SNCASE (abbreviated from Société nationale des constructions aéronautiques du Sud-Est) or Sud-Est was a French aircraft manufacturer. The company was formed on February 1, 1937 by the nationalization and merger of Lioré et Olivier, Potez, CAMS, Romano and SPCA (source: Wikipedia).
Here is a list of all known SNCASE models and designs. I have listed them by numerical order, not chronologically. More detail and updates will be added in the future. Feel free to add to it or correct any mistake!
SE 20 AQUILON (license-built De Havilland Sea Venom)
SE 100 three-engined three-seater attack (former Liore et Olivier LeO 50)
SE 101 version of the SE 100 with different engines.
X-101 jet fighter seaplane project
X-102
X-104 long-range transatlantic flying boat project (9 tons of cargo + 70 passengers)
X-105
X-106 supersonic interceptor project for Switzerland
X-107 supersonic interceptor project for Switzerland
X-108 mixed-power research aircraft project
X-109 single-jet interceptor flying wing project
SE 112
X-114 twin-jet delta wing interceptor project
X-115 tilt-jet interceptor project
SE 116 VOLTIGEUR twin-engined three-seat observation aircraft
SE 117 VOLTIGEUR as redesignated on delivery
SE 118 DIPLOMATE version of the SE 116 for eight to ten passengers
X-121
SE 161 LANGUEDOC forty-seat transport (started as the Bloch MB-161)
SE 200 ROCHAMBEAU giant 200-ton transatlantic flying-boat (former LeO H-49
Amphitrite)
SE 200C SE-104 derivative with a MTOW of 120 tons and HS 24Z or Gnome & Rhône 28T engines
X-200 no details
X-201 200-ton, 18-engine transport flying wing project derived from the X-200 (see SE 2500) (also fighter seaplane project??)
X-202 trijet flying wing mailplane project for North Atlantic service
X-203 trijet 40-passenger flying wing project
X-204 twin-jet 30-passenger medium haul aircraft project
X-205 trijet 30-passenger medium haul airliner project
X-206 series of four-engine medium haul airliner projects
X-207 series of projects leading to the Durandal
X-209 four-seat tailless training and touring jet aircraft project
X-210 series of airliner projects leading to the Caravelle
SE 210 CARAVELLE I
X-212 DURANDAL I
SE 212C DURANDAL II
SE 216 FONCEUR
X-218 tactical support delta wing design derived from Durandal
X-220 Super Caravelle project
X-222 supersonic delta wing interceptor derived from Durandal
X-223 supersonic delta wing bomber derived from Durandal
X-224 supersonic delta wing bomber derived from Durandal
X-250 airliner project powered by three Rolls-Royce/Snecma M45 jet engines
SE 300 light transport autogyro project
SE 400 three-seat military floatplane (derived from LeO H-46)
SE 500 twin-engine twelve-passenger transport project
SE 520 projected version of Dewoitine D.520
SE 530 MISTRAL license-built De Havilland VAMPIRE (4 prototypes - 1951)
SE 532 MISTRAL license-built De Havilland VAMPIRE with Nene 102B engine (94 built)
SE 535 MISTRAL license-built De Havilland VAMPIRE with Nene 104 engine and ejector seat (150 built)
SE 580 post-war fighter derived from D.520 with dorsal air intake
SE 581 variant of above
SE 582 variant of above
SE 600 single-engined armed reconnaissance two-seater project
SE 700 heavy six-passenger transport autogyro
SE 700A projected version of above
SE 701 redesignation of SE 700A
SE 800 four-engine transport project
SE 1000 80-passenger stratospheric transport study
SE 1001 project that led to the SE 1010
SE 1010 photo-recce aircraft derived from SE 1000 for I.G.N. (French National Geographic Institute)
SE 1011 projected long-range mail carrier variant of above
SE 1015 projected variant of above
SE 1020 stratospheric bomber project derived from SE 1010
SE 1100 alternate designation of SE 200C
SE 1200 huge 120/125-passenger flying boat project
SE 1210 sub-scale flying mockup of above
SE 1300 possibly allocated to a flying boat project
SE 1400 projected sub-scale flying mockup of SE 2400 (or heavy jet fighter derived from SE 2400?)
SE 1410 projected sub-scale flying mockup of SE 2400
SE 1500 unguided, effect of explosions, 10 to 200 m from the vehicle (1946)
SE 1501 unguided target (1948)
SE 1502 unguided target (1950)
SE 1502M Navy recoverable target (1953)
SE 1503 turbojet powered (1953)
SE 1510 guided and recoverable (1948)
SE 1511 test of optical guidance (1952)
SE 1521 experimental flying bomb (1949)
SE 1520 built but not flown; five were modified into SE 1502M and five more into SE 1523
SE 1522 recoverable target (1952)
SE 1523 Navy operational recoverable target (1953)
SE 1524 Air Force operational recoverable target (1953)
SE 1530 built and not flown; seven were modified into SE 1522 and two into SE 1523.
SE 1531 rocket powered variant (1952)
SE 1800 experimental twin-jet transport flying wing project
SE 1801 flying wing project derived from the SE 1800
SE 1802 flying wing project derived from the SE 1800
SE 1900 rocket-powered wheeled cart
SE 1910 record-breaking variant of above
SE 2000 four-engine transatlantic heavy bomber project
SE 2010 ARMAGNAC 84/100-passenger transport
SE 2020 version of SE 2010 with bigger wheels (1,72 m instead of 1,52 m), project
SE 2030 version of SE 2010 with four Turbo Cyclone engines
SE 2040 projected derivative of the ARMAGNAC with four Allison T40 turboprop engines and longer fuselage
SE 2060 test bed aircraft of SE 2010 transport aircraft with eight ATAR engines
SE 2100 single-engine two-seater private flying wing
SE 2200 navalised version of the SE 580
SE 2300 light two-seater private/trainer aircraft
SE 2301 projected development of above
SE 2310 tricycle version of SE 2300
SE 2311 same as above with retractable gear and fuel canisters in wings
SE 2400 project that led to the Grognard
SE 2410 GROGNARD I heavy attack bomber
SE 2415 GROGNARD II tactical support variant
SE 2416 GROGNARD single-seater for low-level attack, with RR Nene, wing of the SE 2415, 4 x 3 cm cannons (not built)
SE 2417 GROGNARD two-seat night-fighter, with HS Tay, wing of the SE 2415, 8 x 4 cm cannons (not built) (not built)
SE 2418 GROGNARD single-seat low-level attack, 2 x HS Tay, wing of the SE 2410, 2 x 3 cm cannons (not built)
SE 2419 GROGNARD with fuselage of the SE 2418, but wing of SE 2415, RR Nene (not built)
SE 2420 GROGNARD two-seat all-weather version, with HS Tay, modified wing of SE 2415, 8 x 3 cm cannons, possibility of in-flight refuelling (not built)
SE 2421 GROGNARD (no details) (not built)
SE 2422 GROGNARD single-seat low-level attack, changed wing from SE 2415 (not built)
SE 2423 GROGNARD as SE 2418 with wing of the SE 2415 (not built)
SE 2424 GROGNARD as SE 2418 with SNECMA Vulcain engine (not built)
SE 2450 last development of GROGNARDfighter, project (not built)
SE 2500 designation mentioned as similar to the X-201.02.01
SE 3000 heavy two rotor transport helicopter project (also allocated to former Focke-Achgelis Fa 223)
SE 3100 heavy single-rotor transport helicopter project
SE 3101 experimental sub-scale prototype version of SE 3100, first French helicopter
SE 311 HELIBUS tandem twin-rotor helicopter project
SE 3110 helicopter with twin tail rotors
SE 3120 ALOUETTE I (became Sud Aviation SA-312)
SE 3130 ALOUETTE II (became Sud Aviation SA-313)
SE 3131 ALOUETTE GOUVERNEUR (perhaps an early designation for SE 3140)
SE 314 modified
ALOUETTE II helicopter used in Frelon development
SE 3140 ALOUETTE GOUVERNEUR
SE 315 modified
ALOUETTE II helicopters as prototypes for Lama and Alouette III
SE 3150 LAMA (became Sud Aviation SA-315)
SE 3160 ALOUETTE III (became Sud Aviation SA-316)
SE 3164 ALOUETTE III (widened cockpit)
SE 3180 ALOUETTE II version
SE 3200 FRELON transport helicopter (became Sud Aviation SA-320)
SE 3210 SUPER FRELON transport helicopter (became Sud Aviation SA-321)
SE 4000 projected amphibian to meet I.C.A.O. requirements
SE 4030 twin-engine flying boat project of a larger SE 4000
SE 4100 first French missile, project only
SE 4200 first operational ramjet-powered ground-to-ground missile
SE 4202 variant of SE 4200
SE 4204 variant of SE 4200
SE 4205 variant of SE 4200
SE 4207 variant of SE 4200
SE 4208 variant of SE 4200
SE 4209 variant of SE 4200
SE 4210 variant of SE 4200
SE 4211 variant of SE 4200
SE 4212 variant of SE 4200
SE 4220 variant of SE 4200
SE 4230 variant of SE 4200
SE 4263 variant of SE 4200
SE 4280 variant of SE 4200
SE 4300 variant of SE 4100 with French radar
SE 4400 ramjet-powered ground-to-air missile with same radar as above
SE 4402 record-breaking variant of above
SE 4500 enlarged ramjet-powered version of the SE 4200 intended to carry a 700-kg bomb at a distance of 130 kms
(unknown designation)
CASSEUR ground-to-ground ballistic missile (SSBT) project with 100 kms range (1956-57)
SE 5000 BAROUDEUR jet interceptor for NATO
SE 5002 BAROUDEUR A project of reduced size
SE 5003 BAROUDEUR
SE 5004 BAROUDEUR project with ATAR 101 E.4 engine
SE 5008 BAROUDEUR project with ATAR 8 engine
SE 5010 BAROUDEUR project as light tactical support variant
SE 5012 BAROUDEUR projected production with Bristol Orpheus engine
SE 5020 projected derivative of BAROUDEUR with SNECMA M engine
SE 5030 BAROUDEUR M project with SNECMA M engine
SE 5040 projected variant of BAROUDEUR with Bristol Orpheus engine
SE 5091 projected variant of BAROUDEUR with Bristol Orpheus / Fiat engine
SE 6000 projected supersonic interceptor
S-55 "Eléphant Joyeux" (license-built Sikorsky S-55)
T-050 tandem two-seat touring aircraft 1942 project with twin engine (two coupled 50hp Gnome & Rhône X motorbike engines)
T-051 two-seat trainer project
T-052 transport project
Useful links:
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http://www.aviafrance.com/constructeur.php?ID_CONSTRUCTEUR=1144
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http://www.aviafrance.com/constructeur.php?ID_CONSTRUCTEUR=1256
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http://www.hydroretro.net/etudegh/sncase.pdf
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http://en.wikipedia.org/wiki/SNCASE