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EDIT: looking for an answer, did not find one.
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Alrighty then, let's speculate.
No drivetrain in a clay model. Not modeling the inflow and outflow of the [gas or electric] cooling will alter the external results.
The air curtain on the tail is shown to work. It is a Coanda nozzle. The retractable spoiler is small enough that I'd call it a Gurney flap.