Hydraulic Swim Platform

What is a hydraulic swim platform?

A hydraulic swim platform is the powered horizontal deck section that hangs off the back of the transom and moves vertically under hydraulic power. Pantograph arms or vertical sliding columns are bolted to the transom; a hydraulic pump and cylinders housed inside the lazarette or machinery space drive the platform up flush with the aft deck or down well below the waterline. The deck surface itself is usually a stainless-steel frame capped with teak or a composite finish.

The platform is the everyday interface between the yacht and the water. In its raised position it sits flush with the aft deck, serving as the boarding step for guests arriving by tender. Lowered to the waterline, it becomes a swim step. Submerged a metre below the surface, it doubles as a tender lift: the dinghy is floated onto the chocks and the platform is raised, lifting tender and platform together up to deck level.

Typical platform surfaces on motor yachts run from roughly 4 m² on a 30-metre yacht to 15 m² and beyond on a 60-metre-plus build. Specialist suppliers dominate the segment - Besenzoni, Opacmare and Cramm Yachting Systems are the names that recur on flagship builds, alongside Hydromar and Tenderlift. The current design trend is integration with a hinged drop transom that folds down to extend the platform into a continuous beach-club terrace.

Why it matters for yacht owners

The swim platform is one of the most-used spaces on a cruising yacht - every guest who boards from a tender, swims, dives or launches a toy crosses it.

For a buyer, three points carry weight. First, capacity: the platform's rated lift load determines whether it can launch the tender you actually want to carry. Second, integration: a platform that mates cleanly with a drop transom and a beach-club lounge above is now table-stakes on new builds above 40 metres. Third, maintenance: hydraulic seals, rams and stainless structure live in saltwater - survey reports routinely flag corrosion, ram weep and leaky valves on older systems.

Key facts

• A hydraulic swim platform is the powered aft deck section that raises and lowers via hydraulic rams driven from a pump in the lazarette or engine room.
• Surface area typically runs 4-15 m², scaling with yacht length.
• Three primary functions: boarding step from tenders, swim and beach-club extension at the waterline, and tender lift.
• Standard load ratings from leading specialists run 400 kg to roughly 1,200 kg in catalogue versions; custom builds extend to 2 tonnes and above.
• Real-world capacity limited by transom strength, not hydraulics alone.
• Leading specialists: Besenzoni, Opacmare, Cramm Yachting Systems, Hydromar, Tenderlift.
• Structure typically pickled or electropolished stainless steel; deck surface teak or composite matching the aft deck.
• Modern design trend: integration with hinged drop transom forming continuous beach-club terrace.