The Determination of the Fundamental Causes of Gun Jump and Dispersion of Jump
Abstract
This report describes an extended experimental investigation into the fundamental causes of gun jump. The work was commenced by the measurement of the vortical components of angular and linear muzzle movements (the gun axis being assumed horizontal) but, as these components of movement proved to represent only a small part of the total true jump, it was extended to the measurement of projectile yaw in the barrel and in the immediate post ejection zone. For the Q.F. 6 pr., which has a vertical bias in the orientation of yaw at ejection, it was found possible to separate the aerodynamic component of jump due to yaw conditions at ejection from (1) the component due to momentum gained in the post ejection zone and (2) that due to muzzle movement at ejection. For the 17 pr. tank mounted gun, which has a zero mean true jump and a random orientation of yaw at ejection, no such analysis could be made with an equipment measuring only one component of yaw. It is concluded that the yaw of the projectile in the bore, the muzzle movements at the instant of ejection and the gas flow from the muzzle all make important contributions to the gun jump and dispersion of jump.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 1959
- Accession Number
- ADA492910
Entities
People
- F. L. Uffelmann