Amer­i­can com­pany En­gi­neered Propul­sion Sys­tems’s Graflight diesel has some Ger­man roots and, af­ter a decade of in­ten­sive devel­op­ment where more than $20 mil­lion was in­vested and af­ter the lat­est cash in­jec­tion from China, FAA cer­ti­fi­ca­tion seems al­most cer­tain in this year. Ac­cord­ing to EPS, the eight­cylin­der unit is a clean-sheet de­sign that uses state-of-the-art pro­duc­tion tech­nolo­gies. The 4.3 litre ‘V8’ en­gine has an un­usual cylin­der an­gle of 180 de­grees, mak­ing it a flat eight. De­pend­ing on the ver­sion, the power out­put is 320 to 420hp. As de­liv­ered to first cus­tomers for test­ing and in­stal­la­tion devel­op­ment, the 380hp A43 it­er­a­tion weighs around 35kg more than the Ly­coming TIO-540 gaso­line en­gine of the same power. EPS en­gines are de­signed to fit ex­ist­ing O-540/550 en­gine mounts and weight en­velopes. Liq­uid-cooled, tur­bocharged, in­ter-cooled en­gine and fit­ted with a PSRU, the en­gine is man­aged by a dual-chan­nel elec­tronic con­trol sys­tem from Bosch (EECU) and has, of course, sin­gle-lever en­gine/pro­pel­ler con­trol. The TBO should ini­tially be around 1,500 hours, but in the long term EPS is aim­ing for 3,000. https://eps.aero

320 to 420hp from an all-new flat eight

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