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Thread: Interesting trivia / fact regarding AR barrel life...

  1. #21
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    That's why I went with Spikes, for that extra 1/2 second

  2. #22
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    Quote Originally Posted by MikeCLeonard View Post
    I'm getting the feeling you're into chemistry or bio-chemistry along with guns, bullits, n' stuff!?
    Bravo. I don't know how you guessed from a solution to a basic physics problem, but yes, that kind of stuff.

    Unless, of course, you cheated and looked at my profile

    Or was it my avatar?
    Last edited by Warg; 12-14-11 at 23:46.

  3. #23
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    Math looks good from my little knowledge of delta v calculations from my accident reconstruction classes. Advanced math translated into beat cop.

    Well if it is around 9 seconds that is good since it drops the overall cost per hour to around 100 grand. Whew! I feel better.

  4. #24
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    Where the heck is Molon anymore? He could bust some science on this.
    "After extensive research, I picked this rifle because it came with bullets"

  5. #25
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    Quote Originally Posted by gfelber View Post
    Bravo. I don't know how you guessed from a solution to a basic physics problem, but yes, that kind of stuff.

    Unless, of course, you cheated and looked at my profile

    Or was it my avatar?

    haha...no cheating!...I guess it was your double helix avatar and ability to still rattle off equations like that! Not many people retain that knowledge without regularly employing it.
    Last edited by MikeCLeonard; 12-15-11 at 01:46.

  6. #26
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    Quote Originally Posted by a0cake View Post
    Let's say you have a 16 inch barreled AR and shoot XM193 at around 3,000 FPS. 3,000 FPS for 16 inches works out to 0.0004 seconds of dwell time in the barrel per round.

    If your barrel lasts for 10,000 rounds, then you could say that your barrel life is around 4 seconds.

    Thought someone might find that interesting. It's not really news but it's neat if you've never thought about it in that way.
    Does this take into account that the projectile does not do 3,000fps for the full 16", but rather starts at a much lower velocity and accelerates up to 3,000fps?

    If not, this statistic could be off by a whopping % amount.

  7. #27
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    Quote Originally Posted by markm View Post
    Dwell time is much longer than that. The bullet has to speed up to 3000 before it leaves the barrel.

    AR barrel life is much longer than 4 seconds.

    I think some of the 7mag or 300 win mag barrels have a 4+/- sec life though.
    ...aaaannnd did not read this before posting my post.

  8. #28
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    This is definitely an interesting spin on thinking about things.

    ETA: .......

    ETA2: I believe heat would play a large factor in barrel life. Obviously firing schedule and barrel length also play into heat/barrel life as well. A shorter barrel is going to heat up faster and retain heat longer than a longer barrel. Also, with firing schedule, dumping a mag through the rifle is going to heat the barrel up faster, and get it a lot hotter than slow firing. This data would need to be included to get an accurate depiction of realistic barrel life. I know we're just throwing around kind of an oddball, general number, and it's not extremely technical, but it was a thought that crossed my mind. Also, suppressor use would add to the heat retention of the barrel, so by deductive reasoning, dumping rounds through a suppressed 10.5" barrel vice slow firing with a 20" precision rig, you're going to see less barrel life from the short suppressed rig accuracy wise, but those types of weapons aren't necessarily designed to be accurate at distance, although some are. Shorter barreled guns do see more wear than longer guns, but also tend to be able to be used for higher round counts, because the diminishing long range accuracy doesn't affect them nearly as much for their intended use.

    Sorry, I'm rambling now. I have mental diarhea right now thinking about this.
    Last edited by viperashes; 12-15-11 at 04:24. Reason: Edited for clarity

  9. #29
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    Quote Originally Posted by WS6 View Post
    Does this take into account that the projectile does not do 3,000fps for the full 16", but rather starts at a much lower velocity and accelerates up to 3,000fps?

    If not, this statistic could be off by a whopping % amount.
    WS6, didn't you see the 11th line of the math presented?
    "First gett'n shot, then gett'n married... baaaad habits"

    "If you're gonna subscribe to hero worship, at least worship a real hero."
    M4Guru

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  10. #30
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    Thanks for reminding me of my aircraft performance/accident/physics classes. I really do miss all that. Just wish I could find a job doing it. Should have been an engineer. I would have had the Air Force eating out of the palm of my hand rather than them declining my vision waiver. Now off to take my accounting final exam :/
    Last edited by Ghost 954RR; 12-15-11 at 09:19.

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