D-Motor LF26

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D-Motor LF26
Type Piston aero engine
National origin Belgium
Manufacturer D-Motor
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[1]) 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),[1] and a maximum power-to-weight ratio of 1.09 kW/kg (wet; coolant fluids weigh 5 kg (11 lb)[1]). The engine has port injection, a dry sump lubrication system, and dual ignition.


With the aid of funding from the Belgian government,[2] 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).[3]



Reference: D-Motor[1]

General characteristics



  • Power output: Max 68.9 kW (93.7 PS; 92.4 hp) at 3,100 RPM; continuous 65.3 kW (88.8 PS; 87.6 hp) at 2,800 RPM
  • Compression ratio: 8:1
  • Fuel consumption: 16 litres/h at 100 % power
  • Power-to-weight ratio: Max 1.09 kW/kg (wet); continuous 1.04kW/kg (wet)

See also[edit]

Comparable engines

Related lists


  1. ^ a b c d "LF26 specifications". D-motor. Archived from the original on 16 July 2019. Retrieved 16 July 2019. CS1 maint: discouraged parameter (link)
  2. ^ "Kapelstraat 198 8540 Deerlijk - News". D-motor1.vpweb.be. Archived from the original on 2012-03-28. Retrieved 2012-05-10. CS1 maint: discouraged parameter (link)
  3. ^ "D-motor dmotor LF39 specifications". www.d-motor.eu. Archived from the original on 2016-09-01. Retrieved 2016-08-11.
  4. ^ D-Motor (n.d.). "X-air test plane". Archived from the original on 17 December 2010. Retrieved 2 August 2011. CS1 maint: discouraged parameter (link)

External links[edit]