本文研究了自由翼的翼型的几何特征，表明它们的中弧线都具有反折的特点；
The geometry of airfoils, which is proper for the free-wings, was numerically investigated and the results indicated that the airfoils must be featured by the S-shaped camber.
本文研究了自由翼的翼型的几何特征，表明它们的中弧线都具有反折的特点；
The geometry of airfoils, which is proper for the free-wings, was numerically investigated and the results indicated that the airfoils must be featured by the S-shaped camber.
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