| 摘要 |
<p>The propeller has blade tips each connected to a plate (4,4') forming a T-shape. The plates may be oval, round, rectangular, trapezoidal or triangular in shape, and streamlined in design. The plates sit on the propeller blade tips perpendicularly or at an angle of 60 degrees minimum and 120 degrees maximum. The propeller blades (3,3') and plates may consist of one piece or casting, or may be connected by screws, rivets, adhesive or by form-locking.</p> |
