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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

DUAL PURPOSE SEA BRAKE

The Griffiths Sea Brake is a development by Mr. V. Griffiths that has come about after many years of investigation into the problem of greater manoeuvrability at sea and also the simple requirement of being able to stop quickly when the master desires to effect an emergency stop. The sea brake is designed to brake a vessel's speed down to the desired rate and also, in an emergency, assist the rudder movement through its operation. The invention has the ability to act as an auxiliary to the available braking systems, i.e. reversal of propellers, and at the same time keep the ship's bow strictly to the direction that the master or pilot wishes it to follow. The sea brakes are large steel panels, specially built to withstand the force of the vessel's speed to weight ratio against the hydraulic pressure of the water and are calculated from the following elements: The weight of the ship; the configuration of the hull form; the tonnage to be carried; the top speed of the vessel and other marine architectural features. The propulsion effort for applying the sea brake is by hydraulic force from a hydraulic pump and there are electro-pneumatic controls to adjust hydraulic pressure to a degree where there is a minimum discrepancy in the rate of opening in all sea conditions. A special feature is that this system in new tonnage can, when closed, fit into a recess built into the ship's hull and reduce a minimum obstruction to the hull form.

  • Corporate Authors:

    Lloyd's Corporation

    Lime Street
    London EC3M 7HA,   England 
  • Publication Date: 1972-4-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00035932
  • Record Type: Publication
  • Source Agency: Journal of the Israel Shipping Research Institute
  • Files: TRIS
  • Created Date: Oct 20 1972 12:00AM