Hmmm, that’s pretty amazing, how perpendicular the shock waves emanate from the front of the aircraft. I wonder at what speed they propagate, the speed of sound? Looks like it would have to be much faster due to the slight angle of the bow wave.
Great screen backgrounds. I have hundreds that just cycle through.
Interesting how they interfere with each other.
https://www.thenakedscientists.com/articles/questions/what-produces-lift-during-knife-edge-pass
from link:
When an airplane does a knife-edge pass (wings vertical), where is the vertical component of lift coming from to keep it in the air?
Thanks!
Cameron
Answer
Dave - So, the plane is basically flying on its side. The wings can’t be doing anything because they’re vertical. So, the lift must be coming from somewhere else. When you watch them doing it, they’re actually quite a big angle. So, they’re not flying horizontally. They’re sort of flying at 20 or 30 degrees to the vertical. And so, you’ll be getting some lift from the side of the body of the plane, from the side of the fuselage. Some from the tail plane itself will be giving you some lift and mostly, the kind of planes which do this have got very, very large propellers which can throw an awful lot of air backwards. So, because the plane is pointing upwards, that air is being thrown downwards, and so you get an equal opposite reaction and the plane gets pushed upwards.
NASA Captured Two Jets' Supersonic Shockwaves Merging By Applying New Tech To An Old Idea
NASA's new very high-speed camera paired with the 'Schlieren' photography concept will help in the development of practical supersonic air travel.
By Joseph Trevithick March 6, 2019
