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The attitudes through the thread are that gas sped only really slows when hitting a turbine, but not for a heat-exchanger.
I'm not saying that's wrong, but I just don't get why folks think (or seem to imply) that a heat-exchanger in which the exhaust-gas temperature drops considerably does not also look like a major restriction (hence back-pressure) to the engine? ... what am I missing?
Whether a hot, fast-moving gas stream comes up against a whizzing impeller, or it travels through a tube-boiler (or similar) the gasflow will be diminished as it exits... won't it?
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