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Engineers play with them in Europe but US certification is a horrendously expensive process. The volume of sales (light planes start a a quarter mill) doesn't justify millions of dollars for Part 23 certification.
Google "Junkers Jumo 205" Opposed piston diesels. They ran on kerosene to avoid gelling. They were used on a variety of aircrat, includin high altitude reco planes and the"Hindenberg."
All things old are new again.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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