IIRC there was an O3400 flight that did M3.6 (might have been M3.66) back in 2015. That is the fastest I have heard of.
How is the speed of a rocket measured?
Barometric pressure sensors or GPS would be the first things to come to mind.
What about using a Pitot Tube like airplanes use?
Has anyone tried this? What would be the advantages and disadvantages?
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