Raab Krähe
D- KONY in the Technik Museum Speyer
The Raab crow is a constructed by Fritz Raab and intended for the Amateurbau motor glider, which was manufactured by the German manufacturer rock glider in series.
History
The " Crow " was developed by Fritz Raab in the tradition of previous glider design Doppelraab and the motor glider test patterns Motorraab and Dohle, composed of Flugtechnischer engineering Gerhard Siegel in Gauting. For the replica group within the amateur construction there was a plan set of 53 drawings, in which the glider J. skirt also questioned the appropriate kit parts available in Inzell.
The crow was designed from the outset as self-starting motor glider with the leaflets skills should correspond to those of a good exercise sailors. The second design premise has been to achieve a robust and simple construction and therefore a good replica ability in flying groups. The basic design work was completed in 1957 and on 10 June of the same year launched the first prototype with the registration D - Egaz for its maiden flight. The powerplant is a Goggo motor 400 was used.
The second prototype differed only by installing a Brändl ZB 300 engine and first flew in 1958. The third prototype was presented in 1960 at the World Gliding Championships in Cologne- Butzweilerhof. The fourth prototype first flew in 1959 on the motor glider meeting in Augsburg as a pure glider but was later also the Brändl engine. Since this type of engine did not own a cooling fan when installing large cooling air judges were necessary. It was the fifth prototype received a Brändl engine with a corresponding cooling fan and thus corresponded to the serial version.
The crow was even bootable from an engine power of 16 hp, but it could motors up to 40 hp and 75 kg are installed. A major achievement was not exploitable because of the limited to 1.32 m propeller diameter.
Construction
The crow is a cantilever shoulder -wing monoplane of wooden construction. The three-part airfoil has a spar. The wing center section has a rectangular shape, the trapezoidal outer wing parts have a V -position, and carry almost the entire trailing edge one-piece aileron. The hull is constructed very simply with a boat-shaped front, and a flat tail boom which is clamped with four steel cables to the wing trailing edge. The engine is mounted behind the pilot's seat and drives a rigid two-bladed wooden propeller pressure. The Propeller runs between Upper and lower the tail boom.
The chassis consists of a central wheel in front of the center of gravity and a Heckkufe. The pilot's seat is located in front of the wing leading edge and is covered by a hood.