D-Motor LF26

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
D-Motor LF26
Type Piston aero engine
National origin Belgium
Manufacturer D-Motor
Unit cost US $18,500 (2015)[1]
Developed into D-Motor LF39

The D-Motor LF26 is a lightweight liquid cooled side-valve four-stroke flat four, 2.7 litre petrol aircraft engine, produced by D-Motor in Deerlijk, Belgium.

Design and development[edit]

This direct-drive aero-engine is unusual in two respects: it is very oversquare with a bore:stroke ratio of 1.295:1, and it has a side-valve (flathead) valvetrain. The designer determined that since maximum continuous power output (65.3 kW[2]) was to be developed at only 2800 rpm, the extra weight and complexity of overhead valves (OHV) would be superfluous. The resulting engine is compact and lightweight, with a dry weight of 58 kg (128 lb),[3] and a maximum power-to-weight ratio of 1.09 kW/kg (wet; coolant fluids weigh 5 kg (11 lb)[3]). The engine has port injection, a dry sump lubrication system, and dual ignition.


With the aid of funding from the Belgian government,[4] D-Motor has developed a derivative 4-litre flat-six engine,the D-Motor LF39, which is claimed to produce 125 PS (92 kW) and to have dry weight of 78 kg (172 lb).[5]



Reference: D-Motor[3]

General characteristics

  • Type: horizontally opposed flat four
  • Bore: 103.6mm ( 4.1 in)
  • Stroke: 80 mm (2.91 in)
  • Displacement: 2690 cm3
  • Length: 611 mm
  • Width: 533 mm
  • Height: 382 mm
  • Dry weight: 58 kg with exhaust, radiator & external oil tank



See also[edit]

Comparable engines

Related lists


  1. ^ "Belgium firm offers Light Sport engine". AOPA Pilot: 40. March 2015.
  2. ^ "D-motor dmotor LF26 specifications". www.d-motor.eu. Retrieved 2016-08-11.
  3. ^ a b c "LF26 specifications". D-motor. Retrieved 26 June 2012.
  4. ^ "Kapelstraat 198 8540 Deerlijk - News". D-motor1.vpweb.be. Archived from the original on 2012-03-28. Retrieved 2012-05-10.
  5. ^ "D-motor dmotor LF39 specifications". www.d-motor.eu. Retrieved 2016-08-11.
  6. ^ D-Motor (n.d.). "X-air test plane". Retrieved 2 August 2011.

External links[edit]