PTF 9-16
Boat Manual

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9.1.1. General remarks 
9.1.2. Propeller shaft, bracket and stern tube 
9.1.4. Vee-drive -- engine output shaft 
9.2.    LAY UP -- DOCKING
9.2.1. Lay up 
9.2.2. Docking plan 
9.1.3. Propeller shaft coupling--vee-drive 
          ON BOARD 


9.2.2. Docking plan 
9.4     Door and locker key plan 



9.1.1. General Remarks 

During the construction of the hull certain fixed datum points ore obtained and are carefully marked to facilitate future maintenance. 

These datum points are marked with triangular shaped metal plates and from these points the necessary measurements can be taken. 

When checking the propeller shaft, stern tube and propeller bracket alignment, a wire is held taut between the triangular plate mounted on the bulkhead frame 49 and a point subtended below the datum point on the outboard side of the transom as stated in article 9.1.2. 

9.1.2. Propeller Shaft, Bracket and Stern Tube 

The initial datum point of the alignment of the propulsion machinery is the forward edge of frame 55, see figure. 

By means of a wood block fixed to bulkhead frame 49, the distance of 2100 mm -- 6' 1043/64"--from the frame is obtained. 

The forward point for the alignment is found 1087 mm -- 3' 6 25132" above base line and 1200 mm -- 3' 11'5/61" -- from the centre line of the boat. The point is marked with a bronze triangle on the wood block

The after point for the alignment wire is positioned 613,3 mm -- 2' 1/8" below base line and 1200 mm -- 3' 11 15/64" from centre line of the boat. A bronze plate with groove for a plumb line is attached to the transom. The point for the alignment wire is found 1200 mm -- 3' 11' 5/64" down on the plumb line from the lower angle of the triangle. The accurate distance from frame 55 which should be 5900 mm -- 19' 4 9/32" is compensated for when the bronze triangle is mounted. 

When the boot is built the alignment tolerances in bracket and stern tube are set to 0.016". This alignment is done while the boat is still laying on the building slip. These tolerances are probably of no value when the boat is later put into a slipway. In this respect we consider that alignment tolerances for brackets and stern tubes, if they are checked for any reason, ought to be a matter of experience with this kind of boat. 

9.1.3. Propeller Shaft Coupling - Vee-drive 

In a new installation or if, for some reason new vee- drive foundations have to be installed, facilities have to be provided to take the load of the inboard end of the shaft when the coupling is on. This is best done by means of a bearing attached to web frame 53. The bearing should be lined up with the stern tube and bracket. 

The vee-drive is mounted on the foundations, and is lined up when the centre of the upper (input) flange is 852 mm -- 2' 9 35/66" from the wood block (triangle point) on bulkhead frame 49 and the same centre 237.4 mm -- 9  21/16," above top of "B"-girder. These points are found 1200 mm outboard from the centre line of the boat. When the shaft coupling is connected the distance from end of the shaft coupling flange to the wood block should be 880 mm -- 2' 10 5/8". 

Alignment of the propulsion machinery. jpg (31902 bytes)

The vee-drive is lined up in the ordinary way by using a feeler gauge with the female coupling on the shaft entered on the male coupling on vee-drive coupling (output). The feeler should preferably not be bigger than 0.020", to avoid any mistake in the distance between check point and coupling. Slots in the female coupling allow the feeler to be entered in four places, and checking should be done at top, bottom and both sides. The propeller shaft flange and vee-drive flange should be turned through 360deg. checking with the feeler every 90deg. 
The alignment tolerance is 0.002". 

When the alignment of propeller shaft flange to vee- drive flange is completed, it is necessary to check the alignment between engine and vee-drive before the shims are fitted under the engine feet. 

In a new installation the shims for the vee-drive foundations should be identified for position. Fitting bolt holes are not to be drilled until final alignment of the engine output coupling to the vee-drive input coupling has been carried out. 

9.1.4. Vee-drive -- Engine output Shaft 

In a new installation an alignment jig is used for building up, filing and drilling the foundations and shims, and a main shim should therefore as a rule never be changed when such a jig is not available. The main engine has flexible mounting brackets and could therefore not be used for fitting the main shims. However, changing the main shims should not be necessary in a finished installation, and shims will do the job for any misalignment that can occur. 

The distance between vee-drive flange and engine output flange is 20". For checking the alignment of the engine to vee-drive, a dummy shaft should be used, as the cardan shaft is flexible. This dummy shaft should have a flange for bolting to the engine output flange at one end, and a bracket for supporting a dial micrometer to read parallel alignment as well as alignment on the circumference. 

Alignment tolerances here are: 

  • parallel 0.008". 
  • Circumference 0.012". 



9.2.1. Lay up 

The length of time for which a boat is to be laid up, and the climatic conditions will determine to what extent preservation shall be carried out. 

Various navys will of course have their own preservation routines but the following general information is given: 

  1. The main engines should be preserved according to the "Deltic Maintenance Manual," article 11.1. 
  2. The auxiliary engines should be preserved according to the "Perkins Manual."
  3. The compressors should be drained of water by removing the drain plug in the bottom of the water jacket. Approximately one teaspoon of oil should be poured on the top of the H.P. and L.P. cylinders, and the compressor should be turned two complete revolutions. 
  4. The air receivers should be emptied by opening the drain valves. 
  5. The flap valves in the underwater exhaust should be closed and locked. 
  6. The 9-inch exhaust pipes in the transom should be blanked by placing the cover over the end of the pipes.
  7. The steering engine pistons should be covered with acid-free grease. 
  8. All tanks should be emptied. The fuel storage tanks can be emptied by a suction hose through the filling pipes. The coolant and lubricating oil storage tanks through drain valves. 
  9. The main sea water inlets should be closed and the valve housings drained. 
  10. The coolers and heat exchangers should be drained of water by removing the drain plugs. 
  11. All pipes should be drained and valves closed. 
  12. The storage batteries under the floorboards in the control room, should be charged, disconnected and if possible stored ashore. The terminal should be cleaned and coated with Vaseline. 
  13. The fresh water (drinking) storage tank should be emptied by the pump in the galley or in the lavatories. The valves and cocks should then be closed. 
  14. The pumps on the water closets should be drained through the drain plug. The sea water inlet valves should be closed and water in the pipes drained by loosening the pipes at the lower ends. 
  15. The log should be drained and the pitot tube removed. 
  16. The electric stove in the galley should be cleaned and the hotplates coated with Vaseline. 
  17. The boat should be cleaned throughout and the bilges drained and dried out. The bilges should be emptied by a pump on shore and the remainder of the bilge water should be dried out with rags. The fore peak should also be drained and dried out 
  18. All equipment such as mattresses, carpets, mooring ropes etc. should be aired and stored ashore. 
  19. All lockers and drawers should be left partly open to allow air circulation. The floorboards should also be partly opened for ventilation of the bilges. 
  20. The air inlets to the aft compartment and to the engine room should be closed. 
  21. All doors between the sections, the shutter between the aft compartment and the engine room and all ventilators should be left open. 
  22. All deck hatches should be closed. When the boat is laid up, it should be checked frequently. When the weather permits, the deck hatches should be opened for ventilation. 

9.2.2. Docking Plan (fig. 9.2.2.) 

The position of the various keel blocks, chocks and sup- ports is shown on fig. 9.2.2. 


Figure 9.2.2 Docking Plan jpg (43750 bytes)

In certain circumstances variation from these positions can be accepted, but it is important to have a good support under frames 53 and 60, to take the weight of the engines. 

The following should be observed during docking: 

  1. Before docking, all easily removable weights such as ammunition, mines etc. should be removed. 
    This is also necessary for safety. 
  2. The "Pilot" tube for the log should be retracted and locked in the inner position.
  3. There should not be more than 30% of fuel in the storage tanks during the docking.
    If docked with more than 30% fuel in the storage tanks, supports similar to that shown for frame 43 should be applied at frames 40 and 46, according to amount and location of fuel. 
    NOTICE: Only in emergency should docking be performed with full fuel tanks. Supports must be placed as quick as possible after docking. 
  4. Keel blocks shall be placed in a straight line 1200 mm -- approx. 47 inches -- apart, and chocks shall be placed under frames 53 or 60. 
  5. When the boat has been docked, supports have to be placed under the chine at frames 16 and 32, and under the transom at the centre line and port and starboard sides. Care should be taken that the chocks at frame 60 do not touch the water inlet scoops or the underwater exhaust outlets. 

The watertight bulkheads are marked an the hull with smell triangular metal-plates below the rubbing stroke.

 The center-lines of the rudders ore marked on the transom with smell triangular metal-plates below the water- line. 

The boat centre line is marked on the deck with one triangular metal-plate at the transom and one abaft the forward hatch. 

There must be a minimum distance of 1000 mm -- approx. 40 inches -- from the bottom of the keel to the floor of the dock to give clearance for the propellers. 

The following distances must be kept between the bottom of the keel and the floor of the dock in order to carry out certain repairs: 

  • Removing the rudders -- 1550 mm -- approx. 61 inches. 
  • Changing propellers -- 1000 mm -- approx. 40 inches. 
  • Changing propeller brackets -- 1700 mm -- approx. 67 inches. 
  • Withdrawing propeller shafts 1700 mm -- approx. 67 inches. 

To withdraw the propeller shaft a distance of 4800 mm -- approx. 16 feet -- has to be kept clear of obstruction-  abaft the stern.





Fig 9.4 Door and Locker Key Plan jpg (43598 bytes)