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By H. Wittenberg

Plane layout four (2001) seventy nine - eighty

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It was due to fly around 1995 and was powered by two, rear-mounted tractor Propfan engines, the same type as found on the YAK-46. Other types under test include the Antonov AN-70T designed as a military and civilian large STOL transport with a maximum all-up weight of 286,600 pounds (130,000 kg). It made a first flight on 16 December 1994 but its life was short-lived, due to its loss in a mid-air collision with its Antonov AN-22 chase plane on 10 February 1995. The second prototype first flew on 24 April 1997 with a third aircraft built in 1998.

Some could possibly be still flying. However, prior to this loss, the prototype’s first flight was made on 14 December 1979. The five-blade fixed-pitch propeller is powered by a 200/210 BHP Lycoming engine, giving the aircraft a cruise speed of 57–108 knots. Due to the propulsor, it is said to be the world’s quietest aircraft. Present day airships, such as those built by Airship Industries of the UK, have relatively low cruising speeds and are ideally suited to being propelled by the Propulsor type of engine.

Propeller Pitch What is the definition of pitch? And what is the difference between the experimental pitch, the geometric pitch and the advance per rev? The difference will be revealed as each term is considered in turn. The definition of the term ‘pitch’ and its analogy with the common screw must be defined. When a screw is screwed into a solid medium such as wood, it will advance a given distance in each turn equal to its pitch; in other words, its advance per revolution is a fixed quantity equal to its pitch.

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Aircraft performance, theory and practice by H. Wittenberg

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