In 1945 SNCASE designed a "stratospheric" transport for transatlantic postal work designated the SE-1000. The design was not built, but after the nose section was modified, it was built as high-altitude photo-survey aircraft for the Institut Géographique National, and re-designated the SE-1010.^[1] If it was decided not to use it as a survey aircraft, it was proposed to produce it as a 14-passenger transport instead.^[1]

The SE-1010 was a sleek, four-engined, mid-wing monoplane powered by four Gnome-Rhône 14R 14-cylinder two-row air-cooled radial engines. The prototype SE-1010, with French test registration F-WEEE, first flew on 24 November 1948.^[1] On 1 October 1949 the prototype entered a flat-spin during test flying from Mariganne and crashed, killing the six person crew near Carcès. The project was canceled and the three aircraft being built were not completed.^[1]

SE-1000

Proposed four-engined stratospheric transatlantic postal aircraft, not built.^[1]

SE-1010

High-altitude photo-survey aircraft, one built.^[1]

SE-1011

Production aircraft: three under construction when project was abandoned.

SE-1015

Long-range 18-seat courier airliner'

SE-1020

Maritime patrol aircraft with Jumo 213 engines and gun turrets.

SE-1030

Proposed 40-passenger airliner variant, not built.^[1]

SE-1035

Proposed airliner variant, not built.

SE-1040

Proposed turboprop test-bed to evaluate the Rolls-Royce Dart engine.

Data from French Postwar Transport Aircraft,^[1] Jane's all the World's Aircraft 1947^[2]

General characteristics

• Crew: 4
• Capacity: 14 pax, 4 pax with freight hold, 8 pax with freight hold, or 0 pax with 26.5 m³ (940 cu ft) freight hold
• Length: 21.81 m (71 ft 7 in)
• Wingspan: 31 m (101 ft 8 in)
• Height: 5.2 m (17 ft 1 in)
• Wing area: 116.3 m² (1,252 sq ft)
• Empty weight: 14,000 kg (30,865 lb)
• Gross weight: 25,000 kg (55,116 lb) -27,000 kg (60,000 lb) (photographic aircraft)
• Gross weight passenger version: 33,000 kg (73,000 lb)
• Fuel capacity: 16,040 L (4,240 US gal; 3,530 imp gal) fuel;380 L (100 US gal; 84 imp gal) oil
• Powerplant: 2 × Gnome-Rhône 14R-28 14-cylinder two-row air-cooled radial engine, 1,200 kW (1,600 hp) each for take-off; LH rotation fitted to starboard
• Powerplant: 2 × Gnome-Rhône 14R-29 14-cylinder two-row air-cooled radial engine, 1,200 kW (1,600 hp) each for take-off; RH rotation fitted to port
• Propellers: 3-bladed Ratier, 3.8 m (12 ft 6 in) diameter constant-speed propellers

Performance

• Maximum speed: 635 km/h (395 mph, 343 kn) at 8,000 m (26,000 ft)
• Cruise speed: 540 km/h (340 mph, 290 kn) at 8,000 m (26,000 ft)
• Range: 7,300 km (4,500 mi, 3,900 nmi) no headwind
• Time to altitude: 8,000 m (26,000 ft) in 36 minutes; 9,000 m (30,000 ft) in 46 minutes
• Wing loading: 283 kg/m² (58 lb/sq ft) at 33,000 kg (73,000 lb)
• Power/mass: 6.84 kg/kW (11.3 lb/hp) at 33,000 kg (73,000 lb)

• Chillon, Jacques; Dubois, Jean-Pierre & Wegg, John (1980). French Post-War Transport Aircraft. Tonbridge, UK: Air-Britain. ISBN 0-85130-078-2.
• Mesnard, Joël (2018). "Tragique: The Sud-Est SE.1010". The Aviation Historian (25): 90–99. ISSN 2051-1930.