Vapor/ sound barrier phenomenon

8/14/2011 | self

[1raider1]

Thought this was neat.

[TribalPrincess2U]

Lost interest.

[MCCC]

To really see if the sound barrier has been broken, full motion video must be observed. A still pic won’t let you know if Mach 1 has been reached or exceeded.

As an aircraft passes through trans-sonic flight the center of pressure moves aft and a discernable nose down movement can be observed. This is known as Mach Tuck.

This tuck is often attributed to the early losses of Lear 23 business aircraft and lead to the FAA requiring a two pilot cockpit rule on sweapt wing aircraft and the ‘barber pole’ on the airspeed indicator.

[1raider1]

I believe that the tip of the bullwhip does indeed break the sound barrier.

[Delta 21]

These arent. Sorry, no cars tho.

[Delta 21]

{..points and laughs..}

HA HA

[OregonRancher]

“I’ve seen the same from bull whips on super humid days.”

The crack you hear when snapping a bull whip is the tip
breaking the sound barrier.

[Daffynition]

[JRandomFreeper]

I was wrong, that's a photoshop. It's not rocket exhaust, it's short/soft field landing stuff in the air.

/johnny

[Las Vegas Ron]

LOL, great pic!

[famousdayandyear]

In trans-sonic conditions (Mach .9 - 1.2) shock wave created.

[RedMDer]

Day 45 and the Freepathon is still on. Please donate today.
Click it.

[aruanan]

Every now and then a poster will put up a picture that purports to be of a jet fighter breaking the sound barrier.

And most of those pictures put up have, indeed, been of a jet fighter breaking the sound barrier and not what you're referring to.

[1raider1]

If, as some have replied that the Prandtl-Glauart singularity can occur at well below trans-sonic speed, how can you say by looking at a photograph that the sound barrier is being broken?

[editor-surveyor]

I can recall times when a Tomcat leaving NAS Alameda would literally disappear from view over the bay in its own cloud on a foggy morning.

[editor-surveyor]

You already knew that......

[aruanan]

If, as some have replied that the Prandtl-Glauart singularity can occur at well below trans-sonic speed, how can you say by looking at a photograph that the sound barrier is being broken?

Because those photos were from sites where the details of the photo were published and they were taken as the plane was approaching the speed of sound. Also because of the placement of the phenomenon. There are types of condensation that are observed behind wings or trailing behind wing tips, especially in very humid air. These are not examples of that phenomenon. You can see it in some turbofan engines at take-off. The plane is moving well below the speed of sound, but the blades in the fan are operating at trans-sonic speed.

For instance, if you see anything like this, it is caused by the aircraft approaching the speed of sound:



This is not:

[1raider1]

Oh.

[famousdayandyear]

Re the bottom photo — those are condensation trails. Also often observed flowing from rear wings of Indy-type cars. Re the top photo, I would guess the aircraft has broken M1.0. Below 1.0, conditions are unstable.

[Bean Counter]

http://www.youtube.com/watch?v=HkaeOJTK2g8

[Smokin' Joe]

And then getting better after being dead...

Lots of room for improvement, there.