Despin of a Highly Spinning Object: Despin of the Army's Unattended Expendable Jammer.
Abstract
A procedure, apparatus, and theoretical and test data are described for the partial and complete design of a model unattended expendable jammer (UEJ) consisting of a circular disc of 8.9-lb (4.0-kg) weight, 2.5-in. (6.4-cm) radius, and 3.5-in. (8.9-cm) depth by using a single pair of yos. Each pair of yos consisted of Kevlar cords with either aluminum or brass weights. The results of camera and tachometer measurements of despin are presented for a total of 12 tests with initial spins in the range of 50 to 57 rps. The time for complete despin varies inversely with the initial spin velocity, and the time for despin in the present tests amounted to 20 ms for an initial spin velocity of 55 rps. Based on the presented calculations and scaling the measured test repeatability of initial spins in the range of 50 to 57 rps, a single pair of yos is believed capable of despinning the UEJ to within 3 rps of zero spin from any initial spin up to a required 260 rps. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1981
- Accession Number
- ADA107725
Entities
People
- Irvin Pollin
Organizations
- Harry Diamond Laboratories