D-Motor LF39 explained

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.[1] It is a derivative of the flat four D-Motor LF26.

Design

The LF39 produces 1250NaN0 and has a dry weight of 740NaN0.[2] The power curve is virtually linear from 50 kW @ 1920 rpm to 91.55 kW @ 3100 rpm.[3] 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.

Development

With the aid of funding from the Belgian government,[4] 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.[1]

The 2014 expected price was €17,800.[5]

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".[6]

Applications

Specifications

Reference: D-Motor[8] [9]

Notes and References

  1. Web site: Kapelstraat 198 8540 Deerlijk - Recent information . D-motor1.vpweb.be . 2012-08-14 . dead . https://web.archive.org/web/20120328094443/http://d-motor1.vpweb.be/Recent-information.html . 2012-03-28 .
  2. D-Motor publicity specification sheet, August 2014
  3. D-motor performance graph
  4. Web site: Kapelstraat 198 8540 Deerlijk - News . D-motor1.vpweb.be . 2012-05-10 . dead . https://web.archive.org/web/20120328094526/http://d-motor1.vpweb.be/News.html . 2012-03-28 .
  5. Web site: Expected Price. 1 September 2014. D-Motor. www.d-motor.eu. 2014. https://web.archive.org/web/20140903144302/http://www.d-motor.eu/nl/expected-price-65.htm. 3 September 2014.
  6. Web site: D-motor update ultralight engine. D-Motor. 8 December 2014. https://web.archive.org/web/20180122223029/http://www.d-motor.eu/nl/update-05-sept-2014-119.htm. 22 January 2018.
  7. Web site: Technische Daten. EDM Aerotec GmbH. 8 December 2014.
  8. Web site: LF26 specifications . D-motor . 26 June 2012. https://web.archive.org/web/20140602200944/http://www.d-motor.eu/nl/specifications-38.htm. 2 June 2014.
  9. Web site: LF39 Dimensions. 1 September 2014. D-Motor . d-motor.eu. 15 March 2019. https://web.archive.org/web/20140903144600/http://www.d-motor.eu/nl/dimensions-91.htm. 3 September 2014.

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