De Havilland DH.114 Heron

  • CountryUnited Kingdom
  • Type14 seat commuter airliner
  • PowerplantsSeries 2 - Four 185kW (250hp) de Havilland (later Bristol Siddeley) Gipsy Queen 30 Mk 2 six cylinder inline piston engines driving two blade de Havilland constant speed propellers. Series 2E/A1 - Four 215kW (290hp) Lycoming IO540B1A5 flat six piston engines driving three blade constant speed props.
  • PerformanceSeries 2 - Cruising speed 307km/h (166kt), economical cruising speed 295km/h (160kt). Initial rate of climb 1075ft/min. Service ceiling 17,200ft. Range with max fuel and reserves 2873km (1550nm).
  • WeightsEmpty 3848kg (8484lb), max takeoff 6124kg (13,500lb).
  • DimentionsWing span 21.80m (71ft 6in), length 14.80m (48ft 6in), height 4.75m (15ft 7in). Wing area 46.4m2 (499sq ft).
  • CapacityFlightcrew of two. Typical main cabin seating for 14 at two abreast with a central aisle. Alternative seating for 15 or 17. Executive versions with seating for eight.
  • Production149 Herons built comprising 51 Series 1s and 98 Series 2. Conversions include 28 Riley Herons, six by Tawron, 29 by Prinair and 13 Saunders ST27s. A handful remain in commercial service.

The Dh.114 Heron is an extended, four engined improvement of de Havilland's fruitful Dh.104 Dove.

Just a couple of years after the fact being developed than the Dove on which it was based, configuration chip away at the Heron started in the late 1940s, ensuing in the model's first flight on May 10 1950 (the Dove first flew in 1945). In planning the Heron, de Havilland made however much utilization of Dove componentry as could be expected, thus both sorts offer the different somewhat raised cockpit and separate fundamental lodge and metal development. Beginning Heron creation flying machine likewise offered settled undercarriage (not at all like the retractable apparatus Dove). Significant contrasts incorporate the four 185kw (250hp) Gipsy Queen motors (instead of two 255 to 300kw/340 to 400hp Gipsy Queen 70s), more noteworthy compass wings, a more drawn out and taller fuselage and more noteworthy seating limit. The primary Series 1 generation Herons were conveyed to New Zealand National Airways in 1952.

Additionally in 1952 the first Series 2 Heron first flew on December 14. The 2's fundamental change over the 1 was retractable undercarriage, which for a weight punishment of 75kg (165lb) expanded cruising speed by 32km/h (17kt), while other standard and discretionary upgrades were minor in nature. The Heron 2a was certificated for utilization in the USA, and a proportionate 2b official adaptation was additionally advertised. The 2c and comparable official 2d have more prominent weights.

The Heron has been the subject of various transformation programs. In the USA Riley changed over 20 to be fueled by Lycoming Io540s (eight more were changed over in Australia), while Prinair changed over a further 29 to Lycoming force.

The most goal-oriented Heron changes were performed by Saunders, whose St27 transformations emphasize two Pratt & Whitney Canada Pt6 turboprops and an extended fuselage. What's more, Tawron changed over six Series 1 Herons with Continental motors.

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