D-Motor LF39

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.

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

Design

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]

Development

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]

Applications

Specifications

Reference: D-Motor[9][10]

General characteristics

  • Type: horizontally opposed flat six
  • Bore: 103.6mm (4.1 in)
  • Stroke: 79 mm (2.91 in)
  • Displacement: 3,993 cc (244 cu in)
  • Length: 648.7 mm (25.54 in)
  • Width: 566 mm (22.28 in)
  • Height: 423.4 mm (16.67 in)
  • Dry weight: 74 kg (163 lb) with exhaust, radiator & external oil tank

Components

Performance

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See also

Comparable engines

Related lists

References
  1. "LF 39". D-Motor International. Retrieved 16 March 2019.
  2. "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.
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