The use of suction or injection to reduce the drag of a supersonic airliner isconsidered. It is shown that injection gives no reduction in operating costs.With suction applied to an M =2.2 aircraft on the London - New York route, thebasic operating cost of 13.30d per short ton statute mile is expected to bereduced by 0.5d for the same payload assuming no change in configuration.If the theoretical maximum skin friction reduction could be obtained the payloadcould be increased by 4750 lb. and the direct operating cost could be reduced to10.63d per short ton statute mile.
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