I completed some distance profiling work with the Caliburn. I ran a set of VTN darts for 1, 6, 12 and 18 feet. At 18 feet the VTNs cratered in terms of being able to hit the chronograph consistently, so I truncated the run. I repeated 1, 6, 12, and 18 with the Worker stefans and got much better chronograph reading results so I continued that profiling out to 36 feet.
First up is the summary from the VTN run:
And the summary from the worker run:
You may notice the date / time stamps for the runs are not in order as presented. I did jump around in terms of how I profiled, so the distances were not collected in sequence. I sorted them in the plots so the presentation of the data made sense flowing from short to long, left to right. I presented three numbers related to the chronograph reading results - the total number of darts fired (100 in these tests), the number of readings registered (these include "errors" on the chronograph where only 1 sensor registered a reading) and recorded values where I got an actual, valid result recorded by the chronograph. For the purposes of the accuracy data, I used the registered reading values, since the dart was recorded by at least one sensor which essentially required the dart to pass through a target with a diameter of less than 6 inches to register a reading. I probably should have kept track visually as to how many darts flew through the chronograph light kit; my feeling was I only recorded values for about half of the darts that actually passed through the light kit bars. Overall I was impressed with the accuracy and consistency of the Caliburn during these tests.
If you compare the VTNs against workers in a summary view, you get a better idea of the drop-off in reading counts with the VTNs (note the velocities recorded were on average slightly lower for worker, but there was not a significant delta):
So I'm continuing to see the same characteristics from the worker darts that I saw with my Retaliator tests from earlier in the year - I get slightly lower velocities with these darts, but they seem to be more accurate. I'll try to get to additional dart types over time with the Caliburn (I have ACC and accustrike knockoffs that I'm cutting down and testing). I'm testing cut down darts at this time, as full length accuracy was horrible with the [k26], and the cutdown darts showed marked improvement.
I'm also contemplating a second methodology for better analyzing spread. The main focus here was on the velocity of the darts as a function of distance with a yes/no "did the chronograph read anything?" result with each round. I will likely drop the velocity aspect of testing for the spread profiling and try a set of concentric catch bins of different diameters, possibly split in half or quarters. I have some design and fabrication work to do there, but that may be an interesting approach to better characterizing spread. I'll post some design ideas here in the future.
For those that are interested in the eye charts I'm including the full graphics below.