fluids like mercury vapors to spin the turbines. Mercury can be used with a very high heat rejection temperature, which helps keep the radiators smaller.
  5. 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.
  6. 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
  7. 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?
  8. I found a very good lecture on this subject:
  9. Are there any pictures of the coolant lines that take the engine heat from the front mounted engine to the rear-mounted radiator?
  10. 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.
  11. 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
  12. 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.
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