I've printed out the available RAM variants, as well as an experimental o-ring replacement for P1. The RAM configurations I'm looking at are:
- RAM2 (current stock version)
- RAM2 - aluminum
- RAM2O (o-ring)
- P1C (o-ring)
caliburn-rams.JPG 64.3KB 7 downloads
My intent is to profile the range of RAM options with a [k26] and a [k25]. I'm posting what I have collected so far. I've looked at RAM2, RAM2O and P1C with a [k26]. I will wrap up the run with the n and r variants after I replace the spreader I broke during testing. I'll then repeat the run with the [k25].
Testing was done with a Caldwell Chronograph and an indoor light kit. I used Worker version 1 stefan darts. To date, these Worker darts have been the most consistent and accurate with my distance and velocity profiling of the Caliburn. I'll continue to use these darts for my testing so I can compare to a larger library of past results. There are some dart types that yield higher velocities (and some lower), but I get better groupings with Worker when I'm pushing back 10's of feet for distance profiling with the chronograph using the Caliburn. Each average represents a population of 100 shots for each RAM / seal combination tested.
Here's the summary data of the average velocities recorded for the 100 shot samples per configuration that I collected. Note there's a 5% to 10% 95th percentile confidence interval around these averages (not pictured here). You can see the full stats below in the complete graphic at the end of this post.
caliburn RAM and pluger tests summary 2017-09-14.png 90.92KB 7 downloads
The air seal on the full o-ring configuration was a big improvement over my initial print of the original skirt seal configuration and you can see the impact on the velocity readings. You can see the 20 fps gap between the o-o-o configuration and the stock o-s-s configuration. That gap will likely narrow after I run some tests with a sealed bolt, but for now, I'm not sealing the bolts because I don't have enough skirt seals to glue down the bolts on all the RAMs I want to test.
Hopefully these velocity profiles will aide folks in selecting a configuration for the fps limits being targeted for different events. More to come ...
The full data sets:
caliburn RAM and pluger tests 2017-09-14sm.png 746.52KB 7 downloads