hi there
im looking for information
how to convert
780fps to ft lbs
or a 1000fps
ive found nothing to help
so im wondering if anyone here can
thanks
hi there
im looking for information
how to convert
780fps to ft lbs
or a 1000fps
ive found nothing to help
so im wondering if anyone here can
thanks
http://extorian.co.uk/shooting/pellets.html
depends on pellet weight
8.4 grain@ 780 fps= 11.35lbft
8.4 grain @ 1000 fps=18.66lbft
aa s409k .177, cs700 stock, mtc mamba 4-16x50, logun qgs
no it wouldnt as your rim fire round would be weighing at 40grns as that is the average weight for sub sonic. therefore your rimfire running at 980 is knocking out about 85ftlb which is correct. hence if you were using high velocity rounds they weigh a lot less usually around the 32 grn weight the velocity comparable will be a lot higher.
980x980x40 divided by 450240 =85.32ftlb.
thought they had 3 power ratings that you could switch between,
aa s409k .177, cs700 stock, mtc mamba 4-16x50, logun qgs
but to err is human my friend
Rapid 7 / 10-22 ATN 2 Stiller Predator .204 Pulsar N970 Tikka T3 semi custom ATN MARS thermal.204 Tikka T3 Semi.223 Wylde IOR Operator Lawton 6mmBR Kahles Gen 3 - Stiller 6.5 x 47 Bushnell BDX - Winchester Red Performance SX3 12g
You need to know the weight of the pellet in grains (some tins do have the weight written on them).
Say you are using a pellet that weighs 7.5gns.
The formula is:
Muzzle velocity squared, multiplied by the weight of the pellet, divided by 450240.
The result is in ft/lbs.
780x780=608400
608400x7.5=4563000
4563000/450240= 10.13ft/lbs.
This is a formula that I have used since the 70's so there may be an easier or better method of working it out and if this is the case I'm sure that someone will come along and correct me.
I hope this is of assistance.
Regards,
Gary.
I think what the man is after is, the theoretical maximum muzzle velocity of a 12 ft/lbs air rifle, depending upon the weight of the pellet being used. At the end of This Link, is an image of the usual formula re-arranged to make Muzzle Velocity (in feet per second) the subject. You'll need a calculator with a square root key - use Windows' own calculator. Regards ... Geek
PauL H. - Shotgoon
Brownings: 1999 Ultra XS; 2004 B525 Field; 2010 Maxus Hunter: Air Arms 1998 Mk.2 Pro-Target, 2001 Mk.2 Pro-Sport & 2003 S400C
ok thanks
but how do i find the Muzzle velocity
on a air rifle ?
thanks
Click
You can edit the pellet list to add your pellet and weight, (look in the help file) then you can input the required ftlb and it will tell you the fps for the selected pellet, or you can input the fps and it'll tell you the power.
Alan.