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April, 1932 AIRCRAFT ENGINEERING 87 Th e Potez 37R.2 Two-Seater Monoplane with Oval Tubula r Rear-end of Fuselage H E Potez 37 R 2 monoplane is one of a number of new reconnaissance planes constructed b y the French Industry for the "Concours de s Avions de Reconnaissance" instituted by the Frenc h Air Ministry. The many innovations incorporated in its construction make it one of th e most interesting of the new long distance reconnaissance machines. One of the most notable of these is the use of a beam extending from the fuselage proper and carrying the tail. This beam, forming the tail section, has already been intro duced with success by Breguet,* and offers advan tage s in that the observer-gunner has increased visibility, and is afforded a greater are of fire. Further , it is claimed that there is less resistance, an d that the reduced tail section gives greater efficiency to the control surfaces of the tail. Another feature in the construction of the new Pote z aeroplane is found in the number of easily detachabl e parts, which facilitates inspection, storage and transport. Th e Potez R2 is a two-seater high-wing mono plane of all metal construction fitted with a LEADING CHARACTERISTICS U-section. These are assembled by gussets Hispano Suiza 12Nb engine, rated at 650 h.p., Spa n 14·200 m . (46·5 ft.) wit h steel rivets. The corrugated duralumin sheet which develops 713 h.p . at 2,000 r.p.m. The wing Maximu m chord 2·500 m . (8·2 ft.) covering of the fuselage is similar to that on the Overal l Length 10·500 m. (33·7 ft.) consists of two outer sections joined to a centre Overal l Height 3·500 m. (11.4 ft.) wing. section carried above the fuselage by N struts. Wing Surface 35 sq.m . (376·6 sq . ft.) Th e tail section is also attached to the fuselage The two outer sections are rigidly braced by two Weigh t empty 1,867 kgs. (4,106·7 lbs.) b y four bolts. It is in the form of a large tube of „ of fuel 340 kgs. (749·7 lbs.) oblique spars of duralumin on each side, extending ,, of special equipment 169 kgs . (372·6 lbs.) oval section and has a covering of duralumin sheet, from their mid-sections to the lower part of the „ of crew 160 kgs . (352·8 lbs.) similar to that of the wings and fuselage. The fuselage. The wing has a constant thickness and ,, loaded 2,536 kgs. (5,591·8 lbs.) extrem e end of this beam is detachable, per ha s neither dihedral nor sweepback. It has a Wing Loading 72·500 kgs./sq . m. (14·85 lbs. / sq . ft.) mittin g read y access t o th e control organs within it. Clark V.H. (N.A.C.A.) section, which has been Powe r Loading 3·900 kgs./h.p . (18·6 lbs./h.p.) Th e pilot's cockpit is placed under the trailing successfully employed on three other types of Spee d at Ground Level ... 264 k.p.h . (163·9 m.p.h.) edge of the centre section of the wing where there Pote z machines. „ at 6,000 m . (20,000 ft.) 220 k.p.h. (136·6 m.p.h.) Clim b to 6,000 m . ... ... 26 mins . 20 secs. is a wide cut-out for upward view. It is well Th e outer sections are composed of five principal Theoretica l Ceiling 7,500 m. (24,600 ft.) protecte d by a large wind screen and contains a an d easily detachable elements: the central Take-oi l Run 190 m . (623 ft.) sea t that is vertically adjustable during flight. Landing-Ru n 205 m . (672 ft.) element, the leading edge, the wing tip, the aileron Th e observer-gunner occupies a cockpit immediately an d the " faux aileron " or trailing edge, joined Th e inset ailerons are of narrow chord and wide behind that of the pilot. His seat folds up when togethe r by attachments of high tensile steel. Like span and are rigidly controlled. Their structure no t in use and the floor is fitted with two panels th e centre section, the y are built up on two I-section consists of a triangular box frame, having one main which may be opened, one being intended for spars, the flanges of which are of corrugated steel spar. The trailing edge section of the wing is photographi c work. sections, while the webs are constructed of dura similar in construction to th e ailerons an d is attache d Th e horizontal empennage consists of an adjust lumin. The duralumin ribs are also of I-section. t o th e central element of th e wing b y standar d angle abl e stabiliser, the area of which is 2.25 sq. m. The y are located approximately one metre apart, irons in steel. (24.21 sq. ft.), and two balanced elevator flaps, an d carry the attachment pieces t o which the metal th e stabiliser being braced to the fuselage from Th e fuselage is constructed in three quickly covering of corrugated duralumin sheet is riveted. beneat h by inverted Vec struts. The vertical detachabl e parts: the engine mounting, the Thi s is divided into a number of easily detachable rudde r behind the fin is unbalanced. The structure fuselage proper, and the tail section. The engine panels which permits easy inspection of an y section mounting , of duralumin, is attached t o th e fuselage of the tail surfaces is similar to that of the wing. of the wing structure. b y four bolts. The fuselage contains th e pilot's and Th e landing gear is of the divided type and has Th e leading edge is attached to the central gunner' s cockpits as well as th e fuel and oil tanks, a track of 3 m. (10 ft.). It consists of two units, element of the wing by steel lugs at each of the th e former, which is fitted with a quick-release each of which is composed of Vee legs hinged to the ribs . The wing tips are built up of five spars, the device, containing 340 k.g. (97 gals.) of petrol. It lower fuselage longerons, and a vertical leg, with tw o principal of which correspond to the main wing ha s a lattice form construction, duralumin being Pote z patent shock-absorbers, attached to the an d carry the steel angle irons for attachment. used throughout, consisting of four longerons forward wing strut. At this point of attachment connected by struts braced by diagonal and trans ther e is a short inclined bracing strut from the *See AIRCRAF'T ENGINEERING, Vol. II, September, 1930, pp. vers e members in duralumin alloy of drawn to p longeron. The wheels are fitted with brakes. 219-222 . French Military Aeroplane Nomenclature In connection with the above article we give Th e B.N-2 (Bombardement de nuit) is a two- A B.P-3 (Bombardement Protecteur) is a three- details of the French classification. seater night bomber, the B.N-3. or 4 machines seater multi-place de combat machine intended to Th e figure following the letter indicates in each being the larger three- and four-seaters. Among accompany bombing expeditions far into enemy case the number of seats. th e standard machines in this class are the Amiot, territory . Th e C-1 typ e is th e single-seater fighter "pursuit " th e Farman Goliath, and the Lioré et Olivier. A T.O.E. (Theatre des Operations Extérieur) or chasse. Among machines of this type are the An E.P-2 machine (Ecole de pilotage) is a two- machine is specially adapted for foreign or colonial Morane Saulnier, Dewoitine, Blériot Spad, L.G.L., seater primary training 'plane, types in use being service. and Nieuport Delage. th e Hanriot, Morane Saulnier, Blériot, and Caudron. Th e A-2 (Artillerie biplace) is the two-seater E.T-2 (Ecole de tourisme) is a two-seater training An R-2 (Reconnaissance) is a two-seater for day observation type, and is distinguished from the typ e for cross-country flying, the E.T-1 being the reconnaissance. reconnaissance type in tha t it is not intended for single-seater for the same service. Th e R.N. (Reconnaissance de nuit) are the night penetratin g far into enemy territory.' The Breguet S. (Sanitaire) stands for ambulance machine. reconnaissance machines. 19 an d the Potez 25 are of this type. A number of new types for this service have been Th e B-2 (Bombardement) is a two-seater day designed by leading constructors during the past G.R. machines (Grande Raid) are a special type bomber , the Breguet 19 and Potez 25 being con tw o years, among which are th e Potez and Blériot intende d for long-distance flights, but which vertible for this service. types . actuall y have no place in the military service.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Apr 1, 1932
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