Posted here as I think it may be of general interest.
What velocity correlation might we expect from these two chronographs when shot together and what general conclusions may be drawn?
This morning: At a tape measured distance of 14 yards/42 ft muzzle to mid point between the Chrony sensors, I shot 10 shots simultaneously over the Chrony and the LabRadar microphone trigger to get some conclusion as to relative reliability.
The Labradar was set to record velocity at precisely 14 yards to the nearest one fps. (Note that the LR does record a number of velocities for every yard but can also have 5 user chosen yard or metre settings). Thus comparisons could be made.
14 yards was chosen as the longest range I could get for the Chrony with good sky screen access in my yard in the city (no tree shadow etc).
The measure of default 12 inches between Chrony sensors was checked as best I could - see pic: ( if you have never checked yours, it is a good idea to do so).
It took some time to line everything up including a safe target at 25 yards. A laser pointer helped and Wendy, bless her, helped with the tape.
The results were astonishing at least to me they were.
The rifle was my 16 yr old .22 Excalibre/FX 2000, which has no regulator but has shot over 70 sub inch 100 yd 5 shot groups, .
It was choked back with its transfer port adjustment screw to shoot under 12 fpe, with 15.9 gr JSBs , allowing just enough noise to trigger the LR microphone.
Raw data:
Chrony then LR same shot at 14 yards.
534.2 fps 535 fps
530.2 531
538.1 538
540.2. 540
535 535
536.8 537
538.8 539
539.3 540
537.5 538
534.2 535
Averages
536.43 536.8
Highest
540.2 540
Lowest
530.2 531
Well there is a morning's work/play and the results are most satisfactory.
Did you find that interesting?
The LR cost me US $ 550 plus exorbitant US freight charges almost three years ago. It was the first into OZ but they are now available here. It does so many things for me.
I hope you enjoyed the read as I enjoyed bringing it to you. .... Kind regards, Harry.
What velocity correlation might we expect from these two chronographs when shot together and what general conclusions may be drawn?
This morning: At a tape measured distance of 14 yards/42 ft muzzle to mid point between the Chrony sensors, I shot 10 shots simultaneously over the Chrony and the LabRadar microphone trigger to get some conclusion as to relative reliability.
The Labradar was set to record velocity at precisely 14 yards to the nearest one fps. (Note that the LR does record a number of velocities for every yard but can also have 5 user chosen yard or metre settings). Thus comparisons could be made.
14 yards was chosen as the longest range I could get for the Chrony with good sky screen access in my yard in the city (no tree shadow etc).
The measure of default 12 inches between Chrony sensors was checked as best I could - see pic: ( if you have never checked yours, it is a good idea to do so).
It took some time to line everything up including a safe target at 25 yards. A laser pointer helped and Wendy, bless her, helped with the tape.
The results were astonishing at least to me they were.
The rifle was my 16 yr old .22 Excalibre/FX 2000, which has no regulator but has shot over 70 sub inch 100 yd 5 shot groups, .
It was choked back with its transfer port adjustment screw to shoot under 12 fpe, with 15.9 gr JSBs , allowing just enough noise to trigger the LR microphone.
Raw data:
Chrony then LR same shot at 14 yards.
534.2 fps 535 fps
530.2 531
538.1 538
540.2. 540
535 535
536.8 537
538.8 539
539.3 540
537.5 538
534.2 535
Averages
536.43 536.8
Highest
540.2 540
Lowest
530.2 531
Well there is a morning's work/play and the results are most satisfactory.
Did you find that interesting?
The LR cost me US $ 550 plus exorbitant US freight charges almost three years ago. It was the first into OZ but they are now available here. It does so many things for me.
I hope you enjoyed the read as I enjoyed bringing it to you. .... Kind regards, Harry.
