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January, 1930 AIRCRAFT ENGINEERING 19 Detail s of a Ne w 28-Passenger Transport Monoplane With a Thic k Wing Central Body and Twin Fuselages HE Société Aérienne Bordelaisc of Bor wing engines to avoid interference batween the The fuselages are attached to th e centre section deaux (formerly the Société Anonyme propellers. The engines are separated from the of the wing and are built up on four longerons des Travaux Dyle et Bacalan) have with vertical frames and cross pieces an d covered passenger cabins by a fire wall and by a second recently assembled and tested their new with duralumin sheet. The tails of the two wall intended to absorb their noise. A passage 28-passenger transport plane at th e Champ fuselages are joined by the stabilising surface. extending across inside the leading edge of the d'Aviation do Mérignac. The D.B.70, like al l The horizontal elements of the empennage centre section gives the mechanic access to all Dyle et Bacalan machinery, is characterised consist of a stabiliser, the angle of which can three engines in flight and a t th e same time by its large central body in the form of a thick permits him to communicate with the pilots. wing, in which are accommodated the pas The fuel supply is carried in tw o wing tanks, sengers and th e crew and to which are attached having a tota l capacity of 2,800 litres (610 gal Characteristics the outer wings, the engine mountings, the two lons), sufficient to give a range of 51- hour s a t Span .. .. 37 m. (121 ft. 5 in.) fuselages, and landing gear. The centre section cruising speed. Length .. .. 20 m. (65 ft.) of the new machine, designed by M. L. de The pilot's cockpit is placed forward over the Height .. .. 6 m. (19 ft. 8 in.) Monge, is of particula r interest, since i t embodies centre engine mounting and has accommodation Total surface .. 218sq.m. (2,346sq.ft.) a somewhat similar application of the principle for two side by side. Dual control is provided. Weight empty .. 7,600 kg. (16,720 lb.) employed in the new Junkers J-38, recently The pilots are able to communicate with the Weight of fuel .. 2,000 kg. (4,400 lb.) completed in Germany. The D.B.70 is derived mechanic and navigator a t all times. Useful load .. 2,900 kg. (6,380 lb.) from the D.B.10, a twin-engined night bomber, The passenger accommodation consists of Total weight .. 13,000 kg. (28,600 lb.) and, like all Dyle et Bacalan machines, is two cabins located in the two fuselages, which Power .. .. 1,800 h.p. built mainly of duralumin, with high tensile steel are united by the central wing section, in which in parts of th e frames, covered with duralumin is a salon. Behind the salon on one side is a Estimated Performances sheet throughout. small compact kitchen and on the other side a Maximum speed As constructed, the wing is composed of a lavatory . A promenade extends across th e front a t ground level 200 k.p.h. (125 m.p.h.) of the salon behind, and parallel to the corridor centre section, to which are attached the two Cruising speed a t leading to th e engines. Combined, the two outer wing sections. This centre section, 1,000 metres . . 180 k.p.h. (112 m.p.h.) . cabins and the salon have a total volume of which forms an importan t par t of th e passengers' Radius of action 5½ hours. 58 cub. m. (2,048 cub. ft.). Each of th e two cabin, is very thick and has a biconvex profile. Ceiling .. .. 4,500 m. (14,750 ft.) cabins has a width of 1·80 m. (6 ft.) and a Its frame is constituted by four principal steel length of 5·3 5 m. (17 ft. 6 in.). The cabins transverse spars, braced and crossed by duralumin panels. The section of thi s frame have been arranged so as t o accommodate in the longitudinal plane of the aeroplane has a passengers for night and day flights. With the bo varied in flight, and thre e compensated daytime arrangements the machine can accom depth of 2·3 0 m. (7 ft. 6 in.) and a length of elevators. Each of the two rudders consists modate 28 passengers, while a t night i t can carry 1·95 m. (6 ft. 5 in.). In cross section there are of a fin an d flap. All elements of the empennage 24 in berths . The day arrangement provides five bays between six frames. The two end are metallic and are constructed in th e same for 10 passengers in each fuselage cabin and 8 in frames, which are situated in th e sides of the manner as the outer wing structures. th e salon, where 2 table s have been placed for the fuselage, are "V " braced. They are attached The landing gear consists of tw o units, one convenience of th e passengers. In each of the to the longerons in the same manner as are the under each wing engine, with two wheels each. vertical and cross pieces by gussets which give fuselage cabins there are two rows of seats with a Actually these units are suspended from th e the whole a rigid assembly. central passage-way between them. At nigh t two extremities of th e centr e section of the these two cabins are equipped with 16 berths wing and give the landin g gear a track of The two outer sections of th e wing are fixed on two levels, while the salon accommodates 8, 6· 7 m. (21 ft.). Each unit is hun g on a longitu by steel attachments to th e upper edge of th e th e seats being easily transformed into berths. dinal "V " braced by an ar m extending towards centre section and have a constant chord over A large baggage compartment is located behind th e centre of the bottom of the centre wing their entire span and a dihedral of 3 deg. th e salon. Access to th e passenger cabins is section. They are equippe d with oleo-pneu- They are rigidly braced on both sides by two b y three entrances, the principal one being matic shock absorbers and th e wheels are oblique braces which extend from the mid through the floor of the after part of the salon, fitted with brakes. section of the outer wings to the bottom or centre wing section, where a trap arrange longerons of the centre wing section, crossed by The D.B.70 is powered by thre e 600 h.p. men t is placed between the kitchen and lavatory struts at their centres and reinforced by geared Hispano-Suiza engines giving a total allowing access by a small ladder. There diagonals. The wing structure is composed of of 1,800 h.p. The engine mountings extend are also two doors in th e sides of the centre two main spars with the usual ribs, to which is forward from the centre section of the wing section. riveted the covering of duralumin sheet. wit h the centre engine in advanc e of th e two
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jan 1, 1930
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