Usage: Select the UOM system, that is English (lbs & fps) or Metric (kgs & meters), by default
english is taken & the powder type (smokeless is a default, blackpowder - if the checkbox is checked).
Type in the appropriate values & click the Calculate button. Checking/unckeckng the Blackpowder checkbox or the change of the UOM system setting causes recalculation of the given data. UOM system change converts the entered data to the corresponding UOM system, so you can use it as a converter too :)
The formulas used for calculations are:
RI=(BM*BV+PC*CM)/g*mcoef - for Recoil Impulse;
RV=g*RI/GM - for Recoil Velocity;
RE=GM*RV2/(2*g) - for Recoil Energy;
BM is bullet mass in grains or gramms, BM > 0;*
BV is the bullet muzzle velocity in ft/sec or m/sec, BV > 0;*
GM is the gun mass in lb or kg, GM > 0;*
CM is the charge mass in grains grains or gramms, CM > 0;*
g is the gravitaional constant, 32.17 or 9.81;
PC is the powder gas effective escape velocity constant, that equals 4000 (1220 for Metric) for smokeless powders and 2000 (610 for Metric) for blackpowders;
mcoef is 7000(number of grains in lb) for english system & 1000 for Metric system.
* - Only first two decimal digits are used.
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