While we're off the subject, how much mass-flow is (was) going through the J58 of an SR71 at 80,000' every second, even if it is bowling along at Mach 3? A few ounces, you'd think.
What I find amazing is that, depending on which source you read, the amount of thrust being generated by the inlet at M=3.2 was between 54-80% of the total.
Similarly at this speed, the length of the engine had grown 6 inches and its diameter by 2.5.
During a ground power run at max AB, the exhaust sections reached 3200F and a football pitch length behind the a/c, the exhaust velocities were still 311F and the air was moving at 150kts.
