The latter’s creative spark was the SR-71 “Blackbird” spy plane, and that paradigm-shifting aircraft has recently been the catalyst for another marque’s model, one developed to exist in the rarefied air of bleeding-edge engineering and design—the Hennessey Blackbird. of his eponymous Hennessey Special Vehicles, has been on a 35-year mission to not only push the envelope, but tear right past it. Hennessey Special VehiclesEven more derivative of the SR-71 are the active vertical stabilizers at the back. Click here for more photos of the Hennessey Blackbird. Hennessey Special Vehicles