Includes bibliographical references (page 6). "The proceedings of this Joint Fluid Dynamics Panel and Propulsion and Energetics Panel (33rd) Meeting, which was held at the Franco-German Research Institute in Saint-Louis, France, from 27 to 30 May 1969, are published as AGARD Conference Proceedings No. 42." "AGARD advisory report 22, also published with the same title as the present report, is the technical evaluation report written by Professor W.R. Sears of Cornell University on behalf of the Fluid Dynamics Panel."