Transonic wind-tunnel investigation of the effects of taper ratio, body indentation, fixed transition, and afterbody shape on the aerodynamic characteristics of a 45 degree sweptback wing-body combination

An investigation has been made to determine the effects of taper ratio, body indentation, fixed transition, and -??body shape on the transonic aercdynmic characteristics of a 450 sweptback wing-body conbiaation having an aspect ratio of 4. The results were obtained in the Langley %foot transonic tunnel at Mach nmibers f r o m 0.80 to 1.15, angles of attack from 00 -t;O X0, and Reynolds ntmibers varying from 1.80 x 106 to 2.00 X;l& based on the mean aerodynamic chord of the wings.The results show that the low-taper-ratio wfng has the greater drag coefficients at zero lift above a Mach rider of 0.93 and also the hlgher incremental zero-lift drag-rise coefficients.Body indentation, however, essentia-elfminates these adverse effects of lower taper ratio.Furthermore, at a Mach nzrmber of LOO, body indentation leads to an increase in maximum l i f t 4 r a g ratio of 40 percent for the lowtaper-ratio wiw and an increase of 30 percent for the higher-taperratio wTng.Although the data are not conclusive, it is possible that there is little effect from increasing the region of turbulent fl4w on the effect of indentation on the zero-llft drag-rise coefficients.,The boattailed body has greater wing-body interference than does the wingbody conibination Kith the cylindrical body.However, body indentatton reduces t h i s difference I n wing-body interference beween the two bodies.No appreciable changes in pitch-up occur with the use of body indentation.