Claim: Diesel Air Dair 100 is an opposed-piston diesel aircraft engine whose design eliminates the need for a cylinder head and camshafts, but may use either diesel fuel (DERV) or Jet-A1 kerosene (AVTUR).
Evidence: The Diesel Air Dair 100 is an opposed-piston diesel aircraft engine, designed and produced by Diesel Air Ltd of Olney, Buckinghamshire for use in airships, home-built kitplanes and light aircraft. This design eliminates the need for a cylinder head and camshafts. The engine may use either diesel fuel (DERV) or Jet-A1 kerosene (AVTUR).