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supported but free to move with thermal expansion. Measurement and correction of soft foot. An essential component of any successful alignment procedure is the. Alignment and verification follows by means of the gap and sag method and final alignment control by the jacking and/or strain gauge method. support the propeller or propulsor rotor. In the present context, a marine propulsion shaft connects a driving device, such as a reduction gear, engine, or procedure so as to optimize the shaft alignment and improve the service life of Compulsory inclusion of propeller loads to be taken into account in thePrinciple of Propeller Shaft Alignment. CALIFA7SEAS MARITIME ACADEMIA HANDBOOK - PART 3: OPERATION, MAINTENANCE AND REPAIR. Engr. Khairulmuzammil YUZRI. The electronic pdf version of this document, available free of charge shaft forces and moments induced by hydrodynamic propeller loads which shall be Engine and propeller shaft alignment are among the most critical aspects of propulsion system installation, reliability and maintenance. A clearance calculation on aft and forward stern tube bearings with alignment model showing only the propeller shaft supported on two stern tube bearings.