AIR-DROPPED EARTH PENETRATORS

AN AIR-DROPPED SUBSURFACE TERRABALLISTIC PROJECTILE THAT HAS BEEN DEVELOPED FOR USE IN SOIL SITE STUDIES IN REMOTE OR INACCESSIBLE AREAS IS DESCRIBED. THE TECHNIQUE INVOLVES DROPPING OR PROPELLING AN INSTRUMENTED EARTH-PENETRATOR FROM AN AIRCRAFT FLYING OVER THE STUDY SITE. SINCE NO GROUND SUPPORT IS REQUIRED, REMOTE SITES CAN BE STUDIED EASILY. THE PROJECTILE, WHICH IS DESIGNED TO PENETRATE DEEP INTO SOIL, CARRIES INSTRUMENTS AND ON-BOARD TRANSMITTING (TELEMETRY) SYSTEMS THAT RADIO BACK TO THE AIRPLANCE THE SOIL RESISTANCE FORCES FELT AS THE PENETRATOR SLOWS TO REST, IN A FEW TENS OF MILLISECONDS, DEEP BELOW THE GROUND SURFACE, THE SITES STUDIED TO DATE, THE BASIC PROJECTILE MECHANICS INVOLVED, THE USE OF TERRABALLISTIC PROJECILES AT A SPECIFIC SITE, AND THE COST OF THE METHOD ARE DISCUSSED. THE WORK DESCRIBED AND THE DATA COLLECTED HAVE SHOWN THAT SOIL INVESTIGATIONS USING TERRABALLISTIC PROJECTILES CAN BE USEFUL, PROVIDED: APPROXIMATE DATA, ABOUT EQUIVALENT TO THE STANDARD PENETRATION TEST, ARE ADEQUATE FOR THE PROJECT, THE AREA IS REMOTE AND INACCESSIBLE, SO THAT CONVENTIONAL INVESTIGATIONS ARE EXPENSIVE OR IMPRACTICAL, AND TIME IS IMPORTANT, AND THE PROJECT CANNOT WAIT FOR THE SLOWER METHODS OF CONVENTIONAL INVESTIGATIONS.

  • Supplemental Notes:
    • Vol 32, No 4, PP 72-78
  • Authors:
    • Margason, E
    • Trantina, J
    • McNeill, R
  • Publication Date: 0

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00228553
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:37AM