Accession Number : AD0267268

Title :   SOME AERODYNAMIC PROPERTIES OF A 105-MM MODEL OF THE 155-MM T-358 SHELL

Descriptive Note : Memorandum rept.

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : SCOTT,W.E.

Report Date : SEP 1961

Pagination or Media Count : 34

Abstract : The aerodynamic properties of a 105 mm model of the 155 mm T-358 shell are discussed. Subsonically, at small yaw, the model has a serious case of dynamic instability as indicated by a rapid divergence of the precessional component of yaw. It is shown that this instability is due to Magnus effects, and that these effects cannot be circumvented by firing at a different spin. However, because of past experience with similar shell, it is conjectured that this dynamic instability is a small yaw phenomenon and that a limit cycle is present. As a consequence of this, the dispersion will not be markedly affected.

Descriptors :   *AERODYNAMIC CHARACTERISTICS, *PROJECTILES, DRAG, EXTERIOR BALLISTICS, SPINNING(MOTION), STABILITY, YAW

Distribution Statement : APPROVED FOR PUBLIC RELEASE