LM Hydraulics Mallorca
LM Hydraulics Mallorca Services
About LM Hydraulics
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Carretera Puigpunyent 78, Locale 6, Poligono Can Valero, 07011, Palma de Mallorca
Tel: (+34) 971 25 3006 Fax: (+34) 971 25 3007



  Nautical Structures' Passerelles & Gangplanks
The Nautical Structures design philosophy is that the passerelle is the yacht’s grand entranceway, providing the owners and guests their first experience with the yacht and the pending yachting experience. The passerelle must be constructed in a style and quality commensurate with that of the yacht. The passerelle must be sturdy and steady while boarding; a guest should not feel the passerelle deflecting or moving under-feet while boarding. Once one boards a Nautical Structures’ passerelle the feeling should be as if one was already on the yacht’s deck. We understand that for some persons, crossing over ten to twelve feet of open water is an unnerving experience, so the passerelle should provide an enhanced level of security and well-being while boarding. Nautical Structures passerelles always include rigid hoop-railing systems that will support the weight of an individual returning from an evening of libations!

Nautical Structures does not manufacture the greatest number of passerelles, but every year we do produce a few of the industries’ finest passerelles. Nautical Structures’ passerelles are manufactured to-order and specific for each project, based on one of our over twenty-four engineered designs. We offer single and double-telescoping planks, fold-over and fold-under designs, with and without additional telescoping plank sections. We have developed a specialized swimplatform-integrated design that also deploys as a tender-dock while the vessel is moored offshore. We have built Passerelles that double as small cranes (PassaCranes), and have even built a specialized passerelle that deployed from a box built into the cockpit bulwark of a large cockpit-style motor yacht. Nautical Structures’ planks are available in three widths to facilitate the available storage space and the grandeur of the vessel. We will incorporate unique features such as self-leveling boarding areas, wheelchair ramps, fiber-optic lighting and custom-styled rails based on the desires of the client.

Yacht designers and naval architects should consider the big-picture when specifying a passerelle with their client. Storage space most dramatically affects the design and cost of a passerelle. As a rule, the longer the passerelle enclosure, the less complicated (read less expensive) the passerelle becomes. As a yacht becomes larger, there is a need for more distance maintained between the stern of the yacht and the dock when moored. This results in a longer deployed-length plank requirement, which impacts the enclosure length requirement. As the passerelle’s enclosure length is reduced, additional features such as a folding plank, or a telescoping plank is required. Sometimes both folding and telescoping features are required to fit a passerelle into a smaller available storage space. Designers and architects should also pay attention to the specific needs of the client. Will the yacht travel the world and have to adapt to a large variety of boarding situations? Will there ever need to be wheelchair accessibility? Is the client elderly or obese and require additional boarding width? Will the vessel use the stern entry and thus use the passerelle as the primary entry point of the yacht? Answering these types of questions will ensure that the passerelle is designed adequately for the intended use of the yacht.

Nautical Structures’ passerelles are designed and built to be “Plug and Play” type installations. All of the critical assembly and adjustments are made in our factory prior to delivery to the shipyard. The most critical element of the installation is that of the enclosure. Ours are built watertight, and often will incorporate the hydraulic transom door-opening mechanism. Compliance with the Mega Yacht Code for transom door openings is to be considered. Once the shipyard has installed the enclosure, the passerelle may be inserted into the opening, and the hydraulic lines routed through the enclosure and onto the control manifold.

All of the critical service and maintenance points are located outside of the passerelle’s enclosure and mounted adjacent to the enclosure in available engineering spaces. A Nautical Structures passerelle drives itself in and out of the enclosure without using cylinders, belts or chains. This feature reduces operational noise and will allow the passerelle to be pushed into the enclosure without damage in the event the plank is pulled off of the dock by a tidal surge and then pushed against the seawall. Typical routine maintenance is liberal freshwater wash downs after each deployment and periodic lubrication of the luff and slew points. The teak walking surfaces should be maintained as one maintains the yacht’s decks.

A brief synopsis of Nautical Structures’ passerelles unique and notable features include:

• Defined deflection criteria, maintaining a minimal of plank-end deflection when deployed without wheel support from the dock. This eliminates the uncomfortable “Diving Board” effect felt in the ones on other planks.

• Self-centering feature that positions the plank for travel in and out of the enclosure, without the use of electrical and undependable limit switches, proximity sensors or PLCs. Our planks utilize a dual-hydraulic-cylinder configuration that positions the passerelle hydraulically, with total repeatable accuracy over the life of the passerelle.

• Slew-lock safety feature, uses hydraulics to eliminate plank-end motion, particularly when boarding from the side of the passerelle. The plank will not kick-out from under a person when boarding.

• Hydraulic safety circuits, which allow the plank to relieve and move when making contact with any dock structure. This allows the plank to luff up on an outgoing tide, and the plank to retract into the enclosure in the event of a plank-end impact with the dock with out structural damage to the passerelle or the yacht.

• The self-propelled drive feature which allows the passerelle to drive itself in and out of the enclosure, quietly, reliably and without the use of toothed-belts or chain-drives. The lack of a mechanical connection between the passerelle and the enclosure ensures that the passerelle will be easily serviced and will prevent structural damage in the event of plank-end contact with a fixed structure.

• Float-Feature that will allow the plank to roll on the dock without hydraulic support. In the event that the plank is pulled off the dock, the plank will lower at a safe metered rate so as not to injure anyone that may happen to be on the plank at the time.

• Rigid Hoop-Rail system, that provides real security when boarding, not the perceived protection afforded by lifelines that are provided with most of our competitor’s passerelles. Our handrail system includes a variety of individual stainless steel telescoping rail sections on ball-joint mounts in varying lengths that allow for a rigid rail section to be installed in-between the passerelle’s car section and the rotating and luffing sections.