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D-Motor LF39

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D-Motor LF39
Type Piston aero engine
National origin Belgium
Manufacturer D-Motor
First run July 2013[1]
Developed from D-Motor LF26

The D-Motor LF39 is a lightweight liquid cooled side-valve four-stroke flat six 4 litre petrol aircraft engine, produced by D-Motor in Deerlijk, Belgium.[2] It is a derivative of the flat four D-Motor LF26.


The LF39 produces 125 hp (93 kW) and has a dry weight of 74 kg (163 lb).[3] The power curve is virtually linear from 50 kW @ 1920 rpm to 91.55 kW @ 3100 rpm.[4] Just like its smaller sibling, the LF26, this direct-drive aero-engine has a side-valve (flathead) valvetrain. The engine has port injection, a dry sump lubrication system, and dual ignition.[1]


With the aid of funding from the Belgian government,[5] the D-Motor LF39 was developed from the LF26. The company encountered problems with the casting of the flat-six cylinder block and there were further problems with the flywheel/alternator, but these were solved using a lighter flywheel with neodymium magnets.[2]

The 2014 expected price was 17,800.[6]

In September 2014, EDM Aerotec announced the results of test flying the engine in their EDM Aerotec CoAX 2D/2R coaxial rotor helicopter, saying, "We are glad to present the 6 cylinder in action. After more than 100 hours testflying ... the coax helicopter equipped with the 6 cylinder... (proved) a perfect combination according to the test pilots." and added, "Another 6 cylinder has been installed in a test plane in Belgium".[7]



Reference: D-Motor[9][10]

General characteristics



See also[edit]

Comparable engines

Related lists


  1. ^ a b "LF 39". D-Motor International. Retrieved 16 March 2019.
  2. ^ a b c "Kapelstraat 198 8540 Deerlijk - Recent information". D-motor1.vpweb.be. Archived from the original on 2012-03-28. Retrieved 2012-08-14.
  3. ^ D-Motor publicity specification sheet, August 2014
  4. ^ D-motor performance graph
  5. ^ "Kapelstraat 198 8540 Deerlijk - News". D-motor1.vpweb.be. Archived from the original on 2012-03-28. Retrieved 2012-05-10.
  6. ^ D-Motor (2014). "Expected Price". www.d-motor.eu. Archived from the original on 3 September 2014. Retrieved 1 September 2014.
  7. ^ "D-motor update ultralight engine". D-Motor. Archived from the original on 22 January 2018. Retrieved 8 December 2014.
  8. ^ "Technische Daten". EDM Aerotec GmbH. Retrieved 8 December 2014.
  9. ^ "LF26 specifications". D-motor. Archived from the original on 2 June 2014. Retrieved 26 June 2012.
  10. ^ D-Motor (15 March 2019). "LF39 Dimensions". d-motor.eu. Archived from the original on 3 September 2014. Retrieved 1 September 2014.

External links[edit]