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Thread: Calling all Wizards...

  1. #11
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    Quote Originally Posted by Z0MBiE View Post
    Yeah, from what I've been reading, the bullet will always(?) leave the gun at speed of the object it's fired from + the speed of the bullet.

    So if a Jet is going Mach 3 (~2280 mph) and the bullet leaves the gun at 1000 mph, the bullet would initially move away from the jet at around 3280 mph. Due to bullet drop, I doubt the jet would ever meet the bullet again.

    Makes me wonder if there is a speed at which the bullet starts being effected differently. I might have to take this one to le reddit.
    Thats not true. The speed will always affect the bullet, especially at mach speeds. It won't amount to a blocked barrel, or destroy the cartridge, but it will effect it. Still for all technical reasons, we are limited to speeds under mach 5.
    The thing is, even if a bullet is designed to fly for a significant distance under about mach 1.5 it will be slowed down very fast at higher speed, since drag increases with speed^2.
    At the same time the plane is still propelled by it's thrust. The plane sees a "static" current of oncoming air. That means that it is experiancing the same effects as a person standing in the wind; relative windspeed is all that matters.
    When Im bored enough Ill draft a quick mathematical estimation.
    The question is not, if it coul happen, it's more of when.

    Stay frosty.

  2. #12
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    I read somewhere that the bullet would just drop out of the air. But that didn't seem legit.

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    If the plane really desperately wants to shoot itself, by accelerating downwards into the bullet trajectory, it definitely can.

    Parameters that I am not certain about are the temperature and the altitude, as well as the assumed speed.
    I did a very rough estimate (but that already has to use non-linear Differential equations), with realistic parameters, not worst case, which left me with a result that said at higher altitude with mach 2 it's definitely not possible. Normal aircraft canons have a large enough caliber, so that the bullet's impulse is large enough to insure that the plane won't hit itself, when shooting while flying at supersonic (constant) speed.
    Last edited by Ronin; 04-08-2014 at 01:24 PM.

    Stay frosty.

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    Quote Originally Posted by Oisterboy View Post
    I read somewhere that the bullet would just drop out of the air. But that didn't seem legit.
    apparently that's what happens if you're going super fast and you shoot the bullet backwards.

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    Quote Originally Posted by Z0MBiE View Post
    apparently that's what happens if you're going super fast and you shoot the bullet backwards.
    That was it. Haha.

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    So someone on le reddit has confirmed:

    The round, or bullet, will always leave the barrel at the speed of the shot plus the speed of the plane. Once outside the barrel it encounters substantial wind resistance and slows down.
    So with that in mind I think at the highest speeds the bullet would just leave the barrel and drop below and toward the rear of the jet.

    Mystery solved I guess.

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    so what are you planning to do with this information

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    Quote Originally Posted by TheSkald View Post
    so what are you planning to do with this information
    Store it in my mind palace.

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    welp, just found an article that reminded me of this thread. looks like it is possible to go fast enough to shoot yourself.

    http://www.check-six.com/Crash_Sites/Tiger138260

    According to Rear Admiral William A. Schoech, assistant chief of the Bureau of Aeronautics for Research and Development, the muzzle velocity of the shells was 3,000-feet a second. Their speed through the air (the muzzle velocity plus the airplane's speed) was about 4,300 feet- per-second,

    "This would be more than 2,000 miles an hour, but their speed was immediately slowed down, because of air resistance. The plane was traveling about 880 miles an hour, better than 100 miles an hour faster than the speed of sound."

    If the airplane had kept its original course, it would have passed by them, but its steepened dive path made it intersect the bullet's down-curving path. When it hit them, they must have been moving so slowly that the airplane overtook them at a good fraction of its own air speed, which was about as fast as many a newly fired bullet.
    10 points to Ronin.

    If the plane really desperately wants to shoot itself, by accelerating downwards into the bullet trajectory, it definitely can.
    Last edited by Z0MBiE; 11-17-2014 at 02:20 PM.

  10. #20
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    No kiddin...

    xD
    Last edited by Ronin; 11-17-2014 at 06:08 PM.

    Stay frosty.

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