The reason it is not a turbine has everything to do with starting and stopping. Turbines are efficient for continuous run at fairly continuous speed. Steam turbines are efficient because they more fully extract the energy from the steam and leave it in a condensed state. Then it is reheated in stages. None of that is applicable to a small system for frequent start and stop requirements. Startup of a turbine is a time driven process before it can handle a load. The startup torque of this engine is significant and highly beneficial; hence the transmission is a neglible part.
Now, a question: Why aren't you seriously studying this the way a serious engineer would instead of hoping to sound negative?
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