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Showing results for tags 'exhaust stack'.
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Here is an interesting paper on optimising a piston engine exhaust stack for thrust. Here is another and another. Between using the exhaust stack for direct thrust and things like the meredith effect, it seems that a small but significant fraction of the thrust produced by a piston aircraft ends up coming from things other than the prop. All of which makes me wonder: what would happen if you decided to ditch the prop alltogether (or at least reduce it to a first compressor stage/something to keep the radiator running). What would a piston engine designed to produce thrust mainly from the exhaust look like?