1993 Volume 36 Issue 2 Pages 266-271
A test sphere 100mm in diameter with programmable built-in processors was constructed to make surface pressure measurements during its free fall. The pressure data were stored in the body and transmitted to an external host computer after landing for further processing. The tests were performed under the smooth-surface condition and were compared with existing experimental data taken in wind tunnels, up to the Reynolds numbers of about 105. The results showed that the gravitational acceleration was of little importance here, and that the apparatus worked with sufficient accuracy.