Don, a few questions.
1) Are the amplitudes of the vertical and horizontal components correlated? I.e., if you worked to "fix" vertical dispersion would it automatically help (or hurt, or have no effect on) horizontal dispersion?
2) Have you written this up somewhere? I am way behind in my reading.
3) Just out of curiosity, what is the maximum acceleration you observed?
Toby Bradshaw
baywingdb@comcast.net
1) That would depend upon the damping technique used to reduce movement. For example, a concentric tension tube would generally affect both vertical and horizontal barrel movements in the ratios that I mentioned. Another example, a verticle "mass offset weight" that Harold Vaughn used with his railgun would primary affect only the vertical barrel movement because the "mass offset weight" was only placed in the vertical plane.
2) Yes, these discussions have taken place on this messageboard, several years ago, when Harold Vaughn initially published his "Rifle Accuracy Facts" book, and many of us BR shooters were trying confirm his findings.
3) Not sure for 2 reasons; 1. accelerometer sensors have to be routed thru band pass filter and integration circuits in order to display usable oscilliscope images, which in turn obscure/alter the direct calibrated mfg. spec. readings of these sensors. 2. was only concerned about delta changes relative to various damping techniques, was not looking for precise calibrated acceleration maximum readings.
That said, Vaughn did state a 25-30 "g" maximum vertical acceleration with his rifle measurement systems....................Don
