Fishing Vessel Safety Regulations

19 (1) Where the propulsion shafting of a fishing vessel is driven by a gasoline engine, the tailshaft shall

• (a) be made of material having a tensile strength of not less than 372 MPa; and

• (b) have a diameter not less than the diameter of the intermediate shaft, but in no case less than 28.5 mm.

(2) Where the propulsion shafting of a fishing vessel is driven by a diesel engine, the tailshaft shall

• (a) be made of material having a tensile strength of not less than 372 MPa; and

• (b) have a diameter not less than that obtained by the following formula, but in no case less than 32 mm:

  D = 1.05 x 106.41 cubic root (H/R) x [cubic root (414/S) or 0.85, whichever is the greater] + (KP/C)

  where

  D =

  diameter of the tailshaft in millimetres,

  H =

  brake kilowatt power of the engine at continuous rating,

  R =

  revolutions per minute of the intermediate shaft at continuous rating,

  S =

  tensile strength of the tailshaft material in megapascals,

  P =

  diameter of propeller in millimetres,

  K =

  0.00079 P or 1, whichever is the smaller,

  C =

  100 for a carbon steel shaft, and 144 for a shaft

  • (i) fitted with a continuous liner,

  • (ii) running in oil,

  • (iii) made of bronze, monel, stainless steel or other corrosion-resistant alloy, or

  • (iv) fitted with non-continuous liners, when the shaft is completely covered between such liners with rubber or neoprene that has been applied and bonded.

(3) Where a fishing vessel is operated exclusively in fresh water, the diameter of the tailshaft may be 1.75 per cent less than the diameter obtained by the formula set out in subsection (2).

(4) Where the propulsion shafting of a fishing vessel is not driven by a diesel or gasoline engine, the size of the tailshaft shall be determined by the Board.