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Several years ago, some rotary users tried various flattened exhaust tips, as seen on a lot of European homebuilts. (Supposed to help with making exhaust tone less irritating.) IIRC, everyone found that the rotary would destroy the tips very quickly. Well, while walking through the Fantasy of Flight museum about a week ago, I noticed these tips on (IIRC) a P-40. Looks like they maintained a curved shape but were still able to have the pinched outlet. Don't know if it would actually work with a rotary, but it should have a better chance than the purely flat tips.
Charlie
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