Based on SCHOTTEL’s proven PumpJet principle, the SPJ-S provides immediate auxiliary propulsion without the need for retractable deployment systems
SCHOTTEL has expanded its propulsion portfolio with the launch of the SCHOTTEL PumpJet Submersible SPJ-S, a compact auxiliary thruster developed for manned and unmanned underwater vehicles. Designed for demanding civil and military subsea applications, the system provides precise manoeuvring, high operational availability and flexible installation in space-constrained underwater platforms.
Based on SCHOTTEL’s established PumpJet principle, the SPJ-S incorporates a specially developed pressure compensation system that equalises hydrostatic pressure at the seals, enabling reliable operation at significant depths. The generated thrust can be continuously adjusted through 360 degrees, providing the underwater platform with maximum manoeuvrability.
This makes the SPJ-S particularly suitable for operations in confined waters and applications requiring high positioning accuracy, both in surfaced conditions and at great depths. The electrically driven impeller eliminates the need for a gearbox and supports smooth, low-noise operation, which is particularly beneficial for sensitive underwater missions.
Unlike retractable auxiliary propulsion systems which must be deployed before use, the SPJ-S is immediately available, and delivers thrust without time-consuming deployment procedures or protruding external components. For operators, this means faster platform readiness whenever additional manoeuvring capability is required.
The SPJ-S is mounted flush with the hull, ensuring that hydrodynamic resistance remains unchanged. At the same time, the design reduces the risk of damage in the event of seabed contact in shallow or challenging waters. Moreover, its robust construction enables controlled bottoming on the seabed, further expanding operational capabilities. Thanks to its compact installation within the outer hull, the SPJ-S can be integrated into a wide range of platforms, from Extra Large Unmanned Underwater Vehicles (XLUUVs) to submarines.
In addition to its function as an auxiliary thruster, the submersible SPJ-S can also serve as a take-home propulsion system, helping to maintain manoeuvrability in the event of a main propulsion failure. It is available in three sizes, covering a power range of approximately 50 to 990 kW.
