Improvements in or relating to propellers
600,498. Screw propellers. UNITED AIRCRAFT CORPORATION. Oct. 10, 1945, No. 26419. Convention date, Jan. 24. [Class 114] [Also in Group XXXII] To damp out vibrations a blade is provided with a conical shell 32 fitting the base 30 of the blade, this containing a ball 36 contacting a seal of larger radius. The ball space is closed by a plug 34 to which balance weights 44 can be attached. Specifications 416,255 and 437,631 are referred to.