Accession Number : AD0786368

Title :   Blade Spindle Moment on Controllable-Pitch Propellers.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT

Personal Author(s) : Denny,Stephen B. ; Stephens,Herbert G.

Report Date : JUL 1974

Pagination or Media Count : 44

Abstract : Blade spindle moment was determined experimentally for a series of four controllable-pitch (C-P) propellers. The propellers of the series were five-bladed and the series exhibited variation in blade skew and blade area. Blade spindle moment values due to hydrodynamic and centrifugal forces are presented. These values were determined in steady state operating conditions for a large range of blade pitch settings and for the range of controllable-pitch propeller advance between the 'lock-shaft' astern operating conditions. The spindle moment data which are presented will enable designers of C-P propeller systems to estimate blade spindle moment loads and the input power necessary to rotate C-P blades during maneuvers. Recommendations are made for methods of applying blade skew to C-P propellers in order to gain improved cavitation performance and vibratory characteristics without compromising blade turning capabilities. (Modified author abstract)

Descriptors :   *Marine surface propulsion, *Propeller blades, *Spindles, *Hydrodynamics, Moments, Pitch(Motion), Loads(Forces), Thrust, Torque, Cavitation, Vibration, Experimental data

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE