ANALYSIS OF THE DYNAMIC TESTS OF THE STRETCH YOYO DE-SPIN SYSTEM

摘要

Results of the stretch yo-yo feasibility and flight qualifica-tion tests are presented. These tests were conducted to prove the concept that the stretch yo-yo is a more accurate de-spin de¬vice than the rigid yo-yo, and to verify the analytical development of the stretch yo-yo properties. Variations in the design param¬eters and their effects on the final spin rate of the payload are noted in the analysis of the test results. The variables include initial spin rate, moment of inertia, and spring properties. Á computer solution of the test payload equations of motion is in¬cluded for comparison with the experimental results to confirm the mathematical analysis of the stretch yo-yo system. As a re¬sult of the successful flight qualification tests a stretch yo-yo was flown on Ariel I (1962 l) in April 1962.