Shock Mitigation Directory

Controls

This category is separated into sub-categories of Trim Control Systems, Gear Shifters & Throttles, Steering & Wheels. Use the drop down menu under Controls to select.

Trim Controls

Trim buttons control hydraulics that change the angle of propeller thrust on outboard motors and sterndrive installations. Outboards can be "tilted up" out of the water.

Trim tabs or interceptors are fitted on the transom to improve sea keeping and performance. Electric motors or hydraulics are used to raise and lower the trim units.

Transom Jack Plates

A transom jack plate is designed to raise or lower an outboard motor vertically at the transom. It can help to improve fuel economy and increase maximum speed.

Jack plates are installed between transom and engine. Jack plates can be hydraulically operated or manually operated and can be used to reduce propeller draft.

Gear Shift Controls

One gear shift control lever is required for each inboard or outboard engine. The gear shift has three defined positions neutral (out of gear), forward and reverse.

Most outboard motors use a combined gear shift and throttle lever. The command from lever to engine can be by cable or electronically, also known as fly by wire.

Engine Throttle Controls

One throttle control lever is usually required for each inboard or outboard engine. The throttle control lever is pushed forward or "throttled up" to increase boat speed.

On multiple engine installations each throttle can be moved independently. Modern fly by wire systems enable two, three or four outboard motors to be synchronised.

Steering Wheels & Helms

Steering wheels for professional craft need to be strong enough to withstand heavy use in rough conditions. Materials include aluminium, stainless steel and composite.

Three spoke designs have more space for the hands to grip the outer rim. Additional steering wheel turn knobs can be fitted to improve speed of turning and manoeuvring.

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