Abstract
Drag of a 6:1 axial-symmetric ellipsoid model parallel to tunnel flow was measured with the NAL 60cm MSBS(Magnetic Suspension and Balance System). The obtained values ranged from 0.045 to 0.055 at Reynolds number of 1 million with reference length of the model. They were compared with data sets of another source measured with a MSBS. The comparison shows that the obtained drag coefficients lie between those of 5 and 8 fineness ratio ellipsoids at Reynolds numbers more than 0.8 million. The drag was also estimated through the wake survey without the support interference. The values of the drag were near to the obtained ones with the MSBS. The observed wake looks like circle in its contour lines because of the support interference free. The flow separation was observed at about 96% chord position from nose of the model by the oil paint visualization.
