Very cool:

YouTube - RC SR-71 JET

Apparently built by a German. Looks to me that the engine is in the fuselage and the exhaust is out the tail "cone." Not sure, but I think he used the engine nacelles to duct the air to the fuselage (through the wings) for the real engine (the inboard wings seem too thick and blocky). Cockpit/canopy seems slightly too big for scale, too.

But it flies very convincingly!