Diesel Air Dair 100

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.[1] The prototype was built in the 1990s and exhibited it at PFA (now LAA) airshows. Although Diesel Air engines have been fitted to an AT-10 airship and to a Luscombe 8A monoplane, [2] production numbers have been very limited.

Dair 100
Type Aircraft engine
National origin United Kingdom
Manufacturer Diesel Air

Design and development

The Dair 100 engine is a twin-cylinder two-stroke, opposed-piston, 1,810 cc (110.5 cu in) displacement, liquid-cooled, diesel engine direct drive design. It produces 100 hp (75 kW) at 2500 rpm, with a compression ratio of 18:1.[1] The engine has two cylinders and two crankshafts linked to four pistons, the combustion chamber formed between the crowns of the pistons. There are no poppet valves, each cylinder having a ring of ports at each end. In this "one-direction (uniflow)" engine these ports, respectively, admit air and expel exhaust gases. This design eliminates the need for a cylinder head and camshafts. Scavenging is assisted by a centrifugal air pump, the pump also serving to provide a mild supercharging effect. Fitment of an exhaust-driven turbocharger is permissible.[3]

The engine may use either diesel fuel (DERV) or Jet-A1 kerosene (AVTUR). Jet-A1 is more readily available at airfields, but its reduced lubricity (compared to diesel fuel) could mean that additional cylinder lubrication may be required. Fuel is directly injected into each cylinder, pressure being supplied by a hydraulically-governed mechanical fuel pump.[3]

Dry sump lubrication is by high pressure pump delivering oil to plain main bearings and con-rod bearings.[3]

Applications

Specifications (Dair 100)

Data from Tacke[1]

General characteristics
  • Type: Twin cylinder, two stroke diesel aircraft engine
  • Bore: 80 mm (3.1 in)
  • Stroke: 90 mm (3.5 in)
  • Displacement: 1,810 cc (110.5 cu in)
  • Length: 698 mm (27.5 in)
  • Width: 368 mm (14.5 in)
  • Height: 563 mm (22.2 in)
  • Dry weight: 93 kg (205.0 lb)

Components

Performance

See also

Related lists

References
  1. Tacke, Willi; Marino Boric; et al: World Directory of Light Aviation 2015-16, pages 256-257. Flying Pages Europe SARL, 2015. ISSN 1368-485X
  2. Diesel Air. "Various Pictures". www.dair.co.uk. Retrieved 15 March 2018.
  3. "Diesel Air pamphlet" (Press release). Olney, Buckinghamshire, United Kingdom: Diesel Air Ltd. 2002.
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