Tunnel thrusters - Super Silent range

The Rolls-Royce range of Super Silent thruster (TT-SS) is designed for exceptionally low noise operation.  They have a double wall for the full tunnel length, with a flexible mounted inner tunnel. 

A typical thruster system normally consists of thruster unit with double mounted tunnel, hydraulic equipment, remote control and electric drive motor with starter.

All are available with controllable pitch or fixed pitch propellers and have skew blades to help reduce noise.  The drive shaft seal can be changed without removing the electric motor.