The LNBR chronos are used in both the FT and HFT comps. I have one for setting up serviced steyrs.
The LNBR chronos are used in both the FT and HFT comps. I have one for setting up serviced steyrs.
Chairman Emley Moor F.T.C. 2023 - Misfits champ, HFT extreme champ, NEFTA hunter champ, Midlands Hunter champ, UKAHFT champ.
https://sites.google.com/site/emleymoorftc/contact-us
On the cheap chinese ones you need a calculator to change mps -fps. i use a app on my phone called air gun calc. works very well and easy to use.
This may help.
FPS = Feet Per Second, MPS = Meters Per Second, FPE = Foot Pounds of Energy
To convert to Joules multiply FPE by 1.3558, Joules to FPE multiply by .7376
To convert MPS to FPS, MPS x 3.2808399 = FPS
To convert FPS to MPS, FPS x .3048 = MPS
FPE Formula is Pellet weight (gr) x FPS x FPS divided by 450240 or 450436.7
The "formula" at the top of the page is completely wrong, it is 2 x G, not G squared. They have also used an old incorrect value for G. The calculation has used G + G which is not G squared and the way it is written would not give the answer they have if the calculation is carried out in the correct order. Also, grams and grains are measures of mass not weight, so basically whoever wrote that "formula" or carried out the calculation is mathematically ignorant. Unfortunately, only too common of people in the commercial forensic laboratories based on the evidence I saw when working.
The value 450436.7 comes when the internationally correct accepted value for acceleration due to gravity is used.
450240 is 2 x velocity of gravity x 7000, (2 x 32.16 x 7000 = 450240)
450436.7 is 2 x velocity of gravity x 7000, (2 x 32.17405 x 7000 = 450436.7)
The constant 450240 or 450436.7 depends on which value you use for the velocity of gravity.
32.16 ft/s/s or 32.17405 ft/s/s. There are 7000 grains in one pound.
The difference does not matter which ever constant is used for the FPE calculation.
Thanks for the reply Travis.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.