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Want more explaining? Blackbird's sister.
Whoa! And that is what HE wants, too?
On topic, are aircraft velocities limited at low altitude by the density of the atmosphere compared to the craft's service altitude, the lack of certain gases that are beneficial to the engines at low altitudes, or a combination of both? (example: Mirage 5 top speed- Mach 2.2 at service altitude, 863mph at sea level)
To my knowledge, no free CFS programs exist...