This [1] forum post on nasaspaceflight.com says at stage 1 cutoff, velocity is 2,531 m/s (mach 6.76) and altitude is 84.1 km. The actual deceleration burn start

This [1] forum post on nasaspaceflight.com says at stage 1 cutoff, velocity is 2,531 m/s (mach 6.76) and altitude is 84.1 km. The actual deceleration burn starts 12 seconds after that, when the stage has coasted up to nearly 100km and has slowed (slightly) to 2,479 m/s. I don't think (?) this altitude and speed requires heat shielding for the 1st stage. The 2nd stage is jettisoned far too fast and high to make recovery feasible (for now!). [1] http://forum.nasaspaceflight.com/index.php?topic=27748.690 http://forum.nasaspaceflight.com/index.php?topic=27748.690