Welcome to M1911.ORG
The M1911 Pistols Organization Forums Site


John needs your help
Please read this message.


Sponsors Panel
If you intend to buy something from the companies advertising above, or near the bottom of our pages, please use their banners in our sites. Whatever you buy from them, using those banners, gives us a small commission, which helps us keep these sites alive. You still pay the normal price, our commission comes from their profit, so you have nothing to lose, while we have something to gain. Your help is appreciated.
If you want to become a sponsor and see your banner in the above panel, click here to contact us.

Results 1 to 10 of 10

Thread: Poor Man's Chronograph

THREAD CLOSED
This is an old thread. You can't post a reply in it. It is left here for historical reasons.Why don't you create a new thread instead?
  1. #1
    Join Date
    29th May 2004
    Location
    Athens, Greece, Earth
    Posts
    28,076
    Posts liked by others
    204
    Blog Entries
    2

    Poor Man's Chronograph

    Even though I am sure several of you members will have a chronograph (or have access to one), for those of us who do not, and who do not want to invest in one, the article below shows a good method to evaluate your Airsoft pistols BB's speed.

    Poor Man's Chronograph for Airsoft

    We plan to include a chrono test for each of the pistols we evaluate here, as soon as I find some ... coke cans.

    Rgds
    John Caradimas SV1CEC
    The M1911 Pistols Organization
    http://www.m1911.org

  2. #2
    Join Date
    4th February 2005
    Location
    Milky Way
    Posts
    13,901
    Posts liked by others
    52
    Would Pepsi cans work or would that invalidate the test?
    Lynnie, "Nobody realizes that some people expend tremendous energy merely to be normal. "
    - Albert Camus

  3. #3
    Join Date
    29th May 2004
    Location
    Athens, Greece, Earth
    Posts
    28,076
    Posts liked by others
    204
    Blog Entries
    2
    It all depends dear. If they are of approximate the same thickness as the coke cans, they should. I got a six-pack today, from the super market, and I plan to test the pistols I have, as soon as I can get someone to ... drink the contents (not a hard task, our 18-year old son never says no to anything which does not come out of a faucet).
    John Caradimas SV1CEC
    The M1911 Pistols Organization
    http://www.m1911.org

  4. #4
    Join Date
    11th June 2006
    Posts
    48
    Posts liked by others
    0
    Hi John, I was wondering. I don't have access to a chrono. Can we use this method on Air Rifles? BBs and lead pellets are quite different.

  5. #5
    Join Date
    1st June 2004
    Location
    Washington State
    Posts
    7,984
    Posts liked by others
    13
    Quote Originally Posted by Joni Lynn
    Would Pepsi cans work or would that invalidate the test?

    Joni, you're living up to your reputation again!
    If it isn't durable, it isn't reliable.

  6. #6
    Join Date
    4th February 2005
    Location
    Milky Way
    Posts
    13,901
    Posts liked by others
    52
    Thanks for noticing!
    Lynnie, "Nobody realizes that some people expend tremendous energy merely to be normal. "
    - Albert Camus

  7. #7
    Join Date
    2nd June 2004
    Location
    Terra
    Posts
    22,286
    Posts liked by others
    906
    Quote Originally Posted by Reverend
    Hi John, I was wondering. I don't have access to a chrono. Can we use this method on Air Rifles? BBs and lead pellets are quite different.
    The method described isn't for BBs or lead pellets -- it's for 6mm plastic airsoft pellets.

    The same method might be adapted, if you had a chronograph to use for measuring the true velocity of the BBs or pellets from a specific gun. Once you know the actual velocity, you could fire the same gun and ammo at a Coke can and document the effect.

    My guess is that BBs or lead pellets would zip right through a Coke can, so I doubt that the "test medium" is transferable.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  8. #8
    Join Date
    29th May 2004
    Location
    Athens, Greece, Earth
    Posts
    28,076
    Posts liked by others
    204
    Blog Entries
    2
    I haven't the faintest idea. I assume that what this test measures is the ability of a projectile, to pierce the various walls on the can. Surely, as Hawk says, that ability will depend on the projectile itself, but I am not sure how much the material of the projectile will affect the test. As Hawk said, there is no way to tell, unless you establish some basis for the comparison.
    John Caradimas SV1CEC
    The M1911 Pistols Organization
    http://www.m1911.org

  9. #9
    Join Date
    19th December 2004
    Location
    Elmhurst, IL
    Posts
    1,466
    Posts liked by others
    0
    Quote Originally Posted by Hawkmoon
    My guess is that BBs or lead pellets would zip right through a Coke can, so I doubt that the "test medium" is transferable.
    I can testify through much experiance killing defenseless Coke cans that BBs will fly through them like they're nothing. If you watch MythBusters you may have seen the episode where they shot through Auto windshield glass with a BB.
    "NGFL"

  10. #10
    Join Date
    25th June 2006
    Location
    Carlisle PA, USA
    Posts
    12,044
    Posts liked by others
    0

    Cheap

    Hi

    A ballistic pendulum is another way to estimate velocity of stuff like bb's and pellets. As long as you can weigh the bb's accurately it's not terribly hard to do.

    The only trick is to fiddle with the weight of the pendulum until you get a swing that you can measure easily.

    Bob

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  



Sponsors Panel
If you intend to buy something from Brownells, please use their banners above. Whatever you buy from them, gives us a small commission, which helps us keep these sites alive. You still pay the normal price, our commission comes from their profit, so you have nothing to lose, while we have something to gain. Your help is appreciated.
If you want to become a sponsor and see your banner in the above panel, click here to contact us.

Non-gun-related supporters.
Thank you for visiting our supporters.