sudden
Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

Supersonic.

Fri Nov 09, 2001 8:30 pm

My question is if only Concorde is able of going Mach1?
Would, lets say, a 747 or 737 be able to do it if it had the engines for it, or would the structure of the A/C brake up?

If it would brake up, what is the difference between Concordes structure and other A/C's?

Thank you.
When in doubt, flat out!
 
L-188
Posts: 29870
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RE: Supersonic.

Fri Nov 09, 2001 10:52 pm

It really isn't a structural issue as opposed to an aerodynamic one.

True there are some structural features to deal with the heat generated by supersonic flight. The big issue is that you want to try and get the airframe to fit inside the "cone of the shockwave". It is a lot less draggy on the airframe if you do that.

That is one of the reasons that supersonic aircraft in general have those really long pointy noses. An aircraft with a blunter nose can't get it's airframe within the shockwave so it would need much more power to exceed the speed of sound.
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Ikarus
Posts: 3391
Joined: Mon Jan 08, 2001 10:18 pm

RE: Supersonic.

Fri Nov 09, 2001 11:42 pm

It is a question what a plane is designed to do. As mentioned, a blunt airliner would not fit the fuselage and wings behind the generated shockwave. It would also create a normal shockwave significantly in front of the nose, and not an oblique shock at the nose, which would result in far more energy being lost and hence drag. Furthermore, a subsonic airliner flying supersonically is not easily controllable. It is not designed to be controllable at supersonic speeds. The loads on the airframe would be higher, but for a short period of time it is survivable (eg the China Airlines 747SP, or the new Bombardier regional Jet, both of which survived supersonic flight for a short time - but as far as I can remember, the 747 suffered structural deformations). In general, a subsonic airliner accidentally going supersonic will be very hard to control, and it will quickly lose velocity due to the substantial increase in drag, and become subsonic again.

What is different about Concorde? The aerodynamic shape. The materials - it is far more heat-resistant. It is optimised for supersonic flight at the design stage.

Regards

Ikarus
 
sudden
Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

RE: Supersonic.

Sat Nov 10, 2001 12:03 am

Very interesting. Thanks alot.
When in doubt, flat out!
 
sudden
Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

RE: Supersonic.

Sat Nov 10, 2001 12:19 am

I have had the pleasure to see (on film) how it looks when a aircraft brakes the soundbarrier on low altitude over sea. That was really something!
When in doubt, flat out!
 
lehpron
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RE: Supersonic.

Sat Nov 10, 2001 5:17 pm

Isn't Concorde also made of the same Aluminum alloy 6076(?) as any other subsonic a/c proving the maximum possible speed of aluminum planes to be M2.00?
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sudden
Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

RE: Supersonic.

Mon Nov 12, 2001 6:43 pm

I also learned from looking at Discovery this weekend, that if you would try to go supersonic with a plane like the 747 for ex. the shockwave would bouns of the nose and then hitting the wings, making the A/C crash.
When in doubt, flat out!

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