Accession Number:

AD0718807

Title:

The Effect of Nose Shape on the Penetration of Small-Scale MK 82 Bombs in Soil

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s):

Report Date:

1970-12-22

Pagination or Media Count:

32.0

Abstract:

The effectiveness of a weapon system using the Mk 82 bomb requires that the bomb follow a specific trajectory during earth penetration to a terminal location of desired depth. This report presents the results of a preliminary investigation of the effect of nose shape, impact velocity, and impact angle on the trajectory of 125-scale models of the Mk 82 low-drag bomb in a silty sand soil. It was found that a spherical nose configuration achieves a relatively consistent and reproducible trajectory of the desired shape, and its response is less sensitive to impact angle and flight attitude than either the ogival or conical nose configurations. Scaling equations, such as those of Poncelet, Petry, Laumbach and Young, were used to predict the response of the prototype from the model tests. A theoretical expression for vertical penetration developed by John Harri was found to be applicable in the prediction of the response of the prototype. Additional tests were conducted to determine the effect of the medium on the trajectory of the projectile. From tests into clay, sand, and stratified layers of clay and sand, it was found that the effectiveness of modeling depends on the knowledge of the properties of the penetrated medium.

Subject Categories:

  • Aerial Bombs
  • Ballistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE