I've tried to sponge-up all the data I can about truly "harmonically" tuning our FX Impacts. Understand I'm talking about tuning the harmonics of an individual gun for that gun's best accuracy potential, with air efficiency coming second. I am also not tuning for a specific FPS, until AFTER the harmonic tuning tells me what FPS (and regulator bar setting) produces the best accuracy. This can be significantly different than just tuning for the velocity that most people say works best for your pellet/caliber (which is in no way a bad place to start).
My problem has always been the time involved in truly sitting down to do this in a structured, repeatable, and results-documented manner. This can literally takes hours for just primary portions of it, as my reults show.
What really helped me was a written procedure to follow, and a PDF form I created for documentation. Plus, just taking the time required to spend the hours to complete the first major regulator characterization segment to find the some base optimal harmonic settings. Lights for night shooting on the range and a windless evening also contributed significantly.
I've uploaded the form to Dropbox, complete with my particular data, for anyone interested in seeing my particular results. After that, you can clear the fields and use the blank form for your own testing if you feel it will help you. I found it best to print the blank form, pencil in the data as I'm shooting, then fill the fields with the data afterwards for filing the records. The link for the .PDF Form is:
https://www.dropbox.com/s/hkegnjiw4ewi2xv/FX%20Impact%20X%20Harmonic%20Accuracy%20and%20Efficiency%20Tuning%20-%20SN%20184064%20-%2001OCT2019.pdf?dl=0
Finding that harmonics sweet-spot is a pain, but it exists, and it's worth looking for. It's also neat to see the data show you the air and velocity effiiecy tightening up as you make adjustments.
My results thus far show my coarse tuning results. I may be able to squeeze a little more with fine adjustments from here, but for 10-shot groups, vs 3-shot or even 5-shot groups, this is a good place to have gotten to I think.
I hope this is useful to someone else. If you have any questions, or there are any flaws in the procedure or concept, please let me know. It can be considered a work in progress that anyone can contribute to.
Also, I will make a slight change to the form later and upload a new version. Those changes will be placing input fields for both caliber and barrel length, so the form is easier to use for other calibers, vs. the header stating a fixed values of .30 cal and 700mm.
Chuck
My problem has always been the time involved in truly sitting down to do this in a structured, repeatable, and results-documented manner. This can literally takes hours for just primary portions of it, as my reults show.
What really helped me was a written procedure to follow, and a PDF form I created for documentation. Plus, just taking the time required to spend the hours to complete the first major regulator characterization segment to find the some base optimal harmonic settings. Lights for night shooting on the range and a windless evening also contributed significantly.
I've uploaded the form to Dropbox, complete with my particular data, for anyone interested in seeing my particular results. After that, you can clear the fields and use the blank form for your own testing if you feel it will help you. I found it best to print the blank form, pencil in the data as I'm shooting, then fill the fields with the data afterwards for filing the records. The link for the .PDF Form is:
https://www.dropbox.com/s/hkegnjiw4ewi2xv/FX%20Impact%20X%20Harmonic%20Accuracy%20and%20Efficiency%20Tuning%20-%20SN%20184064%20-%2001OCT2019.pdf?dl=0
Finding that harmonics sweet-spot is a pain, but it exists, and it's worth looking for. It's also neat to see the data show you the air and velocity effiiecy tightening up as you make adjustments.
My results thus far show my coarse tuning results. I may be able to squeeze a little more with fine adjustments from here, but for 10-shot groups, vs 3-shot or even 5-shot groups, this is a good place to have gotten to I think.
I hope this is useful to someone else. If you have any questions, or there are any flaws in the procedure or concept, please let me know. It can be considered a work in progress that anyone can contribute to.
Also, I will make a slight change to the form later and upload a new version. Those changes will be placing input fields for both caliber and barrel length, so the form is easier to use for other calibers, vs. the header stating a fixed values of .30 cal and 700mm.
Chuck
