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Advice Chrono results

Discussion in 'Anything Airgun Related' started by TokaS, May 19, 2009.

  1. TokaS

    TokaS Member

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    Hi,

    after a post on another forum on home made chronos i tried the spudfiles.com one and got three results for three shots, of 554.84, 556.96 and 561.26 fp/s [differences due mainly to sloppy work within audacity picking the exact times]...

    anyway got these but i had a look at my .22 accupels and no info on average weight of a pellet....

    so can anyone tell me what the average weight is for a .22 accupel and how i convert grains in to 'what' to multiply with the speed to get a result in ft/lbs...

    thanks..hope i make sense.
     
  2. i8allthepies

    i8allthepies Posting Addict

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    Location:
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    To calculate energy in ft/lbs, multiply velocity x velocity x weight in grains, then divide this number by the constant 450240.

    So in your example 554.84 x 554.84 x 14.3 and then divide by 450240

    Comes out to 9.78 ft/lbs
     
  3. TokaS

    TokaS Member

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    thanks....i just found the weight in grains....thanks for filling the rest in for me.....

    i was wondering as i thought it seemed a bit low powered compared to my falcon lighthunter which was 11.8ft/lbs. it is still killing but the amount of drop seems worse over a shorter space than i remember....
    i know of other posts that say the s200 comes anywhere between 9 and 11ft/lbs so i just wanted to check.
    maybe i will try to make it a bit more accurate, see if it the same, and then see about trying to up the power slightly [will use friends chrono for that to get it accurate and under 12]. may eventually get a regulator put on to even out the output.
    thanks
     
  4. i8allthepies

    i8allthepies Posting Addict

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    I would say that you should check your rifle out with heavy pellets like Bisley Magnums, you might be shocked to find out how much power it is generating. You haven't said what pellets you used to arrive at the figure of 11.8 ft/lbs for your Lighthunter, but if it's Accupels you would be well over the limit with heavy pellets.

    If you look under the 'Extras' tab at the top of this page, you'll find a pellet weights table:up:
     
  5. TokaS

    TokaS Member

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    hi, it was accupels it think - may have been eley wasp though...it was 7 years ago when i had the lighthunter. tried a lot of different pellets with my s200 until i found the accupells, they proved the most accurate in it.
    will have to watch the 12ft/lbs limit whatever i do...seems a bit strange that a factory produced rifle can be pushed out with such a variance of power [if that really is the case]
    ATB
     
  6. i8allthepies

    i8allthepies Posting Addict

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    If Mr. Plod takes away your rifle for testing, he won't test it with your favourite pellets, he'll test it with the ones that produce the highest energy.
     
  7. TokaS

    TokaS Member

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    yeah thats a worry....with 30 grain magnums its showing 20ft/lbs as it is!!!! may have to tune it down, . knows what my accuples will fire at then...may just drop out the end of the barrell!!

    if i got the maths right!!??
     
  8. i8allthepies

    i8allthepies Posting Addict

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    You won't get the same muzzle velocity with 30 grain pellets, but you do need to measure it;)
     
  9. TokaS

    TokaS Member

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    hi, just checking to see when i can borrow the chrono...then i will try some. there used to be somewhere that would sell pellet variety packs [cant remember if it was someone off a forum or a shop], it would be handy to find a few different pellets but i suppose the magnums are to ones i need to set it to, then at least i'm ok!!!

    Ta
     
  10. Andy

    Andy Administrative Staff Member Founder

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  11. TokaS

    TokaS Member

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    Brilliant...that was them!!!!!
     

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