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There are certainly diesel powered aircraft, such as the one mentioned by sappersgt. I was talking to an aviation mechanic last week, he's heading to Africa in a few weeks to maintain a fleet of airplanes for a missions organization, and they have several diesel airplanes. As for why there aren't more of them, I dunno. Power to weight ratio, perhaps? Your suggestion about rpm maybe close to the mark. Diesel engines are big on torque, less on hp. I might be able to ask my mechanic friend.
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