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Twin Prop

Twin Otter in flightThe de Havilland Twin Otter was designed in the mid-1960s with two turboprop engines so it could take off and land on a very short runway.

The first Twin Otter had two, 578-horsepower Pratt & Whiney Canada PT6A-20 turboprops each with a three-blade propeller. The 300 series changed to the more powerful Pratt & Whiney Canada PT6A-27, each having 620-horsepower.

The Twin Otter had extraordinary lift ability and could land on very short runways. This was possible due to the craft’s twin engines, the ailerons working together, and the addition of the double slotted trailing edge flaps.

The 200 series of the Twin Otter was developed in 1968, and had an extended nose to improve performance. The 200 series also had more storage space for luggage and cargo in the back of the aircraft. In 1969, further improvements were made, including a more powerful engine that increased the takeoff weight by 450 kilograms, and a larger space inside the aircraft to seat 20 passengers.

The Twin Otter remained in production until 1988.

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