As fast as a speeding bullet.
12-13-2002, 05:31 PM
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As fast as a speeding bullet.
Last edited by PhantomChaos; 12-13-2002 at 05:36 PM.
12-13-2002, 05:57 PM
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Thanks, but someone sent me this stuff and figured you guys would enjoy.
That vapor happens when a plane breaks past the speed of sound. He was obviously on the edge. You can see it starting on the leading edge of the wing in the fifth photo down.
That vapor happens when a plane breaks past the speed of sound. He was obviously on the edge. You can see it starting on the leading edge of the wing in the fifth photo down.
12-13-2002, 07:35 PM
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Garshev
It is a “Transonic condition” where the Air temperature, density, and the moisture present are just right.
What you saw was the initial shock wave, a very momentary condition and after that the aircraft is enveloped in the sonic flow around the plane or sonic cones that are very angular (kind of like a drinking cup with the nose of the aircraft at the point) very cool video and hard to come by !
It is a “Transonic condition” where the Air temperature, density, and the moisture present are just right.
What you saw was the initial shock wave, a very momentary condition and after that the aircraft is enveloped in the sonic flow around the plane or sonic cones that are very angular (kind of like a drinking cup with the nose of the aircraft at the point) very cool video and hard to come by !
12-13-2002, 08:49 PM
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Close, but I don't think we're seeing a shockwave birth. If you look you will notice several things.
1) nothing happening around the nose of the plane
2) nothing around the elevators
3) nothing happening below the wing.
Also notice the angle of the elevators - hard "up" direction.
I'm gonna say that we are seeing the water "boiling" out of the air above the wing due to extremely low pressure.
Looks like the plan is in a high-G pullup which is loading the BOTTOM of the wing with 6-to-9 times the weight of the plane (actually MORE than that since the elevators are pushing DOWN and that load must be factored in as well). This means that the air pressure above the wing is 6-to-9 times LOWER than atmospheric.
Everybody knows that water boils at a lower temperature at high elevations (lower air pressure). Also know that water boils at a higher temp with increased pressure (radiator).
I say that the pressure above the wing is low enough that the moisture present is falling out of solution with the gases in the air (or boiling).
1) nothing happening around the nose of the plane
2) nothing around the elevators
3) nothing happening below the wing.
Also notice the angle of the elevators - hard "up" direction.
I'm gonna say that we are seeing the water "boiling" out of the air above the wing due to extremely low pressure.
Looks like the plan is in a high-G pullup which is loading the BOTTOM of the wing with 6-to-9 times the weight of the plane (actually MORE than that since the elevators are pushing DOWN and that load must be factored in as well). This means that the air pressure above the wing is 6-to-9 times LOWER than atmospheric.
Everybody knows that water boils at a lower temperature at high elevations (lower air pressure). Also know that water boils at a higher temp with increased pressure (radiator).
I say that the pressure above the wing is low enough that the moisture present is falling out of solution with the gases in the air (or boiling).
