dhaughton99 wrote: »
A Virgin Atlantic flight from Los Angeles to London peaked at a whopping 801 mph Monday evening 35,000 feet over Pennsylvania. "[N]ever ever seen this kind of tailwind in my life as a commercial pilot," tweeted Peter James, a jet captain.https://www.washingtonpost.com/weather/2019/02/19/flight-reaches-mph-furious-jet-stream-packs-record-breaking-speeds/?noredirect=on&utm_term=.79a92e2d5f7a
Franz Von Peppercorn wrote: »
Isn’t that supersonic?
... you might notice something suspect about the 801 mph reading — it’s above the speed of sound (767 mph). However, whether air travel breaks the sound barrier is dependent on its airspeed — not its ground speed .........................
In other words, an airspeed exceeding the speed of sound was not attained. Commercial aircraft are generally not designed to fly at supersonic speeds.
banie01 wrote: »
Yep, one would wonder what the effect of a tailwind assisted speed would have on Mach number and compressibility?
faoiarvok wrote: »
The aircraft is moving in a stream of air that is moving in (generally) the same direction as it, so the true airspeed is basically the ground speed minus the tailwind.