Aircraft Engines Built by Stoewer

Pre World War  I 

During  1911 and 1912, Stoewer engaged the services of Russian immigrant Boris Loutzkoy (aka Boris Lutsk and Boris von Lutsky) for the development of an aircraft engine.  Loutzkoy had already established an enviable record in engineering development. In 1888 he patented a gas engine which was exhibited in the Munich Exhibition of that year.  In 1890 he became Chief Engineer with Maschinenbau AG, Nürnberg which after the merger with  Maschinenfabrik AG,Augsburg in became Maschinenfabrik Augsburg Nürnberg now better known by the acronym "MAN".  In 1907 he was responsible for the construction of an internal combustion marine engine of 6,000 HP for the Russian destroyer "Prominant". 

The engine that Loutzkoy designed for Stoewer was a water-cooled 4-cylinder model with 140 mm bore and 120 mm stroke giving 8,621 cc of capacity.  Its distinctive design included an overhead camshaft with overhead valves and hemispherical combustion chamber.  This engine produced 100 HP at 1,800 rpm.

​Stoewer also produced a 6-cylinder version of the Loutzkoy engine but this was never commercialised and further details are not available. 

Loutzkoy designed, 4-cylinder, 8,621 cc OHC/OHV engine delivering 100 HP at 1,800 rpm.

The 6-cylinder version of the Loutzkoy designed OHC/OHV aircraft engine.

During World War I

In 1916, after the restructuring of Stoewer Brothers into a joint stock company Stoewer AG, aircraft engines were manufactured under license to Argus.  Two models were produced, both 6-cylinder with push-rod operated overhead valves.

The smaller of the engines produced was known as the As II St. This engine had a bore of 130 mm, stroke of 140 mm and capacity of 11,150 cc. It produced 120 HP at 1,350 rpm.  Approximately 142 of these engines were produced.

The larger version of this engine was the As III St. This had a bore of 150 mm and stroke of 145 mm giving a displacement of 15,380 cc.  Horsepower produced was 180 at 1,300 rpm. Approximately 834 of these engines were produced by Stoewer.  Three are known to have survived and are held in the Deutsche Museum in Munich and in museums in the UK and Switzerland.

The As III St engine produced by Stoewer under license to Argus.

During World War II

Stoewer was not involved in aircraft engine production during WWII.