Book Description

An investigation was made to determine the effect of boundary-layer control by means of suction through a slot of 0.60c on the pressure distribution, lift, and drag characteristics of the NACA 64,2-432 and 64,3-440 airfoil sections. The effect on the section aerodynamic characteristics of boundary-layer control by means of a slot at 0.50c and by means of area suction from 0.55c to 0.71c was also investigated for the NACA 64,3-440 airfoil. An analysis was made to show the effect of such thick airfoil sections and boundary-layer control on the lift-drag ratio of a wing. The section data presented and employed in the analysis to the leading edges of the models. This roughness was probably more severe than that likely to be encountered on practical aircraft under normal operating conditions; therefore, the drag coefficients measured bot with and without boundary layer control may be somewhat high as compared with practical flight values.