The submersible speedboat can be carried assembled by road, rail or ship. The small size, high speed, the use of the water jet, low acoustic, electric, hydrodynamic, thermal and magnetic footprint, the silent planned displacement, with the propulsion system off and consecutive surfacing / diving, allows to act in a "noisy" environment, avoiding the need countermeasures. Fins, used as a shield, with inflatable tanks,allowing torpedo shots at very close targets.The thrust vectoring nozzle allows easy and precise boat handling in horizontal and vertical level, eliminating the bow and stern rudders. Because of low rate of positive buoyancy- with deflated elastic tanks- allows the rapid surfacing / diving and underwater navigation only on hydrodynamics. Moving accumulators, inflatable tanks on the fins and flexible fuel tanks are used as main ballast and variable tanks, and can be blowed by engine exhaust. If the density of seawater grows, the vessel will not ascent, because the elastic tanks will be compressed,so no correction needed! Diving only is used to safe approach of the target. It is possible to use external, rejected fuel tanks and accumulators. Carrying torpedoes onto the fins allows low rate of positive buoyancy, usage of wide variety torpedoes, easy loading, eliminating torpedo tubes. In case of emergency, it is possible to use the propulsion and the sonars of torpedoes. The boat consists of four modules joined in series by couplings, providing easier repair, modernization, standby, viability, reliability.
To reduce the overall weight and cost, each section has a different resistance due to shape, wall thickness and material. The spherical capsule for operators -can be rejected- withstand operational diving depth of 400m. The engine room withstand operational diving depth of 200 meters, or 300m. creating back-pressure with compressed air, which can be used for the operation of the thermal engine. These modules have no openings for periscope, antennas, so easily withstand 30,000 cycles of ascent / dive. The payload module (GRP to reduce the footprint on the radar and active sonar) with embedded flexible fuel tanks, accepts containers specialized depending of mission. We achieve a small volume of the pressure hull, limiting the ballast, reducing squeak and expansions / contractions -deteriorates hydrodynamics and hull strength, creating sonar interference - reducing vibration, thereby improving the flow of water. The crew consists of two people. Placing the capsule AFT, increases viability and decreases the load on the crew because of storm, allowing safe use of flywheel energy storage which increases the stability (increasing the possibility anointing weapon systems and simplifying boat handling) and the stored energy. The air conditioning is simple because the capsule is isolated from the engine and the battery compartment, so there are no fumes, gasses (hydrogen, carbon monoxide), dust, aerosols.
The use of sea water instead of oil in the hydraulic system will simplify it. The exhaust gases from the engines (MTU 890 or TF-50A ) are promoted under the hull to decrease resistance.