Airfoils for Tailless Airplanes: Design and Selection

Airplane Types and Moment Coefficient
Moment Coefficient and Airfoil Shape
Reflex and Moment Coefficient
Reflex and Lift & Drag
Location of Camber and Moment Coefficient
Dangers everywhere
Velocity Distribution and Boundary Layer
Airfoil Design for Light Tailless Airplanes

Location of Camber and Moment Coefficient

Luckily, there is still one parameter left to compensate for the destabilizing effect of increased camber - it is the location of the maximum camber. Its location has a small influence on the lift vs. drag polar, but a strong impact on the moment coefficient. Below, the moment coefficient vs. the angle of attack for a family of airfoils is shown. The airfoils differ in the location of the maximum camber xc/c.

Influence of the location of the camber (xc/c) on the moment coefficient.

As we can see, moving the location of the maximum camber backwards, also shifts the moment coefficient down towards negative values. Thus it might be advisable, to concentrate the camber in the first quarter of the chord length, if we want to compensate the lift loss (introduced by the reflexed camber line) by an increased amount of camber.

Reflex and Lift & Drag
Location of Camber and Moment Coefficient
Dangers everywhere

Last modification of this page: 21.05.18

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