Low cost hybrid propulsion submarine concept design

Nuclear Submarines (SSNs) and Conventional Submarines (SSKs) have traditionally been approached with entirely different design philosophies. SSN designs are typically ocean going and offer endurance limited only by stores and crew. SSK designs, whilst traditionally smaller than SSN designs, are capable of operations in littoral waters and deploy low signature propulsion systems compared to SSN boats. The purpose of this paper is to present the concept design of a low cost hybrid propulsion submarine. The design is an amalgam of an ocean going SSN and littoral operating SSK, with long endurance & high transit speeds of SSNs and quiet & littoral capabilities of SSKs. The study will explore tradeoffs between payloads (ammunition) options, sensors and types of propulsion systems. The task is uphill and the technologies considered need to be proven at this point in time, however, the results envisaged are very promising. The selection of technology and sizing of each element of the nuclear/conventional hybrid propulsion system is discussed in detail. The concept of mission specific ammunition has been applied as a major strategy for cost reduction. This is materialized through a Payload Delivery Tube (PDT) covering range of ammunition options including UUVs. The propulsion system is fully electric comprising of a compact nuclear power plant and an onboard rechargeable AIP (Air Independent Propulsion) system.