Page 226 - Introduction to Marine Engineering
P. 226

Shafting  and  propellers  207

          Assemble


                   Propeller boss


                    al        Oi £? nce  Hydraulic
                    Connecting  tu  ,  connection
                    _-_   *  Seal  I  /





                   I.  Nitrile
                Loading  tyfe
                ring




          Withdraw


                                              Stud













                                              Tailshaft




          Figure  11.6 Pilgrim Nut operation



          the  tyre is pressurised  the  propeller  is drawn  off  the  taper. Assembly
          and  withdrawal are  shown in  Figure  11.6.


          Controllable-pitch  propeller
          A controllable-pitch  propeller is made up of a boss with separate blades
          mounted into it. An internal mechanism enables the blades to be moved
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