Air-Arms EV2 MK.II and Chrony Beta Master chronograph

Location: Loures, Portugal
Date: 2007.10.18.
Time start: 11:30.
Time end: 13:00.
Environment average temp.: 25 Celsius / 77 Fahrenheit
Environment pressure: 29,74 inHg / 1 006,99 hPa

Rifle was tested after being used for approx. 1500 shots.
Total of 180 shots measured with Chrony Beta Master.
Initial pressure of approx. 200 bar, final pressure of approx. 80 bar.
Sampling from the competitive 150 shots (practical match autonomy).

Pellets Air-Arms Diabolo Field 4,52mm (.177") 0,547 Grams (8,44 Grains)
1 gram = 15.4323584 grains
Pellets batch reference on tin box back label  074 | 1209 | 4.52 | 74
 



Speed
Average ...................... 771,3247 fps , 235,1 mps
Maximum ................... 781,7 fps , 238,2 mps
Minimum .................... 754,2 fps , 229,8 mps
Standard Deviation ...... 4,981 fps , 1,51 mps (approx. 0,65%)

fps, foot per second
mps, meter per second
1 foot = 0.3048 meters


Energy
Average ...................... 11,15 ft.lb , 15,11 J
Maximum ................... 11,45 fb.lb , 15,52 J
Minimum .................... 10,66 ft.lb , 14 ,45 J

ft.lb = fps x fps x grains / 450240
ft.lb ,foot . pounds
J, joules
J x 0.737562149 = ft.lbs
12 ft.lb = 16,26 J

 
  Chart with the sampling of 150 competitive shots

>> Raw Data x 180 unique speed registrations
     txt, single column
     unit of speed measure is fps, foot per second

  Sample from handwritten notebook with field data records