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A fact from Charomskiy ACh-30 appeared on Wikipedia's Main Page in the Did you know column on 28 October 2009 (check views). The text of the entry was as follows:
I have fixed the explanation of the motorjet setup, as it was incorrect. A motorjet is a jet engine with a compressor driven by a separate piston engine (instead of a turbine powered by the jet engines own exhaust stream as in a turbojet...hence the "turbo" part). The existing sentence said that the compressor was "driven by the turbochargers of a separate piston engine", which is obviously not logical....what does the piston engine itself power then? Perhaps the person who wrote that was confused with a turbo-compound engine, where there is a small turbine that extracts some of the waste energy from the exhaust and returns it the the crankshaft of the piston engine itself...a power-recovery device, in other words. Even on motorjet aircraft designs that powered a conventional propeller the engine itself also powered the compressor...an exhaust driven turbine could not be powerful enough to power any useful sized compressor. A jet engine needs a lot more air, compressed a lot more, than a turbocharged engine takes. Waste exhaust from a piston engine could not supply that kind of energy (unless you were using a very large engine and turbine)..45Colt 21:25, 9 February 2014 (UTC) — Preceding unsigned comment added by .45Colt (talk • contribs)
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