Siebel Fh 104 Hallore

The Siebel Fh 104 Hallore was a small twin-engined transport, communications and liaison aircraft designed by the German aircraft manufacturer Klemm Leichtflugzeugbau and produced by Siebel.

The Fh 104, which was originally designated Klemm Kl 104, represented a considerable departure from Klemm's previous aircraft designs, being largely composed of metals, such as duralumin, instead of wood and fabric. While the fuselage was mostly made of duralumin, the wing was primarily composed of wood. A new facility in Halle was built to produce the type, however, Klemm transferred control of the Halle factory to Fritz W. Siebel prior to quantity production commencing.

A pair of prototypes were produced, the first of which performed its maiden flight during 1937. Quantity production commenced one year later; sales of the type were augmented by the Fh 104's strong performance in several aerial competitions and long-distance circuits. The type was procured by both civilian and military operators, the Luftwaffe being a key customer. During the Second World War, Fh 104s were flown by the Luftwaffe in several capacities, including communication, liaison, and as the personal aircraft of various high ranking officials. During May 1942, production of the Fh 104 was ceased; by this point, the company had already put into production an enlarged derivative, the Siebel Si 204.