- PSA: Supersonic skydive from 120,000ft. Live online this afternoon
so, while he may, whilst at altitude, travel faster than sound does at sea level, he still wont technically be supersonic, is that correct?
They seem to be expecting his max speed to be about the same as sound at sea level (340m/s) or maybe a bit faster after thirty seconds or so of free fall.
At jump altitude the speed of sound is around 315m/s and on the way down it actually decreases to start with… so he should definitely be supersonic “locally” as it were.Posted 5 years agoGotamaMember
Just in the travelling supersonic debate…..the comment i heard on radio 4 this morning stated that one of the key concerns was the impact on felix when going through the sound barrier (sonic boom or is that just phrasing rather than actual effect?) could cause him to spin out of control….which would imply they are expecting him to break the sound barrier and the issues associated with that rather than a theoretically breaking it.Posted 5 years agoellipticMember
one of the key concerns was the impact on felix when going through the sound barrier (sonic boom or is that just phrasing rather than actual effect?) could cause him to spin out of control.
All sorts of nasty aerodynamic stuff happens at transonic speeds…hence it was such a big deal figuring out how to design aircraft to handle it.
OTOH he’s up in such thin air that the shock forces etc will be correspondingly reduced, presumably its not going to be anywhere near as bad as going supersonic at sea level.
The sonic boom is just the compressed shock wave you’re pushing out around you, which can’t escape out in front fast enough….the aerodynamics get weirdest when you’re just below/above the speed of sound so you’re stuck right in the shock wave with airflow that’s varying from subsonic to supersonic in different areas around the airframe (…or indeed, body).Posted 5 years agoMidlandTrailquestsGrahamMember
There’s a bit about the speed of sound stuff here. http://www.redbullstratos.com/science/speed-of-sound/
One of the things I find odd, looking at the technical details, is the use of imperial measurements.Posted 5 years ago
I know the USA hasn’t caught up with the rest of the world in that respect yet, but I still can’t get used to the idea of reading about cutting edge technology in terms that I associate with steam engines and vintage vehicles.druidhMember
Another hour or so before the jumpPosted 5 years ago
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