The Cirrus stall-crash has resulted in related discussions about the relative safety of steep bank angles while descending. Paul says step bank angles can be made with relative impunity from stalls if descending. With due respect I join the dissenting side.
In November 1945, a British jet fighter the Gloster Meteor set a new official world speed record of 606.25 mph. It was two years later before the sound barrier was broken by an American aircraft the Bell X-1. Test pilot 'Chuck' Yeager named the aircraft 'Glamorous Glennis' after his wife.
The Saturn V reached 400 feet per second (120 m/s) at over 1 mile (1,600 m) in altitude. Much of the early portion of the flight was spent gaining altitude, with the required velocity coming later. The Saturn V broke the sound barrier at just over 1 minute at an altitude of between 3 and 4 nautical miles (5.5 to 7.4 kilometers).