The D-Motor LF26 is a lightweight

liquid cooled Liquid cooling refers to cooling by means of the convection or circulation of a liquid. Examples of liquid cooling technologies include: * Cooling by convection or circulation of coolant, including water cooling * Liquid cooling and ventilatio ...

side-valve

four-stroke A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either directio ...

flat four, 2.7 litre petrol

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...

, produced by

D-Motor D-Motor is a Belgian aircraft engine manufacturer based in Deerlijk. The company specializes in the design and manufacture of aircraft engines for homebuilt and ultralight aircraft.Bayerl, Robby; Martin Berkemeier; et al: ''World Directory o ...

in Deerlijk, Belgium.

Design and development

This direct-drive aero-engine is unusual in two respects: it is very

oversquare In a reciprocating piston engine, the stroke ratio, defined by either bore/stroke ratio or stroke/bore ratio, is a term to describe the ratio between cylinder bore diameter and piston stroke length. This can be used for either an internal comb ...

with a bore:stroke ratio of 1.295:1, and it has a side-valve (flathead)

valvetrain A valvetrain or valve train is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) ...

. The designer determined that since maximum continuous power output (65.3 kW) 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 , and a maximum power-to-weight ratio of 1.09 kW/kg (wet; coolant fluids weigh ). The engine has port injection, a dry sump lubrication system, and

dual ignition Dual Ignition is a system for spark-ignition engines, whereby critical ignition components, such as spark plugs and magnetos, are duplicated. Dual ignition is most commonly employed on aero engines,Crane, Dale: ''Dictionary of Aeronautical Terms ...

Variants

With the aid of funding from the Belgian government, D-Motor has developed a derivative 4-litre flat-six engine, the D-Motor LF39, which is claimed to produce and to have dry weight of .

Applications

BOT SC07 Speed Cruiser The BOT SC07 Speed Cruiser is a German ultralight and light-sport aircraft, designed produced by BOT Aircraft of Oerlinghausen and introduced in 2009. The aircraft is supplied as a complete ready-to-fly-aircraft.Bayerl, Robby; Martin Berkemei ...

Foxcon Terrier 200 The Foxcon Terrier 200 is an Australian light-sport aircraft, designed and produced by Foxcon Aviation of Mackay, Queensland. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.Bayerl, Robby; M ...

* Niki Lightning *

Peak Aerospace Me 109R The Peak Aerospace Me 109R is a family of German replica warbird ultralight aircraft that was designed by Tassilo Bek, and originally produced by Peak Aerospace of Pasewalk. The company since changed its name to Classic Planes GmbH . The ...

Raj Hamsa X-Air The Raj Hamsa X-Air is an Indian, two-seat, high-wing, tricycle gear, tractor configuration, ultralight aircraft produced by Raj Hamsa Ultralights of Bangalore, Karnataka in kit form, for amateur construction.Vandermeullen, Richard: ''2011 K ...

Slepcev Storch The Slepcev Storch ( en, Stork) is a Serbian type-certified, kit and ultralight STOL aircraft, designed by Yugoslavian-Australian Nestor Slepcev and currently produced by Storch Aircraft Serbia in several different versions. The ultralight ...

* Sherwood Ranger

Specifications

Reference: D-Motor

References

External links