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D-Motor LF39
The D-Motor LF39 is a lightweight liquid cooled, 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 and has a dry weight of .〔D-Motor publicity specification sheet, August 2014〕 Just like its smaller sibling, the LF26, 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 valvetrain. The designer determined that since maximum continuous power output was to be developed at only 2800 rpm, the extra weight and complexity of overhead valves would be superfluous, so the resulting engine is compact and lightweight. The engine uses fuel injection, so carburetor heat is unnecessary. Lubrication is by dry sump, with an external oil tank. Dual ignition is used, each cylinder having twin spark plugs sited between the valves and the piston crowns.
Unlike an engine which uses ohc to be capable of high revs, a feature of the slow-revving side-valve arrangement is that the engine does not suffer high frictional losses, so the power curve is completely linear from 50 kW @ 1920rpm to 91.55 kW @ 3100rpm.〔D-motor performance graph〕 An inherent disadvantage of the side-valve design is the relatively inefficient shape of the combustion chamber; but there remains potential for squish to promote turbulence of the fuel/air mix, and the low rpm means that the flame front is able ignite all the fuel in each power stroke.〔http://myweb.tiscali.co.uk/speedex/index_files/Page2476.htm〕〔http://www.secondchancegarage.com/public/585.cfm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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