OWING to the various competitions in Germany last year one type was neglected, a moderately high‐powered machine for stunt flying. The Raab‐Katzenstein firm has now filled the gap with the “R.K. 26,” which combines high strength factor with speed and rapid climb. This machine is a cantilever biplane with one‐piece wings. Above the fuselage the top wing is carried on a capotage of steel struts and there is one N‐strut towards the wing‐tip on each side. The American N.A.C.A. M‐12 aerofoil section is used, giving low centre of pressure travel, the wings being constructed of wood and fabric covered. The fuselage is built up of wire‐braced steel‐tubes, the pilot's cockpit being in rear of the passenger seat. The empennage is also constructed of steel tubes. The tubular steel undercarriage has a divided circle supported by M struts for the bottom longerons. Four fuel tanks are provided, three in the wings and a special tank for upside‐down flying in the fuselage, with a total capacity of 210 litres (46 gallons).
Beck, W. (1929), "Designed for Aerobatics in Germany: Raab‐Katzenstein Firm at Cassel Produces Cantilever Biplane with One‐Piece Wings for Stunt Flying", Aircraft Engineering and Aerospace Technology, Vol. 1 No. 5, pp. 182-182. https://doi.org/10.1108/eb029154
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