Magnus Measurements with the Magnetic Balance System.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1974
- Accession Number
- AD0782753
Entities
People
- Charles W. Haldeman
- Edwin P. Birtwell
- James B. Coffins
- Milan Vlajinac
Organizations
- Massachusetts Institute of Technology