Long Range Hunting Online Magazine

Do Bullets Go To Sleep?
Discussion
Previous experiments using widely accessible equipment that attempted to quantify damping of pitch and yaw were focused around a decrease in ballistic coefficients, not drag coefficients. The experiment reported here was carefully designed to eliminate as many confounding factors as possible to increase confidence in the results. To our knowledge, this is the first published data using optical chronographs in support of the theoretical prediction of reduced drag as pitch and yaw are damped out. This experimental design is expected to be useful in distinguishing between deviations from a given drag model due to the shape of a bullet and increases in drag due to pitch and yaw and should be useful in a wide variety of situations where experimenters desire to detect pitch and yaw in a given combination of bullet and rifle. Of course, introducing fourth and/or fifth chronographs to extend the technique to possible third and fourth 50 yard intervals has the potential both to better quantify the range over which pitch damping is occurring, as well as give greater certainty to the results.

Acknowledgments
This research was funded by BTG Research (www.btgresearch.org) and the United States Air Force Academy. The authors appreciate the use of Dragonman's range.

References
Walter F. Braun, “The Free Flight Aerodynamics Range,” 1958,
http://www.dtic.mil/dtic/tr/fulltext/u2/202249.pdf

Alex Halloran, Colton Huntsman, Chad Demers, Michael Courtney, “More Inaccurate Specifications of Ballistic Coefficients,” 2012, http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA555975

Bryan Litz, “Accurate Specifications of Ballistic Coefficients”, 2009a, Varmint Hunter Magazine, Issue 72.
http://www.appliedballisticsllc.com/index_files/AccurateSpecificationsofBallisticCoefficients.pdf

Bryan Litz, “Epicyclic Swerve”, accessed 2012,
http://www.appliedballisticsllc.com/index_files/EpicyclicSwerve.htm

Bryan Litz, “Pitching and Yawing of a Bullet”, 2009b,
http://www.youtube.com/watch?v=4pF8W5liSRc

Robert McCoy, “The Aerodynamic Characteristics of 7.62mm Match Bullets,” 1988, http://www.dtic.mil/dtic/tr/fulltext/u2/a205633.pdf

Robert McCoy, “Aerodynamic Characteristics of Caliber .22 Long Rifle Match Ammunition,” 1990, http://www.dtic.mil/dtic/tr/fulltext/u2/a229713.pdf



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