SUN 143-120. Effect of Grain-to-Motor Tube Clearance on the Performance of the 2.75-Inch FFAR.

Abstract

Annular space was found to be critical at static test temperatures of +130 degrees F. or above. At these temperatures, excessive annular space caused high chamber pressures which resulted in catastrophic motor failures or severe shape and smoothness, pressure-time defects. Motors temperature conditioned to -65 degrees F. performed satisfactorily regardless of the amount of annular space. The test data showed that for consistently reliable motor performance with respect to annular space, the doweled diameter of a MK 43 Mod 1 propellant grain should not be less than 2.464 inches. If larger than normal motor tubes are to be used, the minimum doweled grain diameter should be increased accordingly. (Author)

Document Details

Document Type
Technical Report
Publication Date
Oct 10, 1968
Accession Number
AD0676574

Entities

People

  • T. R. Trout

Tags

DTIC Thesaurus Topics

  • Clearances
  • Diameters
  • Energetic Materials
  • Materials
  • Propellant Grains
  • Propellants
  • Solid Propellants
  • Static Tests

Readers

  • Electrical Engineering
  • ballistics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster