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Breguet 763 Deux-Ponts

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Deux-Ponts / Provence / Sahara / Universel
Air France Br.763 Deux Ponts
Role Airliner and freighter
Manufacturer Bréguet Aviation
First flight 15 February 1949
Introduction 10 March 1953
Retired 31 March 1971
Primary users Air France
French Air Force
Number built 20

The Bréguet 761/763/765 are a family of 1940s and 1950s French double-deck transport aircraft produced by Bréguet Aviation. The aircraft were normally called the Deux-Ponts (Double-Decker) but it was not an official name.

Design and development

The third Bréguet Br.761S at the 1957 Paris Air Show fitted with the early central fin shape
A Breguet 765 Sahara being restored by the Musée des Ailes Anciennes in Toulouse, France
Bréguet 765 Sahara under restoration.

Bréguet began design work on the Bréguet 761 double-deck airliner even before the end of the Second World War, in 1944. It was decided that a medium-range airliner with seating for over 100 passengers would be built. The design envisaged using readily available engines with the aim of ease of manufacture and an early first-flight date. The design was known as Project 76-1. The aircraft was destined not to be the first French postwar design to fly, an honour which instead fell to the Sud-Est Languedoc, a civilianised Bloch MB161. The prototype Br.761, F-WASK, first flew at Villacoublay on 15 February 1949.[1]

The 761 featured a cantilever wing set at mid-height on the bulky fuselage. The retractable tricycle landing gear featured dual-wheel main units. The empennage had twin fins and rudders and a vestigial central fin.[2] The prototype was powered by four 1,580 hp (1,180 kW) SNECMA 14R-24 radial engines.[3] The Bréguets serving with Air France had up to 107 seats and an elevator between the two floors.[citation needed]

The prototype was followed by three Br.761S pre-production aircraft powered by 2,020 hp (1506 kW) Pratt & Whitney R-2800-B31 radial engines. These were fitted with 12 ft 1½in (3.70 m) diameter Hamilton Standard propellers. The aircraft successfully completed their trials incident-free. Their first flights were in 1951 and 1952.[1]

The French Government ordered 12 production aircraft, the Bréguet 76-3, which was later redesignated Br.763. Six aircraft were to be operated by Air France and the other six by the Ministry of Transport. The 763 had more powerful engines, a 1.20 metres (3 ft 11 in) larger wingspan, strengthened wings and a three-crew flight deck (earlier aircraft had four crew). The 763 first flew on 20 July 1951 and entered service with Air France during autumn 1952.[1]

The Air France aircraft had accommodation for 59 passengers on the top deck, and 48 on the lower deck, although the aircraft was capable of carrying 135 passengers in a high-density layout.[1] During 1964 Air France transferred six Br.763s to the French Air Force. The air force also acquired the three pre-production Br.761S aircraft and four new Br.765 Sahara freighter aircraft with removable cargo doors.

Projects to build versions powered with British engines (for possible United Kingdom buyers) did not come to fruition. The projects would have been the 766 (with the Bristol Hercules radial engine), and the 767 with British turboprop engines.

Operational history

Civil

The prototype Br.761 entered service with Air Algérie in 1952 as a cargo aircraft. It was withdrawn early the next year. Silver City Airways leased a Br.761 for three months in the summer of 1953 for use on the Hamburg - Berlin route. A total of 127 round trips carried 4,000,000 pounds (1,800 t) of freight with up to three round trips being made in a day, each leg taking 52 minutes flight time. It was rumoured that Silver City would purchase three aircraft at £770,000 but this did not materialise into a sale.[1]

The Bréguet Br.763 Provence entered service with Air France on 10 March 1953. The inaugural route was Lyon - Algiers. The type was used on European routes from Paris, mainly to the Mediterranean area, but occasionally to London. Domestic routes included Paris to Lyon, Marseille and Nice.[1]

Six aircraft were used in response to a serious incident at Salat, Algeria where French oil rig engineers were in need of assistance. A total of 60 tonnes of heavy equipment and 200 personnel were moved to and from Algiers in four days.[1]

The introduction of the Sud Aviation Caravelle rendered the Provence obsolete as a passenger aircraft. The Caravelle was faster, more comfortable and had a greater range. In 1958, Bréguet borrowed F-BASQ from Air France for a sales tour to North and South America. This was the aircraft which had force-landed at Pont-Évêque in 1955. The tour covered 25,000 miles (40,000 km), and took in the cities of New York, Washington, D.C. and Miami in the United States, Bogotá in Colombia, Santiago in Chile, Rio de Janeiro and Brasilia in Brazil. The tour failed to generate any orders. In North America, the jet age had begun, while the aircraft had too great a capacity for operators in South America, despite being cheaper on a cost-per-seat to operate than a Douglas DC-4. The Provence was used on fewer and fewer passenger services, being replaced by the Caravelle and Vickers Viscount. Six aircraft were transferred to the Armée de l'Air. Air France converted the six remaining Br.763s into freighters with the name Universel.[4] These remained in service on European freight services until the early 1970s. The final flight was on 31 March 1971 from Heathrow to Paris-Orly. A double-deck AEC Routemaster bus was parked alongside the aircraft to mark the retirement of the Br.763 from service.[1]

Military

Bréguet BR.765 of the French Air Force

In October 1955 an order for 30 Bréguet Br.765 Sahara aircraft for the Armée de l'Air was announced. This order was cancelled by the end of the year, but construction on four aircraft was so far advanced that they were completed. These entered service with 64 Escadre de Transport.[1]

The French Air Force acquired the three pre-production Br.761S aircraft, these and the six Sahara aircraft acquired from Air France provided the French Air Force with a valuable transport fleet for moving personnel and materials to the Pacific nuclear testing areas. The Sahara fleet was retired in 1972.

Accidents and incidents

The Bréguet Deux-Ponts had an excellent safety record.

  • On 10 May 1955, F-BASQ of Air France made a forced landing in a field at Pont-Évêque, Isère following directional control problems in flight. The four crew and 46 passengers were unharmed. The aircraft was repaired on site and flown out from an improvised airstrip a few weeks later.[1]

Variants

Bréguet 761
Prototype with four 1,190 kW (1,590 hp) SNECMA 14R-24 radial engines, one built.
Bréguet 761S
Pre-production aircraft, powered by four 1,600 kW (2,100 hp) Pratt & Whitney R-2800-B31 engines; three built.
Bréguet 763 Provence
Production aircraft for Air France, powered by four 1,800 kW (2,400 hp) Pratt & Whitney R-2800-CA18 engines; 12 built.
Bréguet 764
Proposed anti-submarine naval version, prototype 761 was to be converted but project was abandoned.
Bréguet 765 Sahara
Freighter version for the French Air Force, powered by four 1,900 kW (2,500 hp) Pratt & Whitney R-2800-CB17 engines; four built.

Operators

 France
Air Algérie (loaned for trials in 1952 when Algeria was still a French territory)
French Air Force
Air France
French Navy
 United Kingdom
Silver City (leased 1953)

Specifications (Br.763)

3-view line drawing

Data from Jane's All The World's Aircraft 1953–54[2]

General characteristics

  • Crew: 3
  • Capacity: 107 passengers
  • Length: 28.94 m (94 ft 11 in)
  • Wingspan: 42.96 m (140 ft 11 in)
  • Height: 9.56 m (31 ft 4 in)
  • Wing area: 185.4 m2 (1,996 sq ft)
  • Aspect ratio: 9.95:1
  • Empty weight: 32,535 kg (71,727 lb)
  • Max takeoff weight: 50,000 kg (110,231 lb)
  • Fuel capacity: 15,300 L (4,042 US gal; 3,366 imp gal)
  • Powerplant: 4 × Pratt & Whitney R-2800-CA18 eighteen-cylinder radial engines, 1,800 kW (2,400 hp) each
  • Propellers: 3-bladed Hamilton-Standard, 4.25 m (13 ft 11 in) diameter constant-speed propellers

Performance

  • Cruise speed: 390 km/h (240 mph, 210 kn) at 3,000 m (10,000 ft) (max cruise)
336 km/h (209 mph; 181 kn) at 3,000 m (9,800 ft) (econ. cruise)
  • Range: 2,290 km (1,420 mi, 1,240 nmi)
  • Rate of climb: 5.8 m/s (1,140 ft/min) at sea level
  • Time to altitude: 3,000 m (9,800 ft) in 13 minutes
  • Take-off distance to 15 m (49 ft): 1,260 m (4,134 ft)
  • Landing distance from 15 m (49 ft): 980 m (3,215 ft)

Surviving aircraft

F-BASS at Fontenay-Trésigny

See also

Aircraft of comparable role, configuration, and era

References

Notes

  1. ^ a b c d e f g h i j Hirst, Mike (2009). "Double-Decker Déja-vu". Aeroplane. No. December 2009. pp. 72–76.
  2. ^ a b Bridgman 1953, pp. 128–129.
  3. ^ Stroud Flight 10 April 1953, p. 458.
  4. ^ Stroud, Michael (1971). "World Airliner Census" (PDF). Flight. No. 12 October 1971. p. 648.

Bibliography

  • Bridgman, Leonard (1953). Jane's All The World's Aircraft 1953–54. London: Jane's All The World's Aircraft Publishing Company.
  • Stroud, John. "The Double-Decker Provence". Flight. No. 10 April 1953. pp. 458–461.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.
  • French Post-War Transport Aircraft. Tonbridge, England: Air-Britain. 1980. ISBN 0-85130-078-2.
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