was reading about two new 'high tech' toys in the US Army and US Navy ' tickle trunks' .. USS Spearhead is the Army's baby [ technically the TSV-1X ] and the Navy's HSV-X1 the USS Joint Venture..

originally, the Spearhead was a Tasmanian built car ferry but has been dubbed the Theatre Support Vessel- One Experimental -320 feet catarmaran that can move large numbers of troops into decerpit or non-existent substandard ports in third world miserable sh*tholes..the ship can slip in to shallow harbours where the docks may be ablaze and local stevedores are three days into a khat binge....

plush surroundings and onboard amenities from its days as a civvie ship still on board [ its leased afterall..] make for an interesting troop delivery system,..

they both got combat experience betwen January and July in the Gulf[ last year ]..The Army ship hauled missile batteries and bombs and hundreds of troops to Iraq.. while the Navy version put Navy Seals offshore for a commando raid on oil terminals during the opening hours of Op Iraqi Freedom..

Seems this use of fast catarmaran ships was one of Rumsfeld's better ideas...

top speed 48 knots makes em run rings around the rest of the fleet..

downside is they're made of aluminum and therefore a little light in the shell/torpedo stopping capability...hey, you can't have everything...

Not too different from the Navys LCAC.
***********************************************
***********************************************
The United States Navy

Landing Craft, Air Cushioned



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.

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 New Orleans, La., and Avondale Gulfport Marine, TMLS was selected to build the remaining craft. A total of ninety-one LCAC have now been built. The final craft, LCAC 91, was delivered to the U.S. Navy in 2001. This craft served as the basis for the Navy’s LCAC Service Life Extension Program (SLEP). To date three operational craft have been delivered to the Navy in the SLEP configuration.

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.

General Characteristics
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
Crew: Five
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, Navugation: Marconi LN 66; I band / Sperry Marine Bridge Master E
Date Deployed: 1982
***********************************************
***********************************************
None of these vessels are designed to go toe to toe with enemy forces.Supply,low intensity conflicts,secured sea lanes.Nothing is perfect but the catamarans and the LCAC's get the job done.
A lot nicer traveling on the catamarans than the LCAC's though.