JA-TT-500 stern

The JA‑TT‑500 is a stern‑mounted tunnel thruster delivering up to 60 kN of thrust from a 500 kW motor in a compact 900 mm diameter tunnel, intended for precise low‑speed maneuvering; source-listed power 500.0 kW. The supplied category identifies it as Tunnel Thruster, and it is normally installed in a bow or stern tunnel, or in a retractable housing, with an electric, hydraulic or mechanical drive and bridge control interfaces. In that role, its primary purpose is to generate transverse or steerable thrust for low-speed manoeuvring, berthing and position control. Tunnel thrusters provide lateral thrust through a fixed transverse tunnel, while retractable azimuth units can be lowered and steered to provide vectored thrust. Within the supplied list, this entry is distinguished from neighbouring variants by its model designation and the explicitly listed power; no further model-specific difference is stated in the source. No additional performance, approval or construction detail is inferred from the model code beyond the information supplied in the source record. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.