Antarctic snow cruiser

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A cutaway drawing of the Antarctic Snow Cruiser.

The Antarctic Snow Cruiser was a vehicle designed from 1937 to 1939 under the direction of Thomas Poulter, intended to facilitate transport in the Antarctic. On April 29, 1939, Poulter and The Research Foundation of the Armour Institute of Technology showed the plans to officials in Washington, D.C.. The Research Foundation would finance the cost and oversee the construction, and then loan the vehicle to the United States Antarctic Service. Work began on August 8, 1939 and lasted for 11 weeks. On October 24, 1939, the vehicle was fired-up for the first time at the Pullman Company in Gary, Indiana (near Chicago) and began the 1,640 km (1,020 mile) journey to the Boston Army Warf. During the trip, a damaged steering system caused the vehicle to drive off a small bridge and into a stream near Lima, Ohio, where it remained for 3 days. After it arrived in Boston, it departed for Antarctica on November 15, 1939 aboard the ship the North Star.

The Snow Cruiser arrived in Bay of Whales, Little America, Antarctica in early January 1940 and experienced many problems. It was necessary to construct a ramp from timber to unload the vehicle. As the vehicle was unloaded from the ship, one of the wheels broke though the ramp. The crew cheered when Poulter powered the vehicle free from the ramp but the cheers fell silent when the vehicle failed to move through the snow and ice. The large, smooth, tread-less tires were originally designed for a large swamp vehicle; they spun freely and provided very little forward movement, sinking as much a 3 feet into the snow. The crew attached the two spare tires to the front wheels of the vehicle and installed chains on the rear wheels, but were unable to overcome the lack of traction. The crew later found that the tires produced more traction when driven backwards. The longest trek was 92 miles -- driven completely in reverse. On January 24, 1940, Poulter returned to the US, leaving F. Alton Wade in charge of a partial crew. The scientists conducted seismologic experiments, cosmic-ray measurements, and ice core sampling while living in the snow- and timber-covered Snow Cruiser. Funding for the project was canceled as the focus in the United States became World War II.

In the late 1940s, an expedition team found the vehicle and discovered it needed only air in the tires and some servicing to make it operational. In 1958, an international expedition uncovered the snow cruiser using a bulldozer. It was completely covered by several feet of snow but a long bamboo pole mark its position. They were able to dig down to the location of the bottom of the wheels and accurately measure the amount of snowfall since it was abandoned. Inside, the vehicle was exactly as the crew had left it, with papers, magazines, and cigarettes scattered all around. Later expeditions reported no trace of the vehicle. Although there was some unsubstantiated speculation that the (traction-less) Snow Cruiser was taken by the Soviet Union during the Cold War, the vehicle most likely is either at the bottom of the Southern Ocean or buried deep under snow and ice. Antarctic ice is in constant motion and the ice shelf is constantly moving out to sea. In the mid-1960s, a large chunk of the Ross Ice Shelf broke off and drifted away; the break occurred right through Little America. It is unknown on which side of the ice shelf the Snow Cruiser was located.

1 Specifications
- 1.1 Powertrain Specifications
2 Innovative Features
3 External Links
4 See Also

[edit] Specifications

Length: 17.0 meters (55 feet 8 inches)
Width: 6.06 meters (19 feet 10.5 inches)
Height (wheels retracted): 3.7 meters (12 feet)
Height (wheels extended): 4.9 meters (16 feet)
Fully-loaded Weight: 34,000 kg (75,000 pounds)
Range: 5,000 miles
Maximum Speed: 48 km/hour (30 miles/hour)
Self-Sufficiency: 1 year under the most extreme conditions
Fuel Capacity: 9,463 liters (2,500 US gallons) stored under the floor
Additional Fuel Capacity: 3,785 liters (1,000 US gallons) stored on the roof, to be used by the plane
Crew Size: 5 people
Estimated Final Cost: $300,000
Cabin Compartments: control cabin, machine shop, combination kitchen/darkroom, storage for fuel, food, two spare tires

[edit] Powertrain Specifications

Powertrain Configuration: Diesel-Electric Hybrid (2 diesel engines, 2 generators, 4 electric motors)
Diesel Engine Model: Cummins H-6 engine
Diesel Engine Power Rating: 112 kW (150 horsepower) @ 1800 rpm -- 224 kW (300 horsepower) total combined power for 2 engines
Diesel Engine Configuration: 6-cylinder inline; naturally aspirated
Diesel Engine Displacement: 11.0 liters (672 cubic inches)
Diesel Engine Bore and Stroke: 124 mm (4 7/8 inch) bore x 152 mm (6 inch) stroke
Electric Generator Manufacturer: General Electric
Electric Drive Motor Manufacturer: General Electric
Electric Drive Motor Power Rating: 56 kW (75 horsepower) -- 224 kW (300 horsepower) total combined power for 4 motors
Tire Manufacturer: Goodyear Tire and Rubber Company
Tire Dimensions: 3048 mm (120 inch) outer diameter x 1676 mm (66 inch) inner diameter x 851 mm (33.5 inch) width

[edit] Innovative Features

Wheels and tires retracted into housings where they were heated by engine exhaust gases. This was to prevent low-temperature cracking of the natural rubber compound.
Long front and rear overhangs on the body were to assist with crossing crevasses up to 15 feet wide. The front wheels were be retracted so the front could be pushed across the crevasse. The front wheels were then to be be extended (and the rear wheels retracted) to pull the vehicle the rest of the way across. This process required a complicated, 20-step procedure.
A pad on top of the vehicle was designed to hold a small airplane (a 5-passenger Beechcraft biplane.) A winch would pull the aircraft into place. The plane was to be used to conduct aerial surveys.
Engine coolant circulated through the entire cabin for heating. The heating system was very efficient and the crew reported that they needed only light blankets when sleeping.
Excess electrical power could be stored in batteries for running lights and equipment when the engine was not running.
The Diesel-Electric drive train allowed for smaller engines and more space for the crew, due to the elimination of large mechanical drive components throughout the vehicle. This is possibly the first application of a diesel-electric powertrain in a 4-wheeled vehicle of this size; this design is now common in large modern mining trucks.