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Custom Crane-Trolley Boat-Launching System - Palm Beach

The task defined:   Move the heirloom-quality '60's vintage 9-m/30-ft Riva Aquarama Boat from the boathouse to the water.  Quickly. Safely.  Reliably.  Nautical Structures working with the infrastructure left from a previous boat-launching system, designed a new system using all of the current technology and standards we currently use in the production of our large-yacht equipment.  The Riva Aquarama is stored safely and dry inside a large boathouse on the property.  A concrete pier extends from the boathouse a short distance over land and then 30m/100-ft into the Intercoastal Waterway.  Nautical Structures developed a large-capacity Traveling-Trolley that transports the Riva from the boathouse down the pier to any desired launching-point.  The Traveling-Trolley takes its self-propelled transport design from the drive-system Nautical Structures has developed to deploy and stow our pocketing passerelles.  Using reliable hydraulic motors to drive the axles, the Traveling-Trolley easily transports the almost four-tons of boat weight down the pier.  Bumpers on both ends of the trolley can sense contact with any object on the pier, instantly stopping the movement of the trolley until the obstacle is removed. 

A EZ8000KBEX Knuckle Boom Crane is installed on a large poured-concrete foundation which was engineered to support the entire moment-capacity of the crane system with a significant factor of safety.  The dock-crane is built to handle an antique 9m/30-ft Riva Aquarama.  The crane has a 3640-Kg/8000-Lb Safe Working Load capacity at its full 9.1m/30-ft outreach, and can articulate the two boom sections while under load.  The Knuckle-Boom Crane is constructed primarily from aluminum alloy for reduced weight and enhanced corrosion resistance.  A Nautical Structures' non-fouling Hydraulic Linear Winch system is built into the telescoping boom extension, moving with the telescoping-boom.  The non-fouling Linear Winch is rigged with AmSteel composite-fiber line and is terminated with a stainless steel headache-ball and latching-hook.  The crane is operated with a wireless proportional controller interfaced with high-quality Sauer-Danfoss proportional valves.  These valves have a Manual back-up feature, and are located under a hinged, latched cover in the crane.  The Knuckle-Boom Crane is powered by a 15-kW/20-Hp hydraulic power unit which was custom-built to mount in the subfloor in the boathouse.  The motor is started with a variable frequency drive, and the entire power unit is mounted on soft-mounts to reduce noise.  A variable-displacement, load-sensing pump is used to most efficiently utilize as much or as little energy necessary to power a given function. 

Custom Knuckle-Boom Dock Crane, Ft. Lauderdale

Nautical Structures built a specialized EZ4500KB Dock-Crane for a residence in Ft. Lauderdale.  The client keeps a variety of small boats and personal watercraft in his garage, adjacent to the property's seawall.  A large concrete foundation was poured behind the seawall, engineered to support the full moment-load of the knuckle-boom crane with a significant factor of safety.  The crane, constructed primarily from aluminum alloy has a 2045-Kg/4500-Lb Safe Working Load capacity at its full 8.5m/28-ft outreach.  The Knuckle-Boom design was selected due to its flexibility to handle multiple boat types and work within a large service area.  The crane is powered with a 12-kW/15-Hp hydraulic power unit, soft-mounted and fit with a protective/decorative housing.  The entire boat-handling crane system is painted with AwlGRIP marine paint in a high-gloss custom white color.

"Straddle-Lift" Hydraulic Boat Lift System

Nautical Structures working in cooperation with Davit Master Corporation designed and manufactures a hydraulic four-point-hoist boat lift system.  What makes this lift system truly unique is the use of Hydraulic Linear Winch technology.  This is a winch-technology pioneered by Nautical Structures for the luxury yacht industry almost twenty years ago.  In the residential-lift industry this technology is up until now unknown.  The benefit of Hydraulic Linear Winch technology is the self-limiting, non-fouling features.  In a residential boat-lift application this means that it is not possible to draw in too much cable, or payout too much cable.  And should one corner or side of the lift touch the seabed before the other side, the resultant slacking of the cable will not cause the cable to foul or nest.  The Linear Winch will lift the boat as fast or slow as individually desired.  because there are no gearbox/gear-ratios involved in the winch, there is very little to limit the operational speed of the lift.  The hoisting speed is a simple horse-power calculation. 

A single winch-cylinder on each side of the lift powers two hoisting cables in perfect synchronization.  The two sides of the lift are synchronized with a hydraulic flow-divider to ensure that the lift-carriage comes up and lowers evenly.  In the event of a hydraulic power failure the boat may still be lowered manually by releasing the locking feature of the counter-balance lock valves built into each winch cylinder.  Because the linear winch system does not utilize gears to drive the system it is inherently quiet.  During operation the only operational noise comes from the remotely-mounted hydraulic power unit. 

The upper structure is fabricated from aluminum alloy, and painted in a marine paint in a color of the homeowner's choice. The lower cradle-structure is also typically fabricated from aluminum extrusion.  An upgrade to 316-L stainless steel structure is available upon request.  The finished product is a sleek, compact and inherently safe-operating boat lift system.  Power to Lift - Quality to Last.

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