TECHNICAL

PTF 9-16
Boat Manual
Leading Particulars

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1
LEADING  PARTICULARS

Articles:

1.1  PRINCIPLE DIMENSIONS
1.2  STORAGE TANK DIMENSIONS
1.3  MACHINERY
1.4  PERFORMANCE
1.8  ARMAMENT

 

Figures:

1.5    Performance Chart
1.6    Displacement as function of longitudinal trim
1.7    Trim and metacentric heights at different flooding conditions
1.8.1 Motor gun boat
1.8.2 Motor torpedo boat
1.8.3 Mine layer
jpg (75944 bytes) jpg (54457 bytes) jpg (38096 bytes) jpg (31054 bytes)

 

1.1  PRINCIPAL DIMENSIONS OF HULL

This table illustrates the overall size of the PTF and its profile in the water at 75 tons.

 

Misc.  Measurements

Units

Height of highest projection above waterline at 75 tons

Units
Length O.A. 80' 4" Radar antenna 9' 9"
Length B.P. 75' 5" Top of bridge (radar ant lowered) 14' 6"
Beam Maximum 24' 7" Beam at Chine 21' 0"
Draft to bottom of keel at 75 tons 3' 9" Max freeboard at 75 tons 7' 3"
Draft at propellers at 75 tons 6' 10"    

 

1.2 STORAGE TANK CAPACITIES

 
Type of Tank Gallons
Fuel Oil 6100
Lubricating Oil 71
Freshwater - Ships Service 132
Freshwater Coolant 71

 

1.3 MACHINERY

  • Main engines:
      Two Napier Deltic Diesel Engines, Type T 18-37K, 3100 b.h.p. at 2100 crankshaft r.p.m.
      Integral reversing gearbox and 1.8574:1 reduction gear.
  • Vee-drives:
      Two Napier Deltic Vee-drives. Angle 18 degrees, transmission
  • Auxiliary engines:
      Two Perkins Diesel Engines P 4(M) 38 b.h.p at 1800 r.p.m.
  • Generators:
      Two Hansa self-regulating 3-phase AC, type SG. 25 4. 27.4 KVA 
      or 
      Two Onan self-regulating single phase AC generators, 15KVA, 220-V, 60 cycles. 
      Shore power is required from 220-volt single-phase supply.
  • Compressors:
      Two Wilhelm Poppe GmbH compressors, type WP 2340 S. 4.5 cu.ft. per min. at 440 lb/sq.in.

 

1.4 PERFORMANCE

When considering the performance of the boat, the dependence on the displacement, speed and range will be appreciated, bearing in mind that the speed of the boat varies approximately 1/4 knot per ton displacement.

At a fighting displacement of 70 tons (equivalent to 80 tons full load including 18 tons fuel) the boat will have the following performance:  

Maximum cruising range
Knots Miles

38

860

35

960

20

1050

Maximum Speeds
Tons Knots

70

43.5

75

43

80

42.5

The Maximum Continuous running time at 2100 RPM is 15 minutes. The engine requires an overhaul at the completion of 20 cumulative hours at 2100 RPM

Tactical Turning Diameter is less that 300 meters at a speed of 38 knots.

The trim of the boat and the internal rudder position is of some importance, and in general it is recommended there be an aft trim of between 4 to 6 inches, and that the two rudders are parallel with the boat center line.

Fig 1.5 Performance chart Performance Chart (97742 bytes)
Fig 1.6 Displacement as function of longitudinal trim Displacement Chart (85537 bytes) Range Chart (129881 bytes) Fig 1.7 Trim and metacentric heights at different flooding conditions
Fig 1.8.1 Motor Gun Boat Motor Gun Boat (32156 bytes) Motor Torpedo Boat (29989 bytes) Fig 1.8.2 Motor
Torpedo Boat
Fig 1.8.3 Mine Layer Mine Layer (34223 bytes)

1.8  ARMAMENT

** THIS SECTION OF MANUAL IS MISSING **