Section 1 General requirements

1.1.1 This Chapter is to be read in conjunction with the General Requirements for Machinery in Pt 9 General Requirements for Machinery.

1.1.2 This Chapter gives the requirements for the dimensions of transmission shafts, couplings, coupling bolts, keys, keyways, sternbushes and other associated components of main propulsion shafting.

1.1.3 The diameters may require to be modified as a result of alignment considerations and vibration characteristics (see Pt 13 Shaft Vibration and Alignment), or the inclusion of stress raisers, other than those contained in this Chapter.

1.1.4 For shafting enclosed within an gearbox, see Pt 11, Ch 1, 4.7 Design of enclosed gear shafting.

1.1.5 For diesel engine crankshaft and turbine rotor shafting, see Pt 10 Prime Movers.

1.2.1 In this Chapter, the dimensions of main propulsion component are determined from shaft power, P, in kW, and revolutions per minute, R, and general requirements defined in Pt 9, Ch 1, 1 General requirements.

1.2.2 For auxiliary machinery, the maximum continuous shaft power and corresponding revolutions per minute which will be used in service are to be stated.

1.3.1 Clutches for single engine propulsion plants are to be provided with a suitable means for emergency operation in the event of loss of operating fluid systems. Their suitability for short term high power operation is to be demonstrated.

1.4.1 Means are to be provided such that in the event of a failure to a shaft or coupling the occupants of the craft are not endangered, either directly or by damaging the craft or its systems. Where necessary, guards may be fitted to achieve compliance with these requirements.