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Contains research objectives, summary of research and reports on four research projects., Joint Services Electronics Programs (U. S. Army, U.S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E), National Aeronautics and Space Administration (Grant NGR-22-009-237), U. S. Air Force Cambridge Research Laboratories Contract AF 19(628)-6066

An aerodynamic blockage investigation was conducted on a 1/16-scale model of a dynamic wind tunnel mount proposed for the Propulsion Wind Tunnel, Transonic (16T). The investigation was performed from Mach 0.60 to 1.50. The results are presented in terms of test section wall suction required to establish Mach number and static pressure distributions in the vicinity of the model. A maximum effective model blockage of approximately 4 percent occurred at Mach 1.00 to 1.10. Wall suction requirements were apparently within the maximum suction capabilities available for the Tunnel 16T. No severe pressure disturbances were measured in the proposed model location. (Author)

Dynamic stability characteristics of six Apollo-Saturn 1B and 5 and one Saturn-Centaur upper stage model configurations and static stability characteristics of two Apollo-Saturn B and 5 upper stage model configurations were obtained from M = 0.50 to 1.40. The primary test objective was to investigate the changes in dynamic stability characteristics as a function of pitch oscillation center. A secondary objective was to compare three different model mounting techniques - sting, transverse rod, and reflection plane. The static testing resulted from a suspected nonlinear phenomenon observed during the dynamic phase of the test. One model configuration which was stable when the pitch oscillation center was ahead of a separation disk exhibited limit cycle oscillations when the pitch oscillation center was located aft of the disk., Prepared in cooperation with ARO, Inc., Tullahoma, Tenn.

R. Lowndes writes from New York City to Alden Partridge in Norwich, Vermont, in order to introduce Theophilus (or Theophile) Fortier of Louisiana, who is to enter Partridge's academy in Norwich., Transcription by Raymond Bouchard. Transcriptions may be subject to error.