De Havilland Heron - Variants

Variants

• Heron 1: Four-engined light transport aircraft. Fitted with fixed landing gear.
  • Heron 1B: This model had an increased take-off weight of 13,000 lb (5,897 kg).
• Heron 2: Four-engined light transport aircraft. Fitted with retractable landing gear.
  • Heron 2A: This designation was given to a single Heron 2, which was sold to a civil customer in the USA.
  • Heron 2B: This model had the same increased takeoff weight as the Heron 1B.
  • Heron 2C: Redesignation of the Heron 2Bs, which could be fitted with optional fully feathering propellers.
  • Heron 2D: Four-engined light transport aircraft. This model had an increased takeoff weight of 13,500 lb (6,123 kg).
  • Heron 2E: VIP transport aircraft. One custom-built aircraft.
• Heron C.Mk 3: VIP transport version for the Queen's Flight, Royal Air Force (RAF). Two built.
• Heron C.Mk 4: VIP transport aircraft for Queen's Flight, RAF. One built.
• Sea Heron C.Mk 20: Transport and communications aircraft for the Royal Navy. Three ex-civil Heron 2s and two Heron 2Bs were acquired by the Royal Navy in 1961.
• Riley Turbo Skyliner: Re-engined aircraft. A number of Herons were fitted with 290 hp (216 kW) Lycoming IO-540 flat-six piston engines. The modifications were carried out by the Riley Turbostream Corporation of the USA.

• Saunders ST-27: The fuselage was lengthened by 8 ft 6 in (2.59 m), to accommodate up to 23 passengers. It was powered by two 750 shp (559-kW) Pratt & Whitney Canada PT6A-34 turboprop engines. Twelve Herons were modified by the Saunders Aircraft Corporation of Gimli, Manitoba, Canada.
  • ST-27A and ST-27B : The original designations of the ST-28.
  • Saunders ST-28: Improved version of the ST-27. One prototype built.
• Tawron: Conversion by Shin Meiwa of Japan for Toa Airways with 260 hp (194 kW) Continental IO-470s replacing the original engines.