Jim Boatright's latest activity

  • J
    Jim Boatright replied to the thread Spin Drift.
    Not at all, DC. In the Coning Theory and Spin-Drift papers, I explained how and why the yaw-of-repose and spin-drift occur and...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Cranz has quite a discussion of spin-drift in high-angle firing. He says the sane things. Those high-angle effects are caused by 1) the...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Yes. All rifle bullets track up to 0.1 degrees high at reasonable ranges. The tracking angle increases with range and time of flight in...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Just thought I would mention another data point. I ran Bryan's AB point-mass solver for one of my new bullets to be fired at Whittington...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Actually, the rifle's torque reaction to spinning-up a RH-twist bullet would be leftward, top side into the body of a right-shoulder...
  • J
    Jim Boatright replied to the thread Spin Drift.
    No, I was referring to wood-block printing of artist's sketches for use in book illustrations, before photography was common.
  • J
    Jim Boatright replied to the thread Spin Drift.
    I tried looking for "drift firings" in my standard references without much luck. The effect was first discovered (about 1800) in...
  • J
    Jim Boatright replied to the thread Spin Drift.
    "Drift Firings" of rifles were all the rage in Europe in the 1870's and at Aberdeen in the '80's. Bryan Litz is duplicating them in...
  • J
    Jim Boatright replied to the thread Spin Drift.
    I little historical perspective on ELR rifle shooting. I recall reading somewhere in my bookcase of Civil War military history of an...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Let me say a few words in defense of PRODAS and other 6-DoF flight simulators. These are the most sophisticated trajectory propagations...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Please stop trying to generalize about spin-drift from a few worked examples. The next thing will be that somebody will notice that all...
  • J
    Jim Boatright replied to the thread Spin Drift.
    On the other hand, I am most interested in how today's best monolithic ELR bullets can be made to behave best at extreme ranges. I view...
  • J
    Jim Boatright replied to the thread Spin Drift.
    Please do not take those ill-advised generalizations which I made from a very small 30-caliber data set as gospel. All of this is likely...
  • J
    5.00 star(s) I have worked with Dr. Michael Courtney of MIT on a couple of ballistics projects when he was teaching at the Air Force Academy. I...
  • J
    Jim Boatright replied to the thread Spin Drift.
    The cone-on-cylinder model shows promise of yielding Iy/Ix value within 0.5 percent of the numerically integrated values for modern...
Top Bottom