Flight investigation at Mach numbers from 0.8 to 1.4 to determine the zero-lift drag of wings with 'M' and 'W' plan forms

Report presenting testing of the zero-lift drag of two wings, one with 45 degree sweepforward of the inboard panel and 45 degree sweepback of the outboard panel (M wing) and the other with a reverse sweep (W wing) at a range of Mach numbers. Both wings were found to have greater drag than a sweptback wing and less drag than a rectangular wing at transonic speeds. The differences were reduced at Mach numbers above 1.25.