Accession Number : AD0283972

Title :   PERFORMANCE AND BLADE TORQUE OF A SERIES OF CONTROLLABLE PITCH PROPELLERS

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : POWELL,S.C.

Report Date : JUN 1962

Pagination or Media Count : 20

Abstract : Propulsion performance and blade spindle torque measurements are reported on a series of controllable pitch propellers, in regions of both ahead and reverse running. The blade torque measuring mechanism is satisfactory for cases in which large torques are expected. For regions of operation or designs in which these torques are small, an elastically restrained arrangement should be substituted for the flip-flop indication of the pre ent evic . The d sig of ela ically restr ined i strumentation r quires careful consideration of the effect of ven elastic deformation on the blade torque. For most engineering applications the performance coefficients for controllable pitch propellers can be the same as for a series of normal similar propellers having the pitch ratio to which the controllable blades are adjusted. The data can be used to estimate performance coefficients and blade torques for normal running ahead and reverse. (Author)

Descriptors :   *PROPELLERS (MARINE), *VARIABLE PITCH PROPELLERS, DESIGN, PROPELLER BLADES, TEST METHODS, TORQUE

Distribution Statement : APPROVED FOR PUBLIC RELEASE