Book Description

This note is the fifth of a series covering an investigation of a number of related airfoils. It presents the results obtained from tests of a group of six low-cambered airfoils in the variable density wind tunnel. The mean camber lines are identical for the six airfoils and are of such a form that the maximum mean camber is 2 percent of the chord and is a position 0.4 of the chord behnid the leading edge. The airfoils differ in thickness only, the maximum-thickness/chord ratios being ).06, 0.09, 0.12, 0.15, 0.18, and 0.21. The results have been presented in the form of both infinite and finite aspect-ratio characteristics. The values for this group of airfoils are among the highest thus far obtained, the minimum profile drags being approximately equal to those for the symmetrical series of corresponding thickness, while the maximum lift coefficients are considerably higher.