Peanut Scale Airplanes

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Aircraft manufacturers, for about four decades, has tried to design the elusive DC-3 replacement with different types of engines, including piston engine Convair 240/340/440 and Martin 2-0-2 / 4 -0-4 series and the turboprop Vickers Viscount, Fokker F.27 Friendship, and Hawker Siddeley HS.748. The last attempt had been made by the British aircraft industry when two de Havilland and Hawker Siddeley had conducted market research and made designs for a small capacity short range aircraft powered by jet engines in 1959 pure 1960.

Of the two, de Havilland, with its previous Fast, Dove and Heron pistonliners had considerable experience of regional aircraft and developed the first pure jet airliner in the form of quad motor DH.106 Comet. An initial study for a replacement of the DC-3, designated the DH.123, was marked by a length of 60.6 meters across, a size 81.3 feet, two turboprops of 1150 shp Gnon attached to high wing, and a maximum of 22,100 pounds take off. Thus configured, it would have received between 32 and 40 passengers, slightly more than the DC-3 Level 21 to 28.

De Havilland, later taken over by Hawker Siddeley, and renamed the de Havilland Division, had stopped work on the design strength DH.123 because he had participated so closely with Hawker Siddeley Avro own Rolls Royce Dart Power 748 which was placed 44. However, the existing turboprop competition, coupled with the belief that pure technology Havilland jet attracting considerable attraction for passengers, has led to the proposal in mid-1960 DH.126 design, which had the configuration later, standard Most of the small capacity, short-range twin-jets such as SE.210 Caravelle, BAC-111 and DC-9, with swept wings, rear-mounted engines, and t spin. Powered by two 3,860 pounds of thrust PS92 Havilland jet engines, it had been marked by a length of 60.3 meters for the accommodation of 30 passengers and a wingspan of 62 feet.

Several iterations were introduced gradually, although the major thrust moderate, and increases the gross weight in 1964, but implementation was hampered by four fundamental constraints:

1. Great availability of pure jet engine.
2. Stopping the engine development of several promising due mid-1960 British engine manufacturer mergers.
3. Higher costs at the seat-mile on the DC-3-sectors like the new design which had been expected.
4. The inability to exploit the speed of a pure jet aircraft on relatively short sectors.

Hawker Siddeley turboprop considering that was only the intermediate technology stage, has also launched a program designed airliner pure jet along its own before the merger de Havilland, though its lower wing at the rear of engine, T-tail configuration was much like his former rival.

Try to minimize development costs by using the cockpit, forward fuselage, systems, and the cab of his own Avro 748, she proposed HS.131 in 1964, which was marked similar lengths 62.8 feet overall and a 67-foot wingspan that Havilland DH.126 comparable, but its estimates of 5,000 pounds of thrust Rolls Royce RB.172 allowed him to offer a higher, the gross weight of 30,000 pounds and a capacity of 32 passengers.

Before, like de Havilland, with engine and inability unavailability, Hawker Siddeley design iterations planned round powertrains. A radical change of configuration, presented by the HS.136 1967, for example, resulted in a low-wing aircraft powered by two 9730 pounds thrust Rolls Royce Trent engines with a conventional tail accom.