[Cycle]

The wake is a low pressure area, yes? So filling that low pressure area with air to raise the pressure should minimize the wake and thus wake drag, yes? Now, if we got that air from the front of the vehicle, and used the vehicle exhaust to "pump it" (via a Coanda nozzle) into the wake of the vehicle, would we not be using otherwise wasted energy (the exhaust) to not only fill the wake with hot air (reducing wake drag), but to grab some of the air at the front (reducing frontal pressure drag)?

In my case, the air will be scooped at the stall point at the front of the bike, run through the engine compartment to cool components there, then exhausted into the wake by being "pumped" through the Coanda nozzle. I got the idea from John Britten putting the radiator air and engine exhaust into the wake of his superbike, and racers tilting their muffler exhaust tips to fill the wake, giving them a bit more speed.

The Coanda nozzle is there to get the air moving faster, and to pump air through the engine compartment (which will be closed and separate from the rider space for sound isolation) even when the bike is stopped. The air flow coming off a Coanda nozzle is pretty smooth, as can be seen in the Dyson bladeless fan.