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TECHNICAL |
Osprey Manual
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[ Technical ] BOAT MANUALFORTHE "OSPREY'' CLASSPTF-23-26 |
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The "OSPREY" class has been developed and introduced by Sewart Seacraft, a Division of Teledyne, Inc., in close cooperation with the U.S. Navy to fulfill requirements for a fast patrol boat. The boats are being built by Sewart Seacraft, a Division of Teledyne, Inc. The Chief Designer is Kenneth Hidalgo.
The design of the 95 ft. "OSPREY" has benefited from more than twenty years of experience in rough water commercial boat use and from cooperation with the experience of the U.S. Navy personnel serving on patrol boats in the Far Fast military operation.
Sewart Seacraft has pioneered the use of aluminum in high speed patrol boats. Operating in both cold and hot climates, aluminum boats have been in service for more than ten (10) years with a very high rate of success. The low weight and high strength of aluminum in conjunction with special structural arrangements have made it possible to obtain a light weight hull with a very low vertical center of gravity.
The low vertical center of gravity and the high dead rise hull shape have given this boat the ability to carry extreme loads in both smooth and rough water with high maneuverability.
The final lines of this hull were drafted after a concentrated tank test program of more than two years at Davidson Laboratory, Stevens Institute of Technology, Hoboken, New Jersey.
The ''OSPREY" class boats may he constructed as motor gun boat, motor torpedo boat, mine layer, submarine chaser (ASW) or combined versions of these.
The boat is powered by two l8-cylinders Napier Deltic diesel engines, each of 3100 Bhp, supplied by D. Napier & Son Ltd., England.
The extremely beamy hull -- length/beam proportions being slightly above 3:1-- incorporating a V-bottom hard chine after·-part and a round-bottom fore-part gives a maximum of speed with the ability to carry heavy loads combined with good seaworthiness and maneuverability.
It is generally considered in naval circles that the "OSPREY" class will fulfill the expectations of' a fast seaworthy: fighting unit considering the reliability, range, speed, economical running, maintenance and relatively low purchase price.
For further details concerning the boat, please refer to the specifications in this manual.
Hull Specifications
Piping, Ventilation and Heating Systems [ missing sections ]
Power and Lighting Systems [ missing entire chapter ]
Fire Fighting System [ missing entire chapter ]
Operating Guide [ missing entire chapter ]
Miscellaneous [ missing entire chapter ]
Length over all ......................................................... 84' - 8"
Length between perpendiculars ................................ 85' - 0"
Beam maximum ....................................................... 23' - 2"
Beam at chine .......................................................... 18' - 6"
Max. freeboard at load weight ................................. 8' -3/4" Fwd.
Salt water draft bottom of keel at waterline ................. 4. 13'
Draft at propellers at load waterline ............................. 7.38'
Height of highest projection above waterline ................... 21'
Radar aerial height from deck ........................................ 11'
Top of bridge height from waterline to windshield ........... 15'
DISPLACEMENTS
Empty weight of boat ............................................. 150,930 lb.
Loaded weight of boat ........................................... Classified [100 ton ]
CRUISING RANGE ............................................. Classified [1500 miles ]
TACTICAL TURNING DIAMETER .................... Classified [160 yards ]
Fuel Oil .................................................................. Classified [ 74 gal ]
Lubricating oil .........................................................162 Gal.+ 75 Emergency
Emergency·· Fresh water ........................................ 200 Gal.
Fresh water coolant ............................................... 200 Gal.+ 100 Emergency
Prop Axis...................................................................13 degrees
To attain the highest possible strength with comparatively low weight of hull, the super- structure, stiffeners, and bulkheads are designed according to the most modern method of construction.
The basic construction consists of aluminum and is properly insulated to prevent electrolytic action between dissimilar metals when exposed to sea conditions.
The hull is plated with 3/8" aluminum alloy 5456-1-1321, all continuous seam welding is used, the keel is 1/2" x 12" plate capped with 3/8'' x 4" flat bar. The frames are 1/4" plate capped with 5456-111 extrusion, the chine is 3" O.D, 1/4" wall tubing. The deck is 1/4" plate, the bulkheads are 1/4" plate and the transom is 5/16" plate, the super-structure is 1/8" plate. The engine mounting foundations are reinforced 1/2" plate.
The gun foundation for the 40 MM is constructed of 3/4" plate, alloy 5456.
All gun mounts are placed to distribute stress equally on deck stiffeners.
The flying bridge is constructed of 1/8'' plate, The port lights have 1/8" protective covers.
Welds in aluminum alloys are made only with inert-gas-consumable electrode - or shielded ace process. No flux is used in welding these alloys.
