D-Motor LF39
| 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.
Design
[edit | edit source]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 | edit source]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 | edit source]Specifications
[edit | edit source]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 | edit source]Comparable engines
Related lists
References
[edit | edit source]- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ D-Motor publicity specification sheet, August 2014
- ^ D-motor performance graph
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