• Source: 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. It is a derivative of the flat four D-Motor LF26.




Design


The LF39 produces 125 hp (93 kW) and has a dry weight of 74 kg (163 lb). The power curve is virtually linear from 50 kW @ 1920 rpm to 91.55 kW @ 3100 rpm. 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, 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.
The 2014 expected price was €17,800.
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".




Applications


EDM Aerotec CoAX 2D/2R
Hungaro Copter
Niki Kallithea
Niki Lightning




Specifications


Reference: D-Motor




= 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

=
Valvetrain: camshaft in block, side valves
Fuel system: port injection
Fuel type: 100/130 Avgas or petrol 91, 93, 95, 98 RON
Oil system: Dry sump
Cooling system: liquid cooling




= Performance

=
Power output: 82.4 kW (112 PS) at 2,800 RPM (max peak power: 91.55 kW (124 PS) at 3,100 RPM)
Compression ratio: 8:1
Power-to-weight ratio: 1.26 kW/kg




See also



Comparable engines

Jabiru 3300
Rotax 914
Wilksch WAM 120
Related lists

List of aircraft engines




References






External links


Official website

Kata Kunci Pencarian:

• D-Motor LF39
• D-Motor
• D-Motor LF26
• Flat-six engine
• Niki Lightning
• Flat-four engine
• Svenska Flygfabriken LN-3 Seagull
• EDM Aerotec CoAX 2D/2R
• Hungaro Copter
• Niki Kallithea