Accession Number : AD0782753

Title :   Magnus Measurements with the Magnetic Balance System.

Descriptive Note : Final technical rept. 6 Mar 72-30 Dec 73,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Haldeman,Charles W. ; Coffins,James B. ; Birtwell,Edwin P. ; Vlajinac,Milan

Report Date : MAY 1974

Pagination or Media Count : 57

Abstract : Recent wind tunnel tests in the Magnetic Balance System at the M.I.T. Aerophysics Laboratory are described. Improvement in the balance, which holds wind tunnel models magnetically without physical supports, were required in order to obtain measurements of the aerodynamic Magnus side force on spinning bodies of revolution at angles of attack up to 10 degrees and spinning ring airfoils at angles of attack up to 3.5 degrees. Improvements described include a laser position system with an angular holding capability of .02 degrees, a data acquisition system, and model construction techniques using copper-iron composite structures. Typical aerodynamic data is presented for a 5:1 ogive cylinder at M = .27 to .43. Magnetically obtained Magnus side force data is presented which exhibits a scatter of less than 0.005 in side force coefficient. Data is also presented, which shows that in this Reynolds number range the effect of a sting can be large. (Modified author abstract)

Descriptors :   *Wind tunnel models, *Magnus effect, Gas lasers, Aerodynamic forces, Airfoils, Angle of attack, Bodies of revolution, Wind tunnels

Subject Categories : Aerodynamics
      Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE