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Velocity 45 Twin MAN Diesel Engines. 1992. Australian Hovercraft.
Velocity 45 Twin MAN Diesel Engines. Shown without roof. 1992
Close up of fingers on Hover Drilling Barge Kalgoorlie, Western Australia.
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Designed primarily as a fast ferry
for operations in sheltered waters, the SR.N6 Mk I can accommodate either 38
passengers or 3 tonnes of freight. Fully amphibious, it can operate from
relatively unsophisticated bases above the high water mark, irrespective of
Directional control is achieved by
twin rudders and skirt lift, with a thrust port system to assist in low speed
manoeuvring. Two manually actuated elevators provide pitch trim at cruising
Military variants have
seen service with the Egyptian Navy, Iraqi Navy (type Mk 6C), Iranian Navy and
the Saudi Arabian Frontier Force.
10 Tonne amphibious passenger
Power for the integrated lift /
propulsion system is provided by a Rolls Royce Marine Gnome gas turbine with a
maximum continuous rating at 15 ºC of 900shp. This drives a BHC 12-blade
centrifugal 2.13 m diameter lift fan, and a Dowty Rotol four-blade variable
pitch 2.74 m diameter propeller for propulsion.
Overall Length: 14.80 m
Overall Beam: 7.70 m
Overall Height on landing pads: 3.80 m
Skirt Depth: 1.22 m
Cabin size (l x w): 6.62 m x 2.34 m
Cabin headroom at centre line: 1.83 m
Door aperture size (h x w): 1.75 m x 0.99 m
38 passengers or 3 tonnes of freight.
Normal Gross: 10 tons
(at normal gross weight at 15 ºC)
Average service water speed: 30 - 35 knots
Endurance at maximum continuous power on 265 Imperial Gallons: 3.6 hours
(as at 1990)
SR.N6 Mk 1 to 5: 42
SR.N6 Mk 6: 7
SR.N6 Mk 8: 8
In 1972 a 'stretched' version of the
SR.N6 passenger craft known as the SR.N6 Mk 1S was introduced, increasing the
seating capacity from 38 to 58.
The Mk 1S is 3 metres longer than the
Mk 1 and has additional baggage panniers on the rear sidedecks. To maintain
performance, the rating of the Rolls Royce Gnome gas turbine is increased by
100shp to 1,000shp. Three Mk 1S craft had been built by 1990.
Mk 6 GENERAL PURPOSE
The SR.N6 Mk 6 is the most recent
development in the successful SR.N6 series and represents significant steps
forward in terms of all-weather performance and increased manoeuvrability,
especially in high winds and at low speeds. There is also a significant
reduction in the external noise level.
These advances have been achieved by
the introduction of twin propellers, a more powerful engine and a redesigned
skirt system. The tapered skirt, which is deeper at the bow than the stern,
cushions the effect of operating over larger waves and surface obstacles and
enables the craft to operate in winds up to Beaufort Scale 8 and waves of up to
The cabin is the same size as that on
the SR.N6 Mk 1S.
Originally motive power on the
prototype was supplied by a single 1,125shp Rolls Royce Marine Gnome GN 1301 but
the craft has been modified for hydrographic survey work and is now fitted with
a Gnome GN 1051/1. Two 3.05 m diameter Dowty Rotol variable pitch propellers are
Overall Length: 18.80 m
Overall Beam: 7.92 m
Overall Height on landing pads: 4.00 m
Skirt Depth: 1.50 m
Maximum operating: 17,010kg
(at normal gross weight at 15 ºC)
Description: Air cushion craft for transporting, ship-to-shore and across the beach, personnel, weapons, equipment, and cargo of the assault elements of the Marine Air-Ground Task Force.
Features: The Landing Craft Air Cushion (LCAC) is a high-speed, over-the-beach fully amphibious landing craft, capable of carrying a 60-75 ton payload. It is used to transport the weapons systems, equipment, cargo and personnel of the assault elements of the Marine Air-Ground Task Force from ship to shore and across the beach. LCAC can carry heavy payloads, such as an M-1 tank, at high speeds. The LCAC payload capability and speed combine to significantly increase the ability of the Marine Ground Element to reach the shore. Air cushion technology allows this vehicle to reach more than 70 percent of the world's coastline, while only about 15 percent of that coastline is accessible by conventional landing craft.
Background: Concept Design of the present day LCAC began in the early
1970s with the full-scale Amphibious Assault Landing Craft (AALC) test vehicle.
During the advanced development stage, two prototypes where built.
The first LCAC was delivered to the Navy in 1984 and Initial Operational
Capability (IOC) was achieved in 1986. Approval for full production was granted
in 1987. After an initial 15-craft production competition contract was awarded
to each of two companies, Textron Marine and Land Systems (TMLS) of
LCAC first deployed in 1987 aboard USS Germantown (LSD 42). LCAC are transported in and operate from all amphibious well deck ships including LHA, LHD, LSD and LPD. The craft operates with a crew of five.
In addition to beach landing, LCAC provides personnel transport, evacuation support, lane breaching, mine countermeasure operations, and Marine and Special Warfare equipment delivery.
Program Status: All of the planned 91 craft have been delivered to the Navy. A Service Life Extension Program (SLEP) is currently in progress to add service life to the craft design life of 10 years, delaying the need to replace these versatile craft.
Point of Contact:
Public Affairs Office
Naval Sea Systems Command
Class: LCAC 1
Builder: Textron Marine and Land Systems/Avondale Gulfport Marine
Power Plant: 4- Allied-Signal TF-40B gas turbines (2 for propulsion/2 for lift); 16,000 hp sustained; 2- shrouded reversible pitch airscrews; 4- double-entry fans, centrifugal or mixed flow (lift) / 4 – Vericor Power Systems ETF-40B gas turbines with Full Authority Digital Engine Control (FADEC) (2 for propulsion/2 for lift); 16,000 hp sustained; 2- shrouded reversible pitch airscrews; 4- double-entry fans, centrifugal or mixed flow (lift)
Length: 87 feet 11 inches (26.4 meters)
Beam: 47 feet (14.3 meters)
Displacement: 87.2 tons (88.60 metric tons) light; 170-182 tons (172.73 - 184.92 metric tons) full load
Range: 200 miles at 40 kts with payload / 300 miles at 35 kts with payload
Speed: 40+ knots (46+ mph; 74.08 kph) with full load
Load Capacity: 60 tons / 75 ton overload (54.43/68.04 tonnes)
Military lift: 24 troops or 1 MBT
Armament: 2 - 12.7mm MGs. Gun mounts will support: M-2HB .50 cal machine gun; Mk-19 Mod3 40mm grenade launcher; M-60 machine gun
Radars, Navigation: Marconi LN 66; I band / Sperry Marine Bridge Master E
Date Deployed: 1982
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