| 摘要 |
<p>709,709. Screw propellers. ENGSTRAND, G. C. Aug. 23, 1950 [Aug. 24, 1949], No. 20900/50. Class 114 The blades 8 are of constant width throughout their length, this width being substantially half the distance between the helical paths described by the revolving blades. The angle of transverse inclination of the blade varies continuously from one radius to another.</p> |
