| 摘要 |
The method of making a propeller and fan blading comprised of an extruded airfoil having a rib retained at the root for mounting and with a portion thereof removed by flattening the back of the blade truncating the back camber thereof in a plane tapered toward the blade tip with respect to the front camber thereof and having a flap of full configuration toward the root of the blade and continuing tangent from the front camber and extending angularly back from the back camber and reduced toward the blade tip by profiling the trailing edge made thin toward said tip by a flattening truncating the back trailing portion of the blade toward said tip.
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