The torque and shaft speed (rpm) of an engine will be the same as the torque and rpm of the propeller it drives. The marine designer attempts to place this troque-rpm coincidence at a point that will be best by some criterion for the total propulsion plant, and that will be satisfactory for the individual components under all operating conditions. This is the "matching problem. Basic principles of driver-load relationships, the fundamental problem of choosing the matching point, and allowances for deteriorations in service, are developed here. Effects of towing loads and of auxiliary loads are also discussed. The use of a controllable-pitch propeller complicates the matching, since propeller pitch variations constitute a degree of freedom in addition to that provided by engine fuel control. The marine designer's task with propulsion engines driving this type of propeller is outlined.

  • Corporate Authors:

    University of Michigan, Ann Arbor

    Department of Naval Architects and Marine Engineers
    Ann Arbor, MI  United States  48109
  • Authors:
    • Woodward III, J B
  • Publication Date: 1973-6

Media Info

  • Features: References;
  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00072748
  • Record Type: Publication
  • Source Agency: University of Michigan, Ann Arbor
  • Report/Paper Numbers: No. 142
  • Files: TRIS
  • Created Date: Dec 31 1974 12:00AM