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wing without the struts used on the AB-20 and DB-70. The undercarriage had also been cleaned up with streamlined legs and wheels in long cowlings. The nose was further complicated, retaining the upper, open gunner's position but now with double underhanging windowed positions, though the conical
151:
and undercarriage were also attached to the centre section. The generous intra-wing volume equally offered crew, fuel and bomb-room for military purposes. Initially the AB-20 was intended to have three engines like its predecessor, but during the design phase there was a military request for a
184:
ring, directly above. The nose also carried a long, conical probe with fine extensions, possibly pressure sensors. Further aft there was an enclosed pilot's cabin. A second gunner was stationed rearwards, on top of the centre section and a third fired from a
155:
Apart from the extra engines and the very different crew compartment, together with the removal of passenger accommodation, the AB-20 and DB-70 had much in common: the thick centre section and high-mounted outer wings, twin fuselages carrying a long
179:
The new central crew pod was flat-sided and tapered forwards to a complicated cylindrical nose, formed by a simple lower part with an overhanging, windowed cabin for the navigator/bombardier and an open gunner's cockpit, fitted with a
138:
airliner. The change of manufacturer's name was the result of the financial failure of Dyle et
Bacalan in 1929, followed by its immediate reappearance as SAB, who took over DB-70 development. The latter was built around a thick, wide
152:
bombardier's position and a gunner's cockpit in the nose, which required the removal of the centre engine and its replacement by two extra engines wing-mounted outboard of the centre section.
653:
710:
Borget, Michel (April 1970). "Les "Burnelli" français: progéniture du DB 70; l'AB 20 (3)" [The French "Burnelli"s: The
Offspring of the DB 70, the AB 20, Part 3].
899:
727:
Borget, Michel (May 1970). "Les "Burnelli" français: le AB 20, AB 21 et AB 22... (4)" [The French "Burnelli"s: The AB 20, AB 21 and AB 22..., Part 4].
693:
Borget, Michel (March 1970). "Les "Burnelli" français: le DB 70 et sa progeniture (2)" [The French "Burnelli"s: The DB 70 and Its
Offspring, Part 2].
122:
airliner. It featured a lifting body of thick airfoil section between the inner engines. It was later modified for the attack role; a second aircraft, the
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The first flight of the AB-20 was on 15 January 1932. The following year it was reported that it had been structurally modified for the
476:
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airfoil centre section which provided generous internal space for passengers. The engines were mounted on this structure as were twin
559:
531:
503:
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The sole prototype AB-20, with a crew of five, modified with a 75 mm gun firing sideways. Test firing took place at
276:
in
September 1934, but was terminated after five rounds had been fired due to structural damage to the lower wing skin.
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Trials of an airborne sideways-firing 75 mm gun were carried out with the AB-20 prototype modified as the
471:
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Similar to the AB-20 and DB-70 but with cantilevered wings and powered by four 493 hp (368 kW)
236:. Firing trials were halted after damage was caused to the lower wing skin by blast from the gun muzzle.
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249:
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201 m (2,160 sq ft) including the central body area of 88 m (950 sq ft)
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715:
698:
448:
140:
221:
198:
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781:
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175 km/h (109 mph, 94 kn) to 185 km/h (100 kn; 115 mph)
44:
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to carry the tail. The outer wings were of normal thickness and chord, and the
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The SAB AB-20 was a four-engine night bomber development of the three-engine
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with pairs of mainwheels widely separated on V-struts attached to the lower
111:
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210 km/h (110 kn; 130 mph) at 3,500 m (11,500 ft)
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205 km/h (111 kn; 127 mph) at 2,000 m (6,600 ft)
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126:, had different engines and cleaner aerodynamics but no more were built.
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663:(in French). Argenteuil: SGA: 114–115. December 1932. Archived from
611:"S.A.B. AB-21 - Bombardier lourd - Un siècle d'aviation française"
589:"S.A.B. AB-20 - Bombardier lourd - Un siècle d'aviation française"
208:
207:
28:
353:
V-12 water-cooled piston engines, 370 kW (500 hp) each
791:
633:"S.A.B. AB-22 - Expérimental - Un siècle d'aviation française"
540:. Vol. XXV, no. 1301. 30 November 1933. p. 1202
512:. Vol. XXIV, no. 1209. 26 February 1932. p. 170
161:
568:. Vol. XXVI, no. 1316. 15 March 1934. p. 253
532:"Airisms from the Four Winds: French "attack" machines"
374:
198 km/h (123 mph, 107 kn) at sea level
248:
A four-engined bomber derived from the three-engined
456:
maximum load 2,500 kg (5,500 lb) of bombs
118:built in the early 1930s as a development of the
803:
252:, powered by four 493 hp (368 kW)
224:water-cooled engines and a tapered, filleted
8:
498:
496:
494:
492:
216:By early 1934 a much developed version, the
416:5,000 m (16,000 ft) in 40 minutes
413:4,000 m (13,000 ft) in 25 minutes
404:* 1,000 m (3,300 ft) in 5 minutes
343:1,295 kg (2,855 lb) in four tanks
810:
796:
788:
410:3,000 m (9,800 ft) in 17 minutes
407:2,000 m (6,600 ft) in 11 minutes
661:Revue de la Société Générale Aéronautique
392:1,000 km (620 mi, 540 nmi)
488:
18:
7:
422:67 kg/m (14 lb/sq ft)
220:had appeared. It had the newer V-12
729:Le Album de Fanatique de l'Aviation
712:Le Album de Fanatique de l'Aviation
695:Le Album de Fanatique de l'Aviation
313:36.7 m (120 ft 5 in)
307:21.9 m (71 ft 10 in)
560:"New Aircraft: Where is the moat?"
477:List of Interwar military aircraft
319:6.84 m (22 ft 5 in)
14:
750:
27:
631:Bruno Parmentier (1998-08-30).
609:Bruno Parmentier (1998-08-30).
587:Bruno Parmentier (1998-08-30).
447:3x 7.7 mm (0.303 in)
337:13,250 kg (29,211 lb)
895:1930s French military aircraft
331:8,450 kg (18,629 lb)
1:
910:Four-engined tractor aircraft
398:5,500 m (18,000 ft)
920:Four-engined piston aircraft
915:Aircraft first flown in 1932
16:1930s French bomber aircraft
900:Société Aérienne Bordelaise
821:Société Aérienne Bordelaise
504:"A new French Night Bomber"
170:conventional undercarriages
68:Société Aérienne Bordelaise
936:
763:"The Next War In The Air"
201:role and was returning to
829:
731:(in French) (11): 24–27.
714:(in French) (10): 24–26.
654:"Avions A.B 20 et A.B.21"
431:0.11 kW/kg (0.0672 hp/lb)
35:
26:
21:
697:(in French) (9): 24–26.
110:was a large four engine
472:List of bomber aircraft
292:General characteristics
176:of the centre section.
281:Specifications (AB-21)
213:
818:Aircraft produced by
769:photo bottom of pg 67
254:Lorraine 12Fb Courlis
250:Dyle et Bacalan DB-70
211:
158:horizontal stabilizer
136:Dyle et Bacalan DB-70
120:Dyle et Bacalan DB-70
99:Dyle et Bacalan DB-70
759:at Wikimedia Commons
670:on 27 September 2015
351:Lorraine 12Ha Pétrel
264:Lorraine 12Ha Pétrel
168:. Both aircraft had
905:Twin-boom aircraft
449:Lewis machine guns
214:
88:1 AB-20 + 1 AB-21
45:Heavy night bomber
882:
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765:Popular Mechanics
755:Media related to
402:Time to altitude:
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591:. Aviafrance.com
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78:15 January 1932
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48:Type of aircraft
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773:SAB AB-20 Video
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55:National origin
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420:Wing loading:
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212:AB-20 in 1932
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75:First flight
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64:Manufacturer
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672:. Retrieved
665:the original
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637:. Retrieved
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203:Villacoublay
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107:
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84:Number built
839:SAB-SEMA 12
834:SAB-SEMA 10
572:11 December
544:11 December
516:11 December
365:Performance
357:Propellers:
347:Powerplant:
205:for tests.
193:Development
182:machine gun
160:, and twin
889:Categories
639:2011-01-01
617:2011-01-01
595:2011-01-01
483:References
427:Power/mass
323:Wing area:
226:cantilever
36:SAB AB-21
757:SAB AB-20
737:0757-4169
720:0757-4169
703:0757-4169
311:Wingspan:
286:Data from
269:SAB AB-22
259:SAB AB-21
245:SAB AB-20
174:longerons
145:fuselages
112:twin boom
108:SAB AB-20
461:See also
437:Armament
359:2-bladed
266:engines.
256:engines.
240:Variants
189:turret.
777:YouTube
674:8 April
317:Height:
305:Length:
187:ventral
166:rudders
149:cockpit
114:French
59:France
735:
718:
701:
565:Flight
537:Flight
509:Flight
454:Bombs:
390:Range:
274:Cazaux
199:attack
130:Design
116:bomber
70:(SAB)
22:AB-21
874:LH-70
869:DB-81
864:DB-80
859:AB-80
854:AB-22
849:AB-21
823:(SAB)
779:from
668:(PDF)
657:(PDF)
445:Guns:
299:Crew:
234:AB-22
218:AB-21
141:chord
124:AB-21
41:Role
844:AB-2
733:ISSN
716:ISSN
699:ISSN
676:2015
574:2022
546:2022
518:2022
349:4 ×
164:and
162:fins
106:The
775:on
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491:^
811:e
804:t
797:v
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301:5
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