Tesla's new Roadster is inspired by a spy plane the CIA built with metal it secretly bought from the Soviet Union, the same country the plane was spying on. The other jet Tesla named, the F-35, got its shape from a Soviet scientist too. Between them, those two jets explain every hard edge on this car. The spy plane is the SR-71 Blackbird. Its airframe was around 85 to 93% titanium, and the US didn't have nearly enough of the stuff. The Soviets did. So the CIA set up a web of shell companies…