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difference between fps and joule

  • 05-02-2011 10:31pm
    #1
    Pat sorahan
    Closed Accounts Posts: 87 ✭✭


    Hi Lads, I recently brought me jg bar-10 skirmishind in sligo and i had it chronoed and it was shooting at around 315 to 320 fps but in the corner it said the power in joules and it was 1.2. I thaught that 1J = 328fps. Hope you can help. Thanks


Comments

  • #2
    bullets
    Registered Users, Registered Users 2 Posts: 4,612 ✭✭✭bullets


    Some Chrono's can be set up to calculate different weights
    maybe it was set up for 0.25 and not 0.20

    ie 0.25 BB at 320fps would work out at 1.15j
    but a 0.20 BB at 320fps would be 0.92j

    ~B


  • #3
    Pat sorahan
    Closed Accounts Posts: 87 ✭✭Pat sorahan


    bullets wrote: »
    Some Chrono's can be set up to calculate different weights
    maybe it was set up for 0.25 and not 0.20

    ie 0.25 BB at 320fps would work out at 1.15j
    but a 0.20 BB at 320fps would be 0.92j

    ~B

    wel I was using .25's and it was set for .25g bb's :)


  • #4
    sls
    Registered Users, Registered Users 2 Posts: 82 ✭✭sls


    bullets wrote: »
    Some Chrono's can be set up to calculate different weights
    maybe it was set up for 0.25 and not 0.20

    ie 0.25 BB at 320fps would work out at 1.15j
    but a 0.20 BB at 320fps would be 0.92j

    ~B


    would this be still classed as illegal then
    0.25 BB at 320fps would work out at 1.15j
    as its over 1 joule ?


  • #5
    bullets
    Registered Users, Registered Users 2 Posts: 4,612 ✭✭✭bullets


    If the Chrono readings are correct then yep tis over the limit.

    With that said I had 3 of my guns go over the limit
    when I went to a site before. When I specifically had
    tested them myself before I arrived at the site and they were well under the limit,
    and when I got home and tested them again they were fine too.

    I'd get the gun Chrono'd again on a different Chrono
    just to re-check it, and best ask about to get a downgrade as you may turn upto a skirmish site and they wont allow you to play.
    (If you bought it new from an Irish Retailer I'm sure they would be more than happy to fix the issue for free)

    ~B


  • #6
    Inari
    Registered Users, Registered Users 2 Posts: 3,152 ✭✭✭Inari


    As Bullets said, 1 joule is NOT 328 fps. The magical number of 328fps is specifically related to 0.20g BBs. Heavier BBs require more power (i.e. joules) to get up to 328fps.


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  • #7
    Puding
    Registered Users, Registered Users 2 Posts: 6,261 ✭✭✭Puding


    there is a sticky on this as well http://www.boards.ie/vbulletin/showthread.php?t=2055353665


  • #8
    roryk1
    Registered Users, Registered Users 2 Posts: 471 ✭✭roryk1


    dont forget theres air pressure and temperature involved colder temps mean higher fps as the air is denser i dont know the scientific mumbo jumbo behind it either but iv noticed it with my aegs being chronod in different temps:confused:


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