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Aviation History
1927
1927 - 0431.PDF
JUNE 16, 1927 almost stall-proof. It takes off quickly and climbs well, while having a low-landing speed it can be used on com- paratively small aerodromes. It also has a large reserve of power, which makes for economic running. The characteristics of the BH. 25 are:—Span, 15-3 m. (50 ft.) ; length, 12-82 m. (42 ft.) ; wing area, 62-5 sq. m. (672-5 sq. ft.) ; weight empty, 450 Lorraine,—1,950 kg. (4,299-7 lb.) ; 430 " Jupiter "—1,800 kg. (3,969 lb.) ; total weight, Lorraine—2,970 kg. (6,548-8 lb.) ; " Jupiter "—2,900 kg. (6,394-5 lb.) ; wing loading, Lorraine—47 kg./sq. m. (9-61b./sq.ft.) ; " Jupiter "—46-5 kg./sq. m. (9-5 lb./sq. ft.) ; power loading, Lorraine—6kg./h.p. (13-2 lb./h.p.) ; "Jupiter" —6-7 kg./h.p. (14-7 lb./h.p.) ; speed range, Lorraine—60— 190 [k.p.h. (37-118 m.p.h.) ; "Jupiter"—50—185 k.p.h. (31—114-7 m.p.h.); ceiling, 4,500 m. (14,760 ft.); range, 480 km. (297-6 miles) ; factor of safety, 8. Of the military machines, the B.H. 33 is a high performance, single-seater fighter biplane, and an entirely new type deve- loped from the B.H. 21, but considerably modified, being redesigned around the new Bristol " Jupiter VI." Of some- what similar design and construction is the B.H. 26, which is a two-seater fighter, also fitted with the " Jupiter VI." Both machines have single bay wings of wood con- struction, with two box spars and plywood covering from the leading edge to the rear spar ; the wing is also covered all over with fabric. Ailerons are hinged to the lower planes, those on the B.H. 26 being balanced, and the top plane is in one piece. The wing bracing is by N-struts and streamline control is fitted, and the tail plane is adjustable from the pilot's cockpit. The characteristics of the B.H. 28 are : Span, 11-8 m. (38 ft. 9 ins.) ; wing area, 36-5 sq. m. (392-7 sq. ft.); weight empty, 1,150 kg. (2,535-7 lbs.); total weight, 1,930 kg. (4,255-6 lbs.); wing loading, 52.5 kg./sq. m. (10-7 lbs./sq. ft.) ; power loading, 5-3 kg./h.p. (ll-61bs./h.p.) ; speed range, 70—225 k.p.h. (43—146 m.p.h.); climb to 5,000 m. (16,400 ft.), 25 mins. ; ceiling, 6,000 m. (19,680 ft.) ; range, 3—5hrs. ; factor of safety, 10. Aero Tovarna Letadel Aero Tovarna Letadel, or the " Aero Aircraft Factory," are responsible for the following two military-type aeroplanes, the A-ll and the A-30, of which the former has a number of record flights to its credit. As both types figured in the last Paris Aero show, and were dealt with in FLIGHT at the time it will not be necessary here to refer to these machines in detail. The A-ll is a two-seater reconnaissance tractor biplane, in which three types of engine may be installed—the 240 h.p. Walter, the 240"h.p. Penin II, or the 300 h.p. Hispano-Suiza, all water-cooled V engines. Except for the different engines all three are generally similar in design and construction. As far as type is concerned the A-ll is a comparatively large-span biplane with single-bay bracing, the top plane having a larger span and chord than the lower one. Both planes are without dihedral angle, the upper wings being attached THE PRAGUE AERO SHOW : The Aero A-30. This is a long-distance two-seater reconnaissance biplane, similar to the A-ll, but fitted with a 450 h.p. Lorraine-Dietrich engine, or engine of equal weight and power. wires. The engine mounting is of steel tubing, with four- point and quick release attachment. The characteristics of these two machines are :— B.H.2Q.—Span, 108 m. (35 ft. 6 ins.) ; wing area, 31-45 sq. m. (338-4 sq. ft.) ; weight, empty, 1,030 kg. (2,271 lbs.) ; total weight, 1,630 kg. (3,594 lbs.)"; speed range, 86—242 k.p.h. (53—150 m.p.h.) ; climb to 5,000 m. (16,400 ft.) ; 15 mins. 50 sees. ; ceiling. 8,000 m. (26.240 ft.) ; range, 2 hrs. factor of safety, 11—13. B.H. 33.—Span, 8-9 m. (29 ft. 2 ins.) ; wing area, 22 sq. m. (236-7 sq. ft.); weight empty, 830 kg. (1,830 lbs.); total weight, 1,230 kg. (2.712 lbs.) ; speed range. 78—266 k.p.h. (48—165 m.p.h.) ; climb to 5,000 m. (16,400 ft.), 8 mins. 50 sees. ; to 7,000 m. (22,960 ft.) ; 16 mins. ; ceiling, 10,000 m. (32,800 ft.) ; range, 2 hrs. ; factor of safety, 12—14. •*The third military Avia machine is the B.H. 28 two-seater reconnaissance biplane, a modified edition of the B.H. 26, fitted with a 385 h.p. Siddeley " Jaguar." It is of the ortho- dox single-bay Avia type, "and except for certain details introduced to meet the "requirements of reconnaissance work, is similar to the other Avia types. The wings are of the same wood construction, the top plane bemg in three sections and the lower one in two. They are of a high lift cross section, with uniform thickness" up to the struts, thereafter tapering to the tips. Balanced ailerons are hinged to the lower plane only. As in the other machines, the fuselage is of wood and ply- wood construction, with steel-tube engine mounting. The seats are arranged in tandem with the observer at the rear, provided with the usual gun ring, camera and wireless. Dual 393 to a centre section (which also carries the service petrol tank) and the lower wings direct to the fuselage. They are of normal wood-and-metal fittings construction, with spruce spars and ply ribs, fabric covered. The ailerons, of steel tube construction, are balanced and fitted to the top plane only. The angle of incidence of the tail plane can be adjusted during flight. The fuselage is of steel tube construction with fabric covering, except for the engine section, which is enclosed by an aluminium cowling. The cockpits are arranged in tandem, with the pilot in front and the observer behind, with the usual gun mountings. Dual control is provided, the observer's joy-stick being detachable and, when not in use, is carried in clips on the side of the cockpit. The equipment includes, in addition to the two guns mounted on the movable ring on the observer's cockpit, a fixed machine gun firing forward, camera gear, wireless, parachutes, etc. The main petrol tank, of 185 litres capacity, is located in the fuselage immediately behind the engine, and with the 120 litres of the service tank, the total petrol carried is thus 305 litres. The principal characteristics and performance of the A-ll arc :— Span, 12-7 m. (41ft. Ill ins.) ; length, S-12 m. (26 ft. 7-Hns) height, 3-1 m. (10 ft. 2 ins.) ; wing area, 36-5 sq. m. (392-8 sq. ft.): weight, empty, 1,027 kgs. (2,264-5 lbs.); total weight, 1,534-3 kgs. (3,383-1 lbs.) ; wing loading, 42 kg./sq. m. (8-6 lbs./sq. ft.) ; power loading, 6-4 kg./h.p. (14-1 lbs./h.p.); speed, 215 k.p.h. (130 m.p.h.) ; climb to 5,000 m. (16,400 ft.), 19 mins. 20 sees.; ceiling, 7,600 m. (24,928 ft.) ; range, 3 J-6 hrs. c 2
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