working out FT LBS TO FPS

[tye8180]

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

[mal mason]

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

that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

[18 Wheeler]

have another look at that matie

After nearly 4 years he's probably beyond caring.

[Big Dave]

that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

I think you need to look at the equation again.

[Gary C]

that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

Check your figures again. 1000ft/lb rimmie? Firing an 8 grain bullet?

[nimrod177]

that cant be right as i put my rim fire on the crono and it fired at 980 fps that would mean it was fireing under 18ftlb nar cant be should be around 900ftlb?? have another look at that matie

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.

[tye8180]

thought they had 3 power ratings that you could switch between,

[sidesy]

but to err is human my friend