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Aviation History
1927
1927 - 0422.PDF
JUNE 9, 1927 AT THE PRAGUE AERO SHOW : The A via B.H.28 a two-seater reconnaissance biplane fitted with a 385 h.p.Armstrong-Siddeley "Jaguar," a close-up of which is shown on the right. 'plane for Scout pilots. It is a smaller and lower-powered version of the B.H.22, which is also a single-seater advanced training biplane, but fitted with an Hispano water-cooled engine of 180 h.p. This latter machine is developed from the B.H.21 fighter (300 h.p. Hispano), and has, in fact the same wings and fuselage. The wings are of the single bay type •with N-struts, the top plane being in one piece and of slightly smaller span than the lower plane. The wings are of standard box-spar construction with plywood and fabric covering, while the fuselage is also of wood construction, consisting of four longerons, formers, and plywood covering. The B.H.22 has a good performance—speed, 215 k.p.h. (133 m.p.h.), climb to 5,000 m. (16,400 ft.) in 22 mins.—which renders it particularly suitable for advanced fighter and stunt training : it is provided with a camera-gun. Furthermore, owing to its low stalling speed (below 80 k.p.h. or 50 m.p.h.) it is possible to use it in small aerodromes, etc. As previously stated, the B.H.20 is similar, except as regards power, performance and size, to the B.H.22, and needs no further description other than the following figures : B.H.20.—Span, 7-9 m. (26 ft.) ; wing area, 16-1 sq. m. (173-2 sq. ft.) ; weight empty, 330 kg. (727-6 lbs.) ; total weight, 480 kg. (1,058-4 lbs.) ; speed range, 60-160 k.p.h. (37-99 m.p.h.) ; ceiling, 5,500 m. (18,000 ft.) ; range, 3 hrs. ; factor of safety, 10. While on the subject of training machines we may as well turn next to the B.H.29, which is a two-seater school machine (85 h.p. Walter), for primary training. In this new machine we find a thorough departure from standard A via design. It is a biplane with staggered wings of orthodox wood and fabric construction, and a plywood fuselage. The wing area is large, giving a low wing loading—28 kg. ,'sq. m. (5-7 lbs./sq. ft.) Both wings are in two sections, and have the usual N-strut and wire bracing. The engine mounting is of steel tubing, with sheet cowling, and has 4-point attachment. A non- axle undercarriage is fitted, each wheel being carried by three struts, one of which embodies the rubber disc shock absorber. The main characteristics are :— B.H.29 — Span, 9-8 m. (32 ft.) ; wing area, 25 sq. m. (269 sq. ft.); weight empty, 450 kg. (992-2 lbs.); total weight, 700 kg. (1,543-5 lbs.) ; speed range, 55-145 k.p.h. (34-90 m.p.h.) ; ceiling, 4,000 m. (13,120 ft.) ; range. 3Jhrs. ; factor of safety, 10. (To be continued) AVIA MACHINES AT PRAGUE AERO SHOW: At the top (right) is the new B.H.25, a commercialpassenger machine with 450 h.p. Lorraine engine. Below is the B.H.22, with 180 h.p. Hispano, an advanced training (fighter) biplane. : 384
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