![]() ![]() Their rights are fully recognized and these companies are kindly asked to inform me if they do not wish their names to be used at all or to be used in a different way. This document may accidentally refer to trade names and trademarks, which are owned by national or international companies, but which are unknown by me. Recompilation of the given material is not allowed, if the resulting product is This document for a publication, you have to cite the source. You may use the data given in this document for your personal use. IĬannot take any responsibility for actions you perform based on data,Īssumptions, calculations etc. Any statements may be incorrect and unsuitable for practical usage. This is a privately owned, non-profit page of purely educational Want to send me a copy of your e-mail after a month or so. It might take some time until you receive anĪnswer and in some cases you may even receive no answer at all. Suggestions? Corrections? Remarks? e-mail:ĭue to the increasing amount of SPAM mail, I have Airplane Types and MomentĬoefficient Moment Coefficient and Airfoil Shape Reflex and Moment Coefficient Lines, as they are used in tailless planes with no or little wing sweep. Thus the following sections will concentrate on airfoils with reflexed camber Interesting to develop, because they are very sensitive with respect to changes From theĪerodynamicists view, airfoils with `reflex´ are quite difficult and very The moment coefficient poses no strong restriction on the airfoil shape.Ĭlasses of tailless airplanes and their typical airfoil shapes.Īirfoils with strongly reflexed camber lines are usually not used onĬonventional airplanes - they are unique to tailless airplanes. wing with a low position of the center of gravity (parafoil).The objective of the optimization is to find the airfoil that enables a maximum lift-over-drag ratio for a target lift coefficient of 0.6. Low moment coefficients and a small amount of twist can be achieved byĪirfoils with little camber and a neutral or slightly reflexed camber line. The shape is adapted by radial basis functions mesh morphing using four parameters (angle of attack, thickness, camber and maximum camber position). A twist does not help for stability, but can improve the stall The only way to achieve a positive moment coefficientĪnd the required amount of lift is to use a S-shaped camber line, whichĪ positive moment coefficient results in a reflexed camber W airfoils: waspsm-il - WASP (smoothed) wb13535sm-il - WB-135/35 13. The requirements for the threeĬlasses of tailless planes can be translated in corresponding airfoil shapes and Which is distributed along the camber line. The shape of an airfoil can always be thought of being composed of two parts:Ī camber distribution (camber line) and a thickness distribution, Layer Dangers everywhere Airfoil Design for Light Tailless Airfoil Design for Tailless Airplanes: 2 Airfoils for Tailless Airplanes: Design and Selection Airplane Types and MomentĬoefficient Moment Coefficient and Airfoil Shape Reflex and Moment Coefficient Reflex and Lift & Drag Location of Camber and MomentĬoefficient Velocity Distribution and Boundary ![]()
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