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Yes, the claim is that the hot air expanding out behind the intake created thrust. Problem is, you would need a converging diverging nozzle - like a rocket engine has - in order to do that.
And if you have something sticking out into the airstream, you have a low pressure area behind it.
That's what I meant.Do Reno racers dump it?
The Meredith effect doesn't produce more thrust than the drag of the system, but it does offset some of the drag.
Some Reno racers delete the radiator for a total loss system, and remove the cooling drag completely.
Except the outlet is not expanding, but converging.
The air velocity is slowed in the inlet, and increased at the outlet.
The duct is a divergent-convergent type, as the flow is subsonic.
Ramjets are convergent-divergent type ducts for supersonic flow.