Measurement of Spin Decay and Instability of Liquid-Filled Projectiles via Telemetry.
Abstract
The spin history and instability of projectiles containing a right circular cylinder filled with a liquid are determined over long flight paths. Based on past experience, stability or instability is achieved simply by adjusting the volumetric fill within the cylinder. The motion of the projectile is determined by judiciously placing photovoltaic cells behind narrow slits in the ogive portion of the projectile and sensing its orientation with respect to the sun. The cell outputs are amplified and used to drive a subcarrier oscillator which in turn modulates a P-band radio frequency oscillator. The result is transmitted to ground and recorded on tape. The spin history of a liquid-filled projectile is significantly different from a physically identical but dry projectile. Instability is indicated during the spin-up phase of the liquid motion. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1973
- Accession Number
- AD0771919
Entities
People
- Andrew Mark
- William H. Mermagen
Organizations
- Ballistic Research Laboratory