Smithsonian Report, 1962. — Taylor 



PLATE 25 



1. Hub of automatic reversible propeller, hydraulic type, 1949. (Courtesy Hamilton-Standard-Propellers.) 

 A, Blade root; B, blade socket; C, holes for bearing-ball insertion; D, preloading screw; E, gear sector; F, splined 

 ring, sector to blade root; G, operating gear, meshed with gear sectors; H, piston that turns operating gear; 

 J, fi.xed cam; K, moving cam; L, oil passage to rear of piston; M, to front of piston; N, oil tube; O, stop to 

 limit blade angle; P, stop adjusting screw thread; Q, servo piston for reversing blades; R, ring that retracts 

 stop O for reversing; S, reverse stop ring. 



2. Modern planetary spur gear as used on radial engines. (Courtesy Wright Aeronautical Corp.) 1, Torque- 

 meter arm; 2, bearing on propeller shaft; 3, spline for holding sun gear stationary; 4, propeller-shaft disc carry- 

 ing pinions; 5, ring gear attached to crankshaft; 6, sun-gear spline; 7, sun gear (stationary); 8, pinions; 9, 

 pinion shaft; 10, propeller shaft. 



