It seems to me aviation diesels have been in development for as far back as I remember in hopes of taking advantage of lower cost and highly available Jet-A fuel. Applications seem to be limited to retrofits into STC'd airframes (FAA-approved replacements of avgas piston engines).
Lycoming IO-720 400 hp Diesel
Economic Comparison of a 200 hp Diesel to an IO-360 200 hp Lycoming
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Any sufficiently advanced technology is indistinguishable from magic. - Clarke's Third Law
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