Bourgois-Sénémaud AT.1 photo from Aero Digest December 1929
Bernard Bourgois was a well-known French coachbuilder who became interested in light aircraft construction in the later 1920s and turned to the established aircraft designer Sénémaud to realise his ideas.[1][2]
The result was the Bourgois-Sénémaud AT, an attractive aircraft of clean design, high build quality and comfort. Its parasol wing was in two symmetric parts and had a trapezoidal plan with gentle taper and squared-off tips. It tapered strongly in thickness, particularly on the underside, increasing the dihedral to about 2.5° at mean thickness. Each half-wing had two spruce box spars and was covered with stressed plywood. The ailerons were unusually narrow and long, filling the whole trailing edge. In addition to their usual differential action, they could be used together as flaps to alter the camber. The wing was held high above the fuselage on pairs of parallel struts, without wire bracing, from the principal fuselage frames at mid-fuselage to the wing spars at about 45% span. The centre-section was joined by a cabane of three inverted V-struts from the upper fuselage, one vertical and one backward-leaning to the forward spar and the other, vertical, to the rear.[2]
The first AT, known as the AT.35[3] was powered by a nose-mounted 26 kW (35 hp), three-cylinder Anzani 3A2radial engine.[1] The fuselage was built around a triangular section girder which provided a backbone on which transverse frames were mounted to define the ovoid section, ply-skinned exterior. There were two tandem seats in open cockpits with windscreens, the passenger placed below the wing at the centre of gravity and the pilot behind just under the trailing edge. Two starboard-side doors eased access. The fuselage tapered both in plan and particularly in profile, allowing the AT's large-area, short-span tailplane to be attached to the top of the internal girder. Its separate elevators were narrow and constant-chord. Like the tailplane, the fin had a swept leading edge and squared-off top. It carried a narrow-chord rudder which ran down to the keel, working in the gap between the elevators. The control surfaces were unbalanced.[2]
Its undercarriage was fixed and conventional, with a track of 1.80 m (71 in). Each main wheel was mounted on a hinged steel cranked axle and a backward-reaching drag strut, both from the central fuselage underside. A longer, telescopic strut to mid-fuselage containing rubber rings acted as a shock absorber, though oleo struts could be fitted instead. There was a spring-steel tailskid.[2]
The AT.35 first flew in 1928 and was displayed at the Paris Salon in mid-summer.[1] By the following spring the Anzani engine had been replaced by a 30 kW (40 hp) Salmson 9Ad nine-cylinder radial and the aircraft consequentially redesignated as the AT.40[4] or as the AT.1.[5] Deckert flew it for the first time on 18 April 1929;[6] it was about 100 kg (220 lb) heavier than the AT.35 but some 30 km/h (19 mph) faster.[1][2]
Operational history
The AT.1 had completed its certification by September 1929.[7] In April 1930 Deckert gave an aerobatic display at Orly.[8] In May it was flown from there by its new owner Robert David to his home in Marseille, a trip which took 7 hr 15 min including a stop at Dijon.[9] At the end of October 1930 he advertised it for sale, having flown a total of 35 hr.[10] It went to the Provencale aero club[11] but by May 1932 they, too, had put it up for sale.[12]
Two more AT.1s were built[4] but their histories are not known; only one Bourgois appears on reconstructed French civil aircraft registers, Robert David's F-AJIM, noted as a Bourgois-Senemaud 10, c/n.3[13]
Variants
AT.35
Original aircraft with Anzani engine. One built.
AT.40/ AT.1
AT.35 re-engined with Salmson plus two new examples.
Specifications (AT.40/AT.1)
Bourgois-Sénémaud AT 35 3-view drawing from Aero Digest September 1928
Stall speed: 75 km/h (47 mph, 40 kn) for AT.35, minimum speed.[1]
Range: 600 km (370 mi, 320 nmi) with one seat replaced by extra tanks:1,500 km (930 mi; 810 nmi)
Service ceiling: 3,500 m (11,500 ft)
References
^ abcdeFrachet, André (29 June 1928). "Bourgois". Les Ailes (367): 15–21.
^ abcdefFrachet, André (2 May 1929). "L'avion léger Bourgois-Senmaud". Les Ailes (411): 3.
^"Aviation civile". L'Aéronautique. 10 (109): 190. June 1928.
^ abBruno Parmentier (18 January 2005). "Bourgois-Sénemaud AT.40". Retrieved 4 September 2017.
^"L'avion léger Bourgois A.T.-1". L'Aéronautique. 11 (129): 170. May 1929.
^"Les premières vols de l'avionette Bourgois". Les Ailes (410): 15. 25 April 1929.
^"D'aérodrome en aérodrome". Les Ailes (420): 15. 12 September 1929.
^"Van Vloten, qui présenta son Junkers à Orly, est parti pour l'Espagne". Les Ailes (461): 11. 4 April 1930.
^"Paris-Marseille en 7 hr 15 avec le Bourois-Salmson". Les Ailes (463): 12. 1 May 1930.
^"Petites Annonces". Les Ailes (488): 20. 23 October 1930.
^"Club Provençal de tourisne aerien". Les Ailes (509): 14. 19 March 1931.
^"Petites Annonces". Les Ailes (519): 16. 28 May 1931.
^"Golden Years of Aviation". Retrieved 5 September 2017.
August 21, 2023
bourgois, sénémaud, parasol, wing, seat, touring, aircraft, built, france, 1928, three, examples, were, completed, 1role, touring, aircraftnational, origin, francemanufacturer, bernard, bourgoisdesigner, sénémaudfirst, flight, 1928number, built, contents, desi. The Bourgois Senemaud AT was a parasol wing two seat touring aircraft built in France in 1928 Three examples were completed Bourgois Senemaud ATAT 1Role Touring aircraftNational origin FranceManufacturer Bernard BourgoisDesigner SenemaudFirst flight 1928Number built 3 Contents 1 Design and development 2 Operational history 3 Variants 4 Specifications AT 40 AT 1 5 ReferencesDesign and development Edit Bourgois Senemaud AT 1 photo from Aero Digest December 1929Bernard Bourgois was a well known French coachbuilder who became interested in light aircraft construction in the later 1920s and turned to the established aircraft designer Senemaud to realise his ideas 1 2 The result was the Bourgois Senemaud AT an attractive aircraft of clean design high build quality and comfort Its parasol wing was in two symmetric parts and had a trapezoidal plan with gentle taper and squared off tips It tapered strongly in thickness particularly on the underside increasing the dihedral to about 2 5 at mean thickness Each half wing had two spruce box spars and was covered with stressed plywood The ailerons were unusually narrow and long filling the whole trailing edge In addition to their usual differential action they could be used together as flaps to alter the camber The wing was held high above the fuselage on pairs of parallel struts without wire bracing from the principal fuselage frames at mid fuselage to the wing spars at about 45 span The centre section was joined by a cabane of three inverted V struts from the upper fuselage one vertical and one backward leaning to the forward spar and the other vertical to the rear 2 The first AT known as the AT 35 3 was powered by a nose mounted 26 kW 35 hp three cylinder Anzani 3A2 radial engine 1 The fuselage was built around a triangular section girder which provided a backbone on which transverse frames were mounted to define the ovoid section ply skinned exterior There were two tandem seats in open cockpits with windscreens the passenger placed below the wing at the centre of gravity and the pilot behind just under the trailing edge Two starboard side doors eased access The fuselage tapered both in plan and particularly in profile allowing the AT s large area short span tailplane to be attached to the top of the internal girder Its separate elevators were narrow and constant chord Like the tailplane the fin had a swept leading edge and squared off top It carried a narrow chord rudder which ran down to the keel working in the gap between the elevators The control surfaces were unbalanced 2 Its undercarriage was fixed and conventional with a track of 1 80 m 71 in Each main wheel was mounted on a hinged steel cranked axle and a backward reaching drag strut both from the central fuselage underside A longer telescopic strut to mid fuselage containing rubber rings acted as a shock absorber though oleo struts could be fitted instead There was a spring steel tailskid 2 The AT 35 first flew in 1928 and was displayed at the Paris Salon in mid summer 1 By the following spring the Anzani engine had been replaced by a 30 kW 40 hp Salmson 9Ad nine cylinder radial and the aircraft consequentially redesignated as the AT 40 4 or as the AT 1 5 Deckert flew it for the first time on 18 April 1929 6 it was about 100 kg 220 lb heavier than the AT 35 but some 30 km h 19 mph faster 1 2 Operational history EditThe AT 1 had completed its certification by September 1929 7 In April 1930 Deckert gave an aerobatic display at Orly 8 In May it was flown from there by its new owner Robert David to his home in Marseille a trip which took 7 hr 15 min including a stop at Dijon 9 At the end of October 1930 he advertised it for sale having flown a total of 35 hr 10 It went to the Provencale aero club 11 but by May 1932 they too had put it up for sale 12 Two more AT 1s were built 4 but their histories are not known only one Bourgois appears on reconstructed French civil aircraft registers Robert David s F AJIM noted as a Bourgois Senemaud 10 c n 3 13 Variants EditAT 35 Original aircraft with Anzani engine One built AT 40 AT 1 AT 35 re engined with Salmson plus two new examples Specifications AT 40 AT 1 Edit Bourgois Senemaud AT 35 3 view drawing from Aero Digest September 1928Data from Les Ailes May 1929 2 General characteristicsCrew One Capacity One passenger Length 6 40 m 21 ft 0 in Wingspan 8 85 m 29 ft 0 in Height 2 640 m 8 ft 8 in Wing area 13 m2 140 sq ft Empty weight 300 kg 661 lb Gross weight 500 kg 1 102 lb Fuel capacity 70 L 15 imp gal 18 US gal Powerplant 1 Salmson 9Ad 9 cylinder air cooled radial 30 kW 40 hp Propellers 2 bladed woodenPerformance Maximum speed 155 km h 96 mph 84 kn Cruise speed 125 km h 78 mph 67 kn Stall speed 75 km h 47 mph 40 kn for AT 35 minimum speed 1 Range 600 km 370 mi 320 nmi with one seat replaced by extra tanks 1 500 km 930 mi 810 nmi Service ceiling 3 500 m 11 500 ft References Edit a b c d e Frachet Andre 29 June 1928 Bourgois Les Ailes 367 15 21 a b c d e f Frachet Andre 2 May 1929 L avion leger Bourgois Senmaud Les Ailes 411 3 Aviation civile L Aeronautique 10 109 190 June 1928 a b Bruno Parmentier 18 January 2005 Bourgois Senemaud AT 40 Retrieved 4 September 2017 L avion leger Bourgois A T 1 L Aeronautique 11 129 170 May 1929 Les premieres vols de l avionette Bourgois Les Ailes 410 15 25 April 1929 D aerodrome en aerodrome Les Ailes 420 15 12 September 1929 Van Vloten qui presenta son Junkers a Orly est parti pour l Espagne Les Ailes 461 11 4 April 1930 Paris Marseille en 7 hr 15 avec le Bourois Salmson Les Ailes 463 12 1 May 1930 Petites Annonces Les Ailes 488 20 23 October 1930 Club Provencal de tourisne aerien Les Ailes 509 14 19 March 1931 Petites Annonces Les Ailes 519 16 28 May 1931 Golden Years of Aviation Retrieved 5 September 2017 Retrieved from https en wikipedia org w index php title Bourgois Senemaud AT amp oldid 1125784290, wikipedia, wiki, book, books, library,
