Nord Gerfaut

The Nord Gerfaut (en:Gyrfalcon) was a delta wing experimental research aircraft, originally designed and built by SFECMAS – Société Française d'Étude et de Construction de Matériels Aéronautiques Spéciaux which was later merged with SNCAN – Société Nationale de Constructions Aéronautiques du Nord to form Nord Aviation.[1]

Gerfaut
Role Delta wing research aircraft
National origin France
Manufacturer Nord Aviation
Designer Jean Galtier
First flight 15 January 1954
Number built 3

Development

The Nord 1402 Gerfaut series had their origin in a state-sponsored study into delta and swept wings. To provide data for these studies Arsenal de l'Aéronautique (SFECMAS's nationalised predecessor) designed and built two supersonic gliders; the Arsenal 1301 and Arsenal 2301 with delta and swept surfaces respectively. Towed to the release point by SNCAC Martinet, Douglas DC-3 or SNCASE Languedoc transport aircraft, these gliders provided valuable data for the design of the Gerfaut.[1]

To utilise this data SFECMAS engineers initiated the 1400,1500 and 1910 interceptor projects with delta wings and different propulsion systems. The 1400 developed into the Gerfaut series,the 1500 became the Nord Griffon, while the 1910, ambitiously specified with two large ramjet engines, was never pursued.[1]

Different versions of the Arsenal / SFECMAS 1400 were studied as the:-

  • Arsenal 1401 powered by a combined ramjet / turbojet powerplant and high-set wings.[1]
  • Arsenal 1402 powered by a ramjet with auxiliary Turboméca turbojet, and middle-set wings.[1]
  • Arsenal 1403 powered by a combined ramjet / turbojet powerplant and middle-set wings.[1]
  • Arsenal 1404 powered by a combined ramjet / turbojet powerplant and low-set wings.[1]
  • Arsenal 1405 powered by an ATAR 101 turbojet powerplant and low-set wings.[1]

By the time that construction of prototypes started, the interceptor requirement had overtaken the Gerfaut so the aircraft was designed as a research aircraft.

History

The Nord 1402A Gerfaut first flew on 15 January 1954 as a single-seat single-engined monoplane with thin delta wings and swept vertical tail surfaces and a small high-set delta tailplane. The fuselage was a cylindrical monocoque structure with a nose intake and with the cockpit mounted above it, giving the aircraft its characteristic hump-backed look. It had a retractable tricycle landing gear and was originally powered by an internal 2800 kg (6,173 lb ) thrust ATAR 101C turbojet. On 3 August 1954 it became the first aircraft in Europe to exceed Mach 1 in level flight without afterburners. The second aircraft was the Nord 1402B Gerfaut 1B which had a larger wings and an Atar 101D engine. The third aircraft, the Nord 1405 Gerfaut II, first flown in 1956 was similar but had a refined structure, a clipped delta wing and an ATAR 101F engine. After it had finished test flying the third aircraft was used to test air intercept radars.

Variants
1402A Gerfaut
Delta research aircraft with a 2800kg (6,173lb ) thrust ATAR 101C turbojet, one built.
1402B Gerfaut 1B[2]
Delta research aircraft with larger wing and an ATAR 101D turbojet, one built.
1405 Gerfaut II[3]
Delta research aircraft with refined structure, clipped wing and an ATAR 101F turbojet, one built.

Operator
 France

Specifications (1405 Gerfaut II)

Data from Jane's All the World's Aircraft 1958-59[4]

General characteristics

  • Crew: 1
  • Length: 10.98 m (36 ft 0 in)
  • Wingspan: 6.58 m (21 ft 7 in)
  • Height: 5.67 m (18 ft 7 in)
  • Wing area: 26.2 m2 (282 sq ft)
  • Aspect ratio: 2.16
  • Gross weight: 5,250 kg (11,574 lb)
  • Fuel capacity: 1,400 l (370 US gal; 310 imp gal)
  • Powerplant: 1 × ATAR 101G afterburning turbojet, 34 kN (7,700 lbf) thrust dry, 43 kN (9,700 lbf) with afterburner

Performance

  • Maximum speed: 1,586 km/h (985 mph, 856 kn) approx. at 12,000 m (39,370 ft)
  • Maximum speed: Mach 1.3 at 12,000 m (39,370 ft)
  • Take-off speed: 278 km/h (173 mph; 150 kn)
  • Landing speed: 232 km/h (144 mph; 125 kn)
  • Range: 201 km (125 mi, 109 nmi)
  • Endurance: 50 minutes
  • Service ceiling: 16,000 m (52,000 ft)
  • Rate of climb: 220 m/s (43,000 ft/min)
  • Take-off run: 400 m (1,312 ft)
  • Landing run: 500 m (1,640 ft)
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References
  1. "L'Arsenal de l'aéronautique" (PDF). www.hydroretro.net. 2007-08-18. Retrieved 2011-06-16.
  2. Bridgman, Leonard, ed. (1956). Jane's All the World's Aircraft 1956-57. London: Sampson Low, Marston & Company, Ltd. pp. 147–148.
  3. Bridgman, Leonard, ed. (1956). Jane's All the World's Aircraft 1956-57. London: Sampson Low, Marston & Company, Ltd. p. 148.
  4. Bridgman, Leonard, ed. (1957). Jane's All the World's Aircraft 1958-59. London: Jane's All the World's Aircraft Publishing Co. Ltd. pp. 160–161.

further reading
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