The Influence of Helical Serrations and Bullet Engraving on the Aerodynamic and Stability Properties of a Body on Revolution with Spin

Abstract

Discrepancies in the predicted and observed stability behavior of bullets sometimes occur at longer ranges. Experiments in the BRL supersonic wind tunnel and range suggest that this behavior may be due to subtle aerodynamic effects of the helical engraving. The wind tunnel tests were made at supersonic Mach numbers on spinning models with accentuated helical serrations. The tests covered a range of angle of attack, Reynolds number and mismatch between the spin of the model and the twist of the serrations. The range data were obtained on both standard ammunition and models.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1970
Accession Number
AD0719235

Entities

People

  • Maurice A. Sylvester
  • Walter F. Braun

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Ammunition
  • Boundaries
  • Boundary Layer
  • Boundary Layer Trips
  • Coefficients
  • Fluid Dynamics
  • Layers
  • Mach Number
  • Measurement
  • Physical Properties
  • Projectiles
  • Reynolds Number
  • Symmetry
  • Test Facilities
  • Wind Tunnel Tests
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Fluid Dynamics.
  • ballistics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flow