WORLD WAR II AIRCRAFT - INFO

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  WORLD WAR II AIRCRAFT WHEN WORLD WAR II began in 1999, air forces had already replaced most of their fabric skinned biplanes with all metal, stressed-skin monoplanes Aireraft played a far greater role in military operations during World War II than ever before, The wide range of sireraft duties, and the introduction of radar tracking and guidance systems, put pressure on designers to improve aircraft performance. The main areas of improvement were speed, range, and engine power. Bombers became larger and more powerful - converting from two to four engines in order to carry a heavier bomb load: the US B 17 Flying Fortress could carry up to 6,2 tonnes (6,1 tons) of bombs ver a distance of about 3,200 km 2.000 miles), Some aircraft increased their range by using drop tanks (fuel tanks that were jettisoned when empty to reduce drag). Fighters needed speed and manoeuvrability: the Hawker Tempest shown here had a maximum speed of 700 kph (36 mph), and was one of the few Allied aircra...
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MOTORCYCLE ENGINES - INFO

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          MOTORCYCLE ENGINES




MOTORCYCLE ENGINES must be light weight and compact, and have a good power output. They have between one and six cylinders, can be cooled by air or water, and the capacity of the combustion chamber varies from 49cc (cubic centimetres) to 1500cc. Two types of internal combustion engine are common: the four-stroke, which is used in cars (see pp. 342-343), and the two-stroke. A basic two-stroke engine has only three moving parts - the crankshaft, the connecting rod, and the piston - but the power output is high. 


The engine fires every two strokes (rather than every four), giving a "power stroke" every revolution (see p. 343). Power is conveyed from the engine to the rear wheel by the transmission system. This usually consists of a clutch, a gearbox, and a final drive system. Clutches are multiplate devices, which run in oil. Gearboxes have five or six speeds and are operated by foot pedal. Shaft and belt drive systems are used in some cases, but chain drive to the rear wheel is most common.

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  WORLD WAR II AIRCRAFT WHEN WORLD WAR II began in 1999, air forces had already replaced most of their fabric skinned biplanes with all metal, stressed-skin monoplanes Aireraft played a far greater role in military operations during World War II than ever before, The wide range of sireraft duties, and the introduction of radar tracking and guidance systems, put pressure on designers to improve aircraft performance. The main areas of improvement were speed, range, and engine power. Bombers became larger and more powerful - converting from two to four engines in order to carry a heavier bomb load: the US B 17 Flying Fortress could carry up to 6,2 tonnes (6,1 tons) of bombs ver a distance of about 3,200 km 2.000 miles), Some aircraft increased their range by using drop tanks (fuel tanks that were jettisoned when empty to reduce drag). Fighters needed speed and manoeuvrability: the Hawker Tempest shown here had a maximum speed of 700 kph (36 mph), and was one of the few Allied aircra...
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