In 1934, the Klemm Leichtflugzeugbau set up a new factory at Halle, for production of all-metal aircraft (as opposed to Klemms normal light aircraft) and transferred the development of a new twin-engined transport, the Klemm Kl 104 to the Halle factory, the type being redesignated Fh 104. Klemm transferred control of the factory to Fritz Siebel in 1937, the year the Fh 104 prototype first flew.
It had a metal fuselage, plywood covered wings and a hydraulic undercarriage that retracted into the lower part of the engine nacelles. It became known as the 'Hallore' after the name given to those born in that city.
Fh 104s won long distance flying competitions in 1938 and an example flew 40,000 km around Africa in 1939. It won the principal award in the 1938 Littorio Rally.
During World War II the aircraft was used as a personal transport aircraft by some senior Wehrmacht officers and officials including Adolf Galland, Albert Kesselring and Ernst Udet. At least 15 aircraft appeared on the pre-war German civil register.
The larger Siebel Si 204 was based on it.
- Czechoslovakian Air Force (Postwar)
- Slovak Air Force (1939-1945)
Crew: One or two pilots
Capacity: Up to 5 passengers
Length: 9.50 m
Wingspan: 12.06 m
Height: 2.64 m
Wing area: 22.3 m²
Empty weight: 1,510 kg
Loaded weight: 2,350 kg
Powerplant: 2 × eight-cylinder inverted V Hirth HM 508, 209 kW (280 hp) each
Maximum speed: at sea level 350 km/h
Cruise speed: 335 km/h
Range: 920 km
Service ceiling: 6,600 m
Rate of climb: to 1,000 m 6.0 m/s