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 edit
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 edit
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 edit
Specifications edit
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[2]
- 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 edit
Comparable engines
Related lists
References edit
- ^ a b "LF 39". D-Motor International. Retrieved 16 March 2019.
- ^ 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.
- ^ D-Motor publicity specification sheet, August 2014
- ^ D-motor performance graph
- ^ "Kapelstraat 198 8540 Deerlijk - News". D-motor1.vpweb.be. Archived from the original on 2012-03-28. Retrieved 2012-05-10.
- ^ D-Motor (2014). "Expected Price". www.d-motor.eu. Archived from the original on 3 September 2014. Retrieved 1 September 2014.
- ^ "D-motor update ultralight engine". D-Motor. Archived from the original on 22 January 2018. Retrieved 8 December 2014.
- ^ "Technische Daten". EDM Aerotec GmbH. Retrieved 8 December 2014.
- ^ "LF26 specifications". D-motor. Archived from the original on 2 June 2014. Retrieved 26 June 2012.
- ^ D-Motor (15 March 2019). "LF39 Dimensions". d-motor.eu. Archived from the original on 3 September 2014. Retrieved 1 September 2014.