Abstract:
A submarine arrangement comprising a double hull construction forward having a wasp waist section minimizes ship displacement and permits storage of weapons in the wasp waist section.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates a submarine arrangement, and more specifically to a submarine arrangement minimizing the ship&#39;s displacement while maximizing weapons payload and ship capability. 
     Conventional nuclear submarines incorporate a torpedo room for weapons storage which is internal to a pressure hull. Typically, this arrangement also includes tubes which penetrate the inner hull and extend to the outer hull to allow weapons launch. The large internal space requirement for weapons storage and handling in such an arrangement increases the volume, and, therefore the displacement of the ship. An internal torpedo room also requires additional equipment to load weapons down through several levels of the ship into the tubes. Handling platforms, hydraulic valves, air systems, etc. are required to deliver weapons to the tubes. Moreover, alignment of the torpedo tubes and weapons handling equipment is difficult and costly. In addition, the fact that the torpedo tubes penetrate the inner pressure hull results in both an increase in ship cost and a greater risk of flooding. Additionally, the storage of weapons internal to the pressure hull governs a need for additional variable ballast tankage to compensate for the loss in ship&#39;s weight after weapons ejection. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide a minimum displacement submarine arrangement which overcomes the cost and disadvantages of the prior art. 
     Another object of the invention is to provide a submarine arrangement which minimizes ship displacement while maximizing weapons payload and ship capability and which is less expensive than conventional submarine arrangements. 
     These and other objects of the invention are attained by providing a submarine having an inner hull with a wasp waist section in which weapons may be located external to the inner hull. In this way, the invention allows for weapons payload storage and delivery without penetration of the inner pressure hull, minimizing variable ballast requirements, minimizing torpedo handling support systems, and, maximizing the effective use of space within the submarine. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Further objects and advantages of the present invention will be more fully appreciated from a reading of the following detailed description when considered with the accompanying drawings wherein: 
     FIG. 1 is a schematic view in elevation showing a representative embodiment of a minimum displacement submarine arrangement in accordance with the invention. 
     FIG. 2 is an enlarged fragmentary schematic view showing a portion of the minimum displacement submarine arrangement illustrated in FIG. 1. 
     FIG. 3 is an enlarged bottom fragmentary schematic view showing a portion of the minimum displacement submarine arrangement illustrated in FIG. 1. 
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     In the representative embodiment of the invention illustrated schematically in FIG. 1, a submarine 10 has a generally centrally located fairwater 12, a forward portion 14, a central reactor compartment 16 and an aft portion 17 including an engine room. The forward portion 14 has a double hull structure which comprises an inner hull 18 and an outer hull 20. The inner hull is formed in an hour glass shape to provide a narrow wasp waist section 22. 
     As best seen in FIG. 2, the narrow wasp waist section 22 includes a tunnel connecting a compartment 24 which is adjacent to the reactor compartment 16 with the forward compartment 26. A vertical tube 28 provides access between the wasp waist section and the fairwater 12. The wasp waist section 22 and the double hull construction in the forward portion provide space for weapons storage. 
     Except for the sanitary and potable water tanks in the bilge, there are no variable ballast tanks in the forward compartment. Instead, variable ballast tanks 25 are located forward of the reactor compartment 16 in the compartment 24, and at the aft end of the aft portion 17. In this regard, the positioning of weapons at a location external to the inner hull amidship in an area adjacent to the wasp waist section 22 eliminates the requirement for additional variable ballast tanks forward of the compartment 24. Thereby eliminating seawater piping in the forward compartment 26. 
     An enlarged bottom view of the wasp waist section 22 is shown in FIG. 3. The wasp waist 22 and the double hull construction forward provide space for up to four reconfigurable mission tubes 30. Reconfigurable mission tubes are capable of being outfitted for specific missions including strike warfare (tomahawk missiles), mine laying (gravity dropped mines 31), or special operations (equipment storage/diver lock-out). The mines may be launched by gravity releasing them from their cartridges and dropping them through a bottom hatch opening in the mission tube (not shown). Typically, the mission tubes remain dry before deploying weapons, and after the weapons are launched, they are flooded with sea water thereby minimizing variable ballast tank requirements. Each of the mission tubes has a hatch 34 to provide access from the tunnel in the wasp waist section 22 to the mission tube. 
     The mission tubes may also contain other special warfare equipment. A dry storage tube can be used to store equipment which requires careful handling such as ordinance, small arms, and weapons with solid-propellant motors. The mission tube may also be provided with a hyperbaric chamber for accommodating human divers. A wet storage tube suitably pressurized for diver occupancy permits diver access for servicing of equipment before and after use. Equipment may be placed in the upper end of the tube which is drained and equalized with the ship&#39;s ambient pressure after bottom hatch closure for easy servicing. 
     In addition, the wasp waist section 22 is arranged to accommodate external weapons modules 36. These modules may include an external weapons clip from which stored weapons may be launched. The modules 36 shown in FIG. 3 may contain torpedoes, missiles, or the like and may be extendable to facilitate launching. Such modules are described in more detail in the copending Perkowski et al. U.S. patent application Ser. No. 08/222,450 filed for &#34;Submarine External Weapons Clip&#34; assigned to the same assignee as the present application. 
     Although the invention has been described herein with reference to specific embodiments, many modifications and variations therein will readily occur to those skilled in the art. Accordingly, all such variations and modifications are included within the intended scope of the invention.