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Two Engines in Cross-country Tractor
Page 91
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A FOUR WHEEL DRIVE cross:A country vehicle embodying a number of unusual design features, has been built by Nicholas Straussler and Co., Ltd., 5 Clargcs Street, Piccadilly, London, W.I. Two engines are mounted transversely well forward of the front axle. The specification provides for two petrol engines of a total b.h.p. up to 180, or two oil engines totalling 120 b.h.p.
Power is transmitted to a special four-plate clutch and five-speed gearbox by bevel gearing. There is also a twospeed transfer box, so that 10 forward speeds are available. Front-wheel drive is optional according to operating conditions. Either one or two engines can be used as required.
As the power units and the electrical equipment are duplicated and can be used separately, there should be little likelihood of complete breakdown from these sources.
Not the least interesting feature is the tyre equipment, which consists of four Straussler-Lypsoid tyres with special treads. They are 44 in. in diameter by 28 in. wide. Although they have the appearance of solids, they carry a pressure of 10-15 p.s.i.
These tyres are claimed to provide traction equal to that of a track with a unit ground pressure of 4.5 p.s.i. with a gross vehicle weight of 6 tons. In effect, they act as soft springs of great amplitude adding about 6 in. to the normal spring range. Steering is said to be exceptionally light, because the tyres roll on the deep treads instead of scrubbing. For military purposes the vehicle is rated as a 2-tonner and for civilian use as a 5-tonner. The wheelbase is 8 ft. 6 in., overall length 16 ft. 3 in. and ground clearance amidships is 1 ft. 6 in. Maximum speed is quoted as 50 m.p.h.