Talk:Reaction engine

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[edit] Pump-jets

Would it be correct to add water pump-jets as examples of reaction engines? The Jet-ski (and equivalent) uses a pump-jet for propulsion, i.e. it obtains thrust in reaction to the ejected stream of water. But then this is really so different from a propeller on a shaft external to the engine? (Sdsds - Talk) 18:58, 26 May 2007 (UTC)