Experimental set-up
to investigate yawing motion
The drawing schematically shows the experimental set-up, which can be
applied to determine the yawing motion of spin-stabilized bullets.
After entering a photographic station, a light flash of short duration
(typically 1 millionth of a second or less) is triggered as the bullet
passes through a light barrier. By means of two mirrors (see figure above)
the bullet, at the same instant, is illuminated from two mutually perpendicular
directions. A camera is focused on the shadowgraphs of the bullet on the
two scotchlight planes. By means of this technique, the film in the camera
shows two different views of the bullet. The measurements of the visible
bullet´s contour are used to determine its spatial yaw angle, the angle
of precession and the location of the bullet´s CG.
Multiple photographic stations can be mounted behind each other, allowing
to evaluate the yaw angle d
as a function of the shooting distance x.
  
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