If the propulsion system is in danger of an engine stalling, a propeller shaft brake should be considered. In any case, proper control timing and sequence are important to the equipment. Propeller inertia torque is a factor under crash reversal conditions on hydraulically actuated reverse- reduction gear applications. The propeller inertia torque load on clutches, reverse gear and engine can be reduced by two-thirds if the propeller is brought to a stop before the reverse clutch is engaged. Propeller inertia torque is not normally a factor on a pneumatic clutch application. Propeller back torque, under a crash reversal condition, on some applications, can be higher than the low speed engine torque. If this is the case, the engine will stall. If the propeller is stopped, the vessel velocity will be reduced to a level that a reversal can be accomplished without stalling in approximately one-half the time required if the propeller is allowed to freewheel.

  • Supplemental Notes:
    • Prepared for SAE meeting, August 11-14, 1975.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Mathers, H M
    • Kammeyer, D J
  • Publication Date: 1975-8

Media Info

  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00128394
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: 750715 Preprint
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM