A model of a 45,000-pound ice cruiser with an amazing change of pace, which scientists believe will enable them really to get somewhere in the Antarctic was unveiled today by the men who designed it for the Government’s forthcoming: South Pole expedition. Dr. Thomas C. Poulter, scientific director of the research foundation of Armour Institute of Technology who will be among those making the trip to the bottom of the world, said he considered the $150,000 cruiser the most practical and efficient means of polar exploration. PLANE ON BACK Carrying four scientists within and airplane on its back, measuring 55 feet in length and 15 feet tall, with four 10-foot rubber tires, each weighing 1,500 pounds, the cruiser, as modeled resembles a cross between an overland bus and a tank. Streamlined within conservative bounds, the unit can be manipulated at will now crawling like an alligator on its sleek belly now poised for a lunge over a crevasse, then pivoting sharply and gracefully as a polo pony. Through Dr. Poulter’s inventiveness it will be possible to elevate or lower the cruiser’s cabin, turn corners virtually in its own length, move laterally at an angle, climb Polar mountains and travel through storms, all in normal stride. On the top deck the plane can be prepared for flight in 10 minutes. YEAR’S PROVISIONS Members of the foundation staff explained that the full weight of the craft, with all necessary supplies and equipment and the personnel, would be 75,000 pounds. This enormous bulk will have a cruising range of 5,000 miles and a speed of from 10 to 30 miles an hour. It will be driven by two Diesel electric units, and the combined horsepower will be 240. Intended to serve as a mobile base of operations, the cruiser will be divided into six compartments -- control room, engine room, living quarters, galley, store room and a complete machine shop, A year’s provisions for the men and fuel for 5,000 miles will be carried.