Allan Cadevi of Sweden has developed and patented what is claimed to be a new simplified method for fitting large keyless propellers. The method is based on the oil-injection system for the reduction of friction, which uses an integral hydraulic unit to drive the propeller up on the shaft. The propeller hub incorporates an axial recess which serves as a pressure chamber and the propeller nut is equipped with an axial annular flange which acts as a piston. A sealing ring or O-rings fitted on the flange prevent oil leakage. A duct passes through the propeller hub to the pressure chamber so that oil can be injected into the chamber. The propeller bore is generally tapered, 1 in 15, 20, or 30, and by using a tapered intermediate sleeve it is possible to apply the method when parallel shafting is involved. Removal of the propeller is said to be equally simple--the nut is slackened off a few turns, the hydraulic pump and injectors are connected, and, after oil has been injected into the hydraulic unit and the mating surfaces to reduce friction, the propeller slides off. The rate of slide can be controlled by regulating the flow of oil. By simple drainage of the propeller hub and the lock nut it is possible to secure or release the propeller without any other tools than the pump and injectors. The method can also be used for securing pintles and stocks in rudders of different types and for steering-gear tillers. Order from BSRA as No. 49,668.

  • Availability:
  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Publication Date: 1978-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00195363
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM