No. 6093. Kortenbach & Rauh Kora 1 (D-KORT c/n V2)
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Kortenbach & Rauh Kora 1

02/28/2014. The Kortenbach & Rauh Kora was an unorthodox two-seat powered sailplane designed by Schultes, Seidel and Putz and built by Kortenbach & Rauh KG of Solingen, West Germany.

The Kora featured a twin-boom configuration with a central pod fuselage, housing a roomy 47 in (1.20 m) wide cockpit with side-by-side seating under a fully transparent canopy which opened sideways to the right, and after the cockpit the engine, driving a Hoffmann two-blade variable-pitch pusher propeller which could be feathered for soaring flight. The cantilever high aspect-ratio wings were constructed of wood and had Schempp-Hirth airbrakes on their upper surfaces.

The advantages of the twin-boom pusher layout were that drag was reduced, noise levels were lowered and the forward cockpit visibility was improved. Indeed visibility was more closely akin to that found in high-performance sailplanes, to which students trained on the Kora would eventually graduate. The Polish SZD-45A Ogar powered sailplane possessed a similar configuration, but with a single tailboom.

The first prototype, designated Kora 1-V1 and registered D-KORS (c/n V1), made its first flight on September 13, 1973, powered by a 65 hp Sportavia Limbach SL 1700EA Volkswagen-derived engine. This aircraft had a fully-retractable landing gear, the main legs retracting into the twin booms which supported the high-set tailplane. Flight trials with this aircraft proved successful.

The second prototype, the Kora 1-V2, was built incorporating minor changes aimed at saving weight. It had a landing gear comprising two fixed main wheels units set on thin steel-sprung legs cantilevered from the fuselage nacelle, and a forward-retracting nose wheel. It first flew on April 9, 1976, powered by a 65 hp SL 1700 ECI.

Although test flying of the Kara 1-V2 was nearly completed in 1979, and despite orders for about a dozen aircraft, no series production followed. The fate of the aircraft is unknown.

Created January 22, 2007