The hydraulic power tilt system incorporates cross-port relief valves that allow the outdrive assembly to kick up in the event it encounters a subsurface obstruction or in the case of grounding, making them ideal for shallow draft applications.
An optional propeller depth adjustment mechanism can be provided to vary the propeller depth for light and loaded draft conditions. Hydraulic oil supply for the mechanism is supplied by the steering and tilt hydraulic pump. When the vessel is in shallow water, the propeller can be lifted above or even with the baseline; when in deep water, the propeller can be lowered below the baseline for maximum propulsive efficiency.
Open-wheel units are with a Gawn-series, 4-blade, high-thrust, manganese-bronze monoblock propeller. A heavy-duty anti-cavitation plate covers the propeller to prevent vortexing at light ship displacements. Nozzle units are equipped with a Kaplan accelerator-series, 4-blade manganese-bronze monoblock propeller inside a Kort 19A style steel nozzle. The propeller diameter, blade pitch and area ratio is calculated to provide either maximum static bollard thrust or maximum thrust at the required vessel speed taking into account the vessel draft conditions.