• 1 Post
  • 489 Comments
Joined 2 years ago
cake
Cake day: August 15th, 2023

help-circle









  • Alumina (aluminum oxide) is what you are extracting from aluminum ore and tough as fuck, which is why it’s easier to dissolve the rest of the stuff around it first.

    Oxygen is mainly that other “junk” you have to separate with electricity. While the smelters only run at 4.5 volts (per cell), they have to push about 300kA to get the stuff up to ~950°C which breaks its chemical bond.

    You probably have never even touched pure aluminum before. Aluminum and oxygen react so quick, all we typically ever see and touch is a alumina shell.






  • And it’s about a mile? Many common rifle bullets will be starting to nope-out of supersonic around that distance, so you would need something really beefy, like a .338 Lapua or even a .50 to be accurate. (A bullet will generally start tumbling when it drops sub-sonic.)

    Don’t mistake me: many bullets can and do travel past a mile regularly, especially depending on the shot angle. Yeah, they can still kill. I am referring to the uncertainty and inaccuracy at those ranges, especially if a bullet has lost a ton of speed.

    My main point is that long range sniper rifles are quite large caliber and generally require long heavy barrels. You aren’t going to swing one of those around without being noticed.

    The shot speed approximation is the easy part, believe it or not. Since the bullet must be a large caliber you can guess at about 200-300 grains for a “smaller” large caliber bullet, or between 650-900 grains for a larger one. (Maybe a few more, but I am sticking with a 338 or a 50.) Muzzle velocity is also going to be on the high end at between 2900fps and +3100fps for most all of them. The math is easy to work out with a common ballistics calculator by estimating the ballistic coefficient of available bullets in the category we are talking about. (Bullet speed at the target is the most important number to calculate.)

    Still, it’s not perfect math. If you look for a camera flash at an estimated time when a bullet was supposedly fired, you are probably going to find one, especially if you have a second or two of footage across multiple cameras.