The vessel requires a crew of two persons for its operation. The cargo deck is fitted with cargo tiedownhooks. There are two headlights located at the front of the vehicle and one stern light. The vehicle has engine and driveline hatches. Manual bilge pumps are incorporated for use if the hydraulic bilge pumps fail. Four 24 by 29 tires with a 16-ply rating are used to support the vehicle. On soft or hard terrain, deflate the bow tires to 18 psi and the stern tires to 25 psi. For snow or mud, deflate the bow tires to 12 psi and the stern tires to 20 psi. Four dry-charged, 12-volt, 100-ampere-hour batteries are used. The diesel fuel tanks have a total capacity of 360 gallons.

Machinery and Propulsion

The engine is an industrial diesel engine of 300 gross horsepower at 3,000 rpm. For water propulsion, a 4-bladed propeller with Kort nozzle is used. The lighter is capable of traveling at a maximum speed of 30 mph on land and 9.5 mph in the water. The high range operating radius with no load on land is 200 miles and is 120 miles in water. Speed loss due to wave action is to be expected and is different only in degree between the amphibian and a vessel of similar dimensions.

Maneuvering and Control

The power steering system on the amphibious lighter will permit relatively easy steering. Basically, the steering on land is accomplished by full hydraulic power and in water by the wheels and the rudder. The type of terrain (sand, mud, or hard roads)

will affect land steering as with any automotive vehicle, under ideal conditions such as hard smooth surfaces the outside turning radius is 55 feet. The turning radius will increase as the terrain becomes softer. The lighter is capable of being steered if the hydraulic power should be lost but much more steering effort will be required; in water the steering wheel will turn the wheels and the rudder at all times. The amphibious lighter is capable of going up extremely steep grades as high as 40 percent. The vehicles have an angle of approach of 22 degrees and an angle of departure of 30 degrees. The LARC XV can negotiate 12-foot surf.

Mission Support

The aluminum amphibious lighter is used to carry cargo from an offshore supply ship to a beach for advanced base supply with a total cargo capacity of 30,000 pounds. It also serves as a dive boat or power supply for underwater work. It also can be used for moving personnel and equipment across both land and water from a base to a construction site. Bollard pull in water is 7,700 pounds.

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