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The D-Motor LF26 is a lightweight liquid cooled side-valve four-stroke flat four, 2.7 litre petrol aircraft engine, produced by D-Motor in Deerlijk, Belgium.[1]
| D-Motor LF26 | |
|---|---|
| Type | Piston aero engine |
| National origin | Belgium |
| Manufacturer | D-Motor |
| Developed into | D-Motor LF39 |
This direct-drive aero-engine is unusual in two respects: it is very oversquare with a bore:stroke ratio of 1.295:1, and it has a side-valve (flathead) valvetrain. The designer determined that since maximum continuous power output (65.3 kW[2]) was to be developed at only 2800 rpm, the extra weight and complexity of overhead valves (OHV) would be superfluous. The resulting engine is compact and lightweight, with a dry weight of 58 kg (128 lb),[2] and a maximum power-to-weight ratio of 1.09 kW/kg (wet; coolant fluids weigh 5 kg (11 lb)[2]). The engine has port injection, a dry sump lubrication system, and dual ignition.
With the aid of funding from the Belgian government,[3] D-Motor has developed a derivative 4-litre flat-six engine, the D-Motor LF39, which is claimed to produce 125 PS (92 kW) and to have dry weight of 78 kg (172 lb).[4]
Reference: D-Motor[2]
General characteristics
- Type: 4-cylinder liquid-cooled horizontally-opposed piston engine
- Bore: 103.6mm (4.079 in)
- Stroke: 80 mm (3.15 in)
- Displacement: 2690 cm3
- Length: 611 mm
- Width: 533 mm
- Height: 382 mm
- Dry weight: 58 kg with exhaust, radiator & external oil tank
Components
- Valvetrain: camshaft in block, side valves
- Fuel system: port injection
- Fuel type: AVGAS 100/130 or petrol 91, 93, 95, 98 RON
- Oil system: Dry sump
- Cooling system: liquid cooling
Performance
- Power output: Max 68.9 kW (93.7 PS; 92.4 hp) at 3,100 RPM; continuous 65.3 kW (88.8 PS; 87.6 hp) at 2,800 RPM
- Compression ratio: 8:1
- Fuel consumption: 16 litres/h at 100 % power
- Power-to-weight ratio: Max 1.09 kW/kg (wet); continuous 1.04kW/kg (wet)
Comparable engines
- HKS 700E
- Jabiru 2200
- KFM 112M
- Revmaster R-2300
- Rotax 912
- Sauer S 2200 UL
- Sauer S 2400 UL
- Sauer S 2100 ULT
- ULPower UL260i
- Verner 133M
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