This paper describes a new range of controllable pitch propellers in which the hub design uses a moving cylinder with the servomotor cylinder positioned between the blades, features of which include very strong crank rings and an improved blade seal. The oil transfer box employs shaft mounted main pumps so that high pressure oil is contained within the rotating shaft and large diameter high pressure seals are not required. An auxiliary pump provides oil at lower pressure for operation at low shaft speeds. The main hydraulic control valve is positioned by a simplified arrangement using two auxiliary servomotor systems which also move the blades into the ahead position should the main hydraulic system fail. The standard hydraulic system includes four modules: a main high level tank; the main hydraulic module containing pumps, filters etc.; the hydraulic control module mounted on the oil transfer box; a small drain tank. Interconnecting pipework reduces shipbuilders' installation to a minimum. The paper concludes with a description of the alternative pneumatic and electric control systems provided, and mentions a prototype installation and an extensive programme of rigorous pre-service trails.

  • Supplemental Notes:
    • 45 Conference Papers presented at IMAS 73, London, 4-8 June 1973, organized by the Institute of Marine Engineers. This paper is available only in a set of 6 papers in Subject Group 9" "Stern Gear, Shafting and Propellers" at $10.00.
  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • May, E R
    • Brownlie, K
  • Publication Date: 1973

Subject/Index Terms

Filing Info

  • Accession Number: 00048491
  • Record Type: Publication
  • Source Agency: Institute of Marine Engineers
  • Files: TRIS
  • Created Date: Nov 14 1973 12:00AM