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Sächsische Luftfahrt-Industrie GmbH was a German aircraft development company and manufacturing company for aircraft components in Dresden between 1934 and 1937.
The Sächsische Luftfahrt-Industrie GmbH (S.F.I.) was founded on 8 January 1934 in Dresden.  As technical director at S.F.I. in 1934, Erich Gammelin took up the idea of a low-cost light aircraft, of which a prototype S.F.I.-Gammelin Ga.1 was built in Dresden.  After the Reich Ministry of Aviation had shown no interest in another aircraft development company, the S.F.I. took over production orders for aircraft components from other manufacturers from 1935 onwards.  Erich Gammelin then resigned from the management in February 1935.
Due to a lack of funds for further plant expansion, the S.F.I. was dissolved on 31 March 1937

The S.F.I.-Gammelin Ga.1 was built in 1934 by the Sächsische Luftfahrt-Industrie GmbH in Dresden as a convertible light aircraft.

In 1934, Erich Gammelin took up the idea of an inexpensive light aircraft that was affordable for everyone at the Sächsische Flugzeug-Industrie GmbH. Based on the Raab-Katzenstein RK 9 Grasmücke light aircraft, which was developed with Antonius Raab and Paul Hall at the Raab-Katzenstein-Werke, S.F.I. in Dresden created the S.F.I.-Gammelin Ga.1, a so-called combination aircraft, which on the one hand had a simple, inexpensive structure and on the other hand could be used for a wide variety of uses, such as sports, art and, school and cruise flights.
The first flight of the S.F.I.-Gammelin Ga.1 took place on 21 July 1934 in Dresden by Erich Gammelin. [2] The Reich Ministry of Aviation showed no interest in the development of light aircraft. A series recording did not take place at S.F.I.
In its basic design, the two-seater S.F.I.-Ga.1 was a shoulder-wing monoplane in mixed construction. The wings were made of wood, while the fuselage was a tubular steel construction. A special feature was the landing gear. The legs of the chassis were made of tubular steel and their suspension of rubber buffers was not attached to the outside of the aircraft, but inside the fuselage. The landing shocks were transmitted to the buffers by means of a lever transmission, which made it possible to accommodate the landing gear struts inside the aircraft and to cover them completely, so that landing gear drag could be reduced to a minimum. An 80 hp Hirth HM60R engine was used as the drive.
Another special feature of the aircraft was its configurability. For school and advertising flights, the wing could be extended with attachments. The short base wings could be used for aerobatics and sport flights. For longer cruising flights, the cockpit area could be covered with an easy-to-install glass canopy.