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RE: Gas Turbine returns to automotive use

What hurts ALL I/C engines is that you need what in stereo or hifi would be 'dynamic range'.

Automotive diesels, for example, can have a flat torque peak from 1500 to 3500 rpm or more.
This allows very high gearing for maximum economy.

An Engine DESIGNED for maximum volumetric efficiency at a very small range of speeds, and used to drive a genset (alternator?) can have even HIGHER economy. It doesnt' have to be very useful at the speed range expected of an engine GEARED to the wheels.
Too much is never enough


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