LANDING CRAFT

Robust  |  Strength |  Versatility

Mariah Hovercraft’s ‘Landing Vessel’ is a totally amphibious and versatile vessel that can be used for freight/cargo, rescue or military applications. She is capable of carrying a 40 tonne payload or 80 passengers or combination of both, plus 2/3 crew.

SPECIFICATIONS

Dimensions and Payload

  • Length 26 metres
  • Width 12 metres
  • Height (off cushion) to top of duct 5.7 metres
  • Height (on cushion) to top of duct 6.91 metres
  • Skirt depth 1.8 metres
  • Maximum weight all up includes fuel 68 tons
  • Maximum pay load (heavy) 40 tons
  • Minimum pay load (light) 13 tons
  • Maximum fuel 3.4 tons
  • Maximum water 1 ton
  • Recommended number of crew 2/3
  • Designed passengers 80
  • Maximum passengers (light ship) 100

Operational Limits

  • Recommended maximum wave height for passenger operation – 2.5 metres (+0.5 metres light ship).
  • Maximum wind conditions – 35 knots (close quarters).
  • Maximum Range: 600 Nautical Miles at cruising speed
  • Maximum Speed: 50 knots or better
  • Economic Cruise 35knots
  • Obstacle clearance: 1.2 metres
  • Creeping capability: <6 degrees
  • MAN V10-1550 Series. 1550 HP
  • Onan 30DGGC-L Series AC Generator
  • Fuel consumption at cruise – 295 Litres per hour
  • Fuel consumption at max power – 455 Litres per hour
  • 5 bladed, 3.5 metre diameter Ducted Fans (VPIM) (MT Propellers)
  • Kevlar/carbon reinforced composite construction Lloyds approved
  • Stainless Steel Hubs and Drive Shafts

Lift Fans

  •  2 Stainless blades, stainless steel shaft centrifugal fans, hydraulic driven

Classification

  • GL’s Rules for Classification of Naval Ships
  • British Hovercraft Safety Rules
  • Special Service Craft Rules Hull Construction
  • The hull structure is Kevlar/Carbon composite; strengthened with Kevlar/Carbon PVC foam cored longitudinal and transverse frames.
  • The lower air chamber void is filled with polyurethane foam for additional impact strength and buoyancy.
  • The bottom skin is ridged and curved in to the bow for greater tensile strength, and to reduce wave impact.

Superstructure

  • The superstructure is constructed from E-glass/ Kevlar/Carbon PVC cored panels.
  • Large open well deck to enable the transport of Machinery and or equipment
  • Space for 40 ft std shipping container.
  • The bridge and Crew quarters are located each side of the open well deck. In a narrow structure along the deck, windows are high impact laminated glass, ballistic glass is optional; the bridge fwd windows have wipers and de-icers.
  • A hatch is position aft of the bridge; to access the equipment placed on the superstructure roof and to act as an escape hatch.
  • Bow ramp is manufactured from Core sandwich composite structure. The operation is hydraulic with manual override.
  • The well deck is self draining.

Rudders

  • 4 Rudders Mounted aft on the duct, Constructed from Kevlar/Carbon/PVC cored.

Elevators

  • 2 elevators Kevlar/Carbon/PVC cored mounted in the duct.
  • Computer controlled, with manual override.

Skirt

  • The skirt is “Bag and Finger” type constructed from heavy-duty polyester rip-stop nylon, synthetic rubber coating. Anti plough in feature in the front bag section.
  • The skirt finger sections are changeable on hardstand, without having to jack the vessel.
  • Optional hydraulic rams can be fitted to the hull for jacking purposes.

Engine Installation

  • The main engines are mounted on a Sub-frame for ease of removal for major maintenance. Rubber isolation mountings are incorporated to reduce vibration.
  • The fans are driven by Poly-chain GT kevlar toothed belts.
  • The sub-frame and fan ducts can be removed as a unit or separately.

Ballast/Fuel System

  • 4 fuel tanks are positioned at 4 “corners” of the hull, and are interconnected with a manifold.
  • A high-speed transfer pump can transfer fuel between all tanks to aid trim.
  • Tank heaters are fitted for extreme cold conditions Ballast/Water system.
  • The water tank is positioned centrally.
  • Emergency dump valve fitted.
  • A tank heater is fitted Grey/Black Water Tank.
  • Pump out valve fitted Engine Fire Extinguisher System.
  • CO2 Drench combined with strategically placed Aqueous Film Forming Foam (AFFF) Extinguishers.
  • Command controlled, remote fuel shut off Control Systems.
  • The control systems are a “fly by wire type”.
  • The steering yoke controls the rudders, also fitted to the steering handles are the engine speed controls.
  • A dead man shut off switch is incorporated in the instrument panel in case of emergency.
  • Foot operated clutch for main fans.
  • Computer controlled elevator with manual override.
  • The lift fans speed controls are Electro-hydraulic.

Instrumentation
Each engine has the following gauge and/ or warning lights or audible warnings:

  • Tachometer
  • Oil pressure
  • Oil Temperature
  • Low oil
  • Voltmeter
  • Amp meter
  • High engine temperature
  • Alternator failure
  • Fuel depth
  • Fresh water depth

Electrical Systems

  • All systems duplicated 24V DC / 220V AC. 220VAC generated underway, 24Vbattery backup.
  • 12 KVA Onan Generator
  • 8 multi cell, series-connected batteries
  • 2 X 120 Amp alternators, powered by main engines
  • All duplicated wiring to Lloyds specifications, with appropriate circuit breakers and standard coded wiring Navigation and Communication Equipment.
  • 12” LCD Raymarine Radar, GPS, Remote searchlight, Navigation Lights (USCG Approved)
  • 25/5-Watts Icomm VHF Radio, Silva 150F flush mount magnetic compass
  • Binocular Silva marine 7×50 floating (2 sets) Armament Platform
  • Optional Reinforced roof section of the bridge to allow for the mounting a 50 cal remotely operated machine gun.

Marine Equipment

  • 4 x 25 person Life raft capsules are mounted on each side of the deck of the craft.
  • One anchor windlass and cable locker installed forward, with towing bits.
  • ​Eight-mooring/fender strongpoint around hull
  • Stainless steel, lowerable guardrails and stanchions all round
  • 8 lifting positions, with slings

Sea Trials

  • All sea trials and initial training to be carried out in Westernport bay, Victoria, Australia.
  • Additional training to be carried out in the crafts operational waters

Weight Calculations

  • The craft is fitted with a ballast system that is extremely clever. It determines the craft is level in both planes. Both longitudinal and laterally.
  • It uses a microprocessor to do the calculations, and uses the excess fuel that the craft is carrying as ballast.
  • It will automatically transfer the required amount of fuel ballast, using high volume pumps, to the appropriate area of the craft to maintain the craft’s trim and attitude. This minimizes the need to be careful when loading the craft.
  • The craft has been designed to carry in excess of its own weight in cargo thus making the craft extremely versatile.
  • Based on the current design weight of this craft, when it is full of fuel, a crew of two and ready for deployment it has a draft of 190 mm when settled in the water.
  • When the craft is fully loaded with its maximum payload the craft only has a draft of 320mm.
  • Due to the hull shape design it is an extremely stable platform when in displacement mode.

Inside Amended Equipment

  • The crew’s quarters are equipped with shower, toilet and separate bedrooms.
  • The galley is equipped with refrigerator, cooking appliance and table and seating for 4 persons.

Cost and Payment Structure

  • The cost of the above Hovercraft is to be advised at time of order, the cost of Class Approval and inspections is in addition to the build cost.
  • Lead-time for production of this craft is 14 to 16 months.