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Old 12-18-2009, 08:04 PM   #21 (permalink)
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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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Old 12-18-2009, 08:24 PM   #22 (permalink)
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Old 12-19-2009, 02:17 PM   #23 (permalink)
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A German company called Zoche has been diddling around with a small (150 HP) radial diesel for light planes for over a decade and is getting nowhere against the US regulatory apparatus.
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Old 12-20-2009, 09:53 PM   #24 (permalink)
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Here's Zoche.

zoche aero-diesels homepage

Over the years their 150 HP three cylinder became a four and their 300 HP engine went from a seven to an eight cylinder. Plus they added a two-cylinder with less power. Their site does not claim a Part 23 certification.

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