DEMONSTRATION OF SOLID-PROPELLANT SELECTABLE-IMPULSE MOTORS
Abstract
This report demonstrates that solid-propellant boosters can be given zoning capability. The technique involves separating two grains with a thin inert combustion barrier so that all or only a fraction of the energy of the motor can be used as needed. A rocket-type igniter is used to remove the barrier and ignite the second increment. Both tandem and concentric grain configurations were successfully demonstrated. With concentric grains the barrier thickness was nominally 0.010 inch but the tandem unit required a barrier eight times as thick. Barrier and end restrictor materials were developed for a plastisol nitrocellulose composite propellant. Studies of barrier ablation under igniter gas flow made it possible to size a rocket-type igniter for a given barrier thickness. A sequencing system was shown to be applicable to this type of unit. The technology developed for concentric- cylindrical motors was successfully applied to a 6 x 33 motor having concentric star-perforated grains. The thrust level was 5800 lbf. Total burning and action times were extended by about 10% by the inclusion of the barrier, but the duration of tailoff was not appreciably affected. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1966
- Accession Number
- AD0369854
Entities
People
- S. E. Anderson