The system was modified to allow the suspended model freedom to spin whilst retaining control of the other rigid body degrees of freedom. Force and moment read-out was obtained from calibration of the suspension electro-magnet currents. The model was spun up using air jets and the mechanism retracted leaving the model rotating and free from flow interference. The Magnus force signals were recorded on magnetic tape during the gradual decay of spin rate for subsequent digital analysis. Typical test data is presented showing a strong influence of tail region geometry on Magnus force. This indicates that a mechanical support at the tail should be avoided and illustrates the usefulness of magnetic suspension in aerodynamic testing.
The measurement of Magnus force and moment using a magnetically suspended wind tunnel model
Die Messung von Magnus-Kraft und -Drehmoment in einem Windkanalmodell mt magnetischer Suspension
IEEE Transactions on Magnetics ; MAG-11 , 5 ; 1514-1516
1975
, 3 Quellen
Aufsatz (Zeitschrift)
Englisch