This engine and its larger cousin are frequently used on World War I aircraft, both vintage and modern reproductions.
Some notable repro WW I aircraft this engine has been used in are the Fokker Triplane, Sopwith Camel and the Nieuport 17.
Other experimental / homebuilt aircraft have also been fitted with the Rotec 2800, including the Kitfox Model 7; a popular kit aircraft with over 5,000 examples of all variants completed.
It is unknown how many Kitfox aircraft are equipped with the Rotec 2800 engine.
[1] These engines are not limited to only aircraft applications as JRL Cycles has converted an R2800 for use in a motorcycle.