Frank Stelzer

from Wikipedia, the free encyclopedia

Frank Stelzer (born February 4, 1934 in Görlitz ; † May 12, 2007 in Oberursel ) was a German inventor.


Stelzer was self-taught. He described himself as a "free inventor". He developed a new two-stroke free-piston engine in a cylindrically elongated, bilateral symmetrical design, the Stelzer engine named after him .

He owned numerous patents. In connection with his marketing attempts in the 1980s, Stelzer was temporarily in custody under suspicion of fraud. For tax reasons, Stelzer had a residence in Ireland for years , the Irish government subsidized the development of his engine.

Frank Stelzer was buried on May 22, 2007 in the forest cemetery in Bad Homburg.


Frank Stelzer developed the " Stelzer motor " named after him and patented by him . This is a 2-stroke internal combustion engine designed as a " free piston engine ".

The Stelzer engine can do three things: generate compressed air, pump hydraulic fluid and, as a linear generator, generate electricity.

The simplest version of the Stelzer engine has only one moving part: the free piston. This free piston is designed as a stepped piston and controls the charging process with an ignitable mixture and the expulsion of the burnt gases. The linear current generator he manufactured has demonstrated its practical suitability in numerous runs. The Stelzer engine has been in trials since the 1970s. Series production was aimed at. The conclusion of a license agreement with Iran was about to be concluded. Because of his death, it didn't come to that.

Frank Stelzer essentially continued the work of Hugo Junkers , which he had to give up in 1933. Hugo Junkers also dreamed of a powerful free piston engine for generating electrical energy, and he failed because of the same difficulties as Frank Stelzer. In contrast to Frank Stelzer, however, Professor Junkers had resounding success in many other areas.

Web links

Individual evidence

  1. Interview with Frank Stelzer, Links ( Memento from September 27, 2010 in the Internet Archive ) - FAKTuell