Type Single seat glider Single seat motorglider
Engine None 1 DKW 14 hp
Dimensions Length 6,15 m, height 1,70 m, span 8,50 m, wing area 15,00 m2, aspect ratio 4,8 Length 6,00 m, height 1,75 m, span 8,00 m, wing area 16,00 m2, aspect ratio 4,0
Weights Empty 125 kg, flying weight 200 kg, pilot 75 kg, wing loading 13,3 kg/m2 Empty 170 kg, flying weight 260 kg, fuel 12 kg, oil 3 kg, pilot 75 kg, wing loading 16,2 kg/m2
Performance Max.. speed  Endurance 2,5 h
Type Werk.Nr Registration History
301 D-1351 First flight 15 March 1927. Registered April 1928. Raka, Kassel. Withdrawn from use April 1932
302 D-1379 June 1928. Ostpreussiche Flugbetrieb, Elbing. Withdrawn from use April 1932
303 D-1392 May 1928. Raka, Kassel. Withdrawn from use April 1932
305 D-1352 April 1928. Raka, Kassel. Withdrawn from use April 1932
The RK-7 Smetterling was built in three weeks for the well-known chocolate manufacturer Johann Gottlieb HAUSWALDT, from Magdeburg (Germany), whose logo was JGEHA (short for his name). It was used to make one of the very first take-offs in tow of an airplane. Antonius RAAB at the command of the glider was towed by Kurt KATZENSTEIN flying a Raab-Katzenstein RK-6 Kranich (D-975), on March 15, 1927 [other date April 18, 1927?] on the Kassel-Waldau airfield.
During the international airshow in Zurich, Switzerland, which took place from August 12 to 21, 1927, this glider was repeatedly towed by a Fieseler aircraft, then dropped. Each time he came to land right in front of the judges.
Source: Aerokurier 1970