Superior Air Parts Gemini Diesel 125 Explained

The Superior Air Parts Gemini Diesel 125 is a diesel aircraft engine, under development by Superior Air Parts of Coppell, Texas, United States for use in homebuilt aircraft.^[1]

The company is owned by the Chinese company Superior Aviation Beijing, which is 60% owned by Chairman Cheng Shenzong and 40% owned by Beijing E-Town, an economic development agency of the municipal government of Beijing.

Design and development

The Gemini Diesel 125 is a three-cylinder two-stroke, in-line, supercharged liquid-cooled, diesel engine design. It produces 1250NaN0, with a helical gear mechanical gearbox reduction drive with a reduction ratio of 1.586:1.^{[1] [2] [3]}

The engine design uses an opposed-piston engine, with "two-opposing-pistons-per-cylinder", based upon the Second World War 6-cylinder, 12-piston Junkers Jumo 205 engine concept.^[3]

The engine will not be type certified and is therefore intended for homebuilt and light-sport aircraft.^[2]

Notes and References

1. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 262-263. Flying Pages Europe SARL, 2015.
2. Web site: Gemini Diesel 125. 17 April 2018. Superior Air Parts. geminidiesel.aero . 2015.
3. Web site: Gemini uniflow diesel engine. 17 April 2018. Superior Air Parts. geminidiesel.aero . 2015.