KL808
Topic Author
Posts: 1534
Joined: Thu May 20, 1999 3:49 am

Aircraft Design

Mon Mar 10, 2003 9:37 am

why do supersonic jets like the concord have their front end pointed while all subsonic commercial aircraft have theirs blunt and not pointed ?

why not make subsonic aircrafts with pointed ends?

will this make any difference. does this have to do with drag?

thanks

drew
AMS-LAX-MNL
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: Aircraft Design

Tue Mar 11, 2003 9:38 am

Advances in aerodynamic technology and knowledge.
Look at the space shuttle and read what speeds that thing operates at in the lower altitudes.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
prebennorholm
Posts: 6444
Joined: Tue Mar 21, 2000 6:25 am

RE: Aircraft Design

Wed Mar 12, 2003 9:07 am

Also wing leading edges and all other subsonic streamlined bodies have a rounded front. It gives the lowest drag.

Here comes in very, very layman's term a few lines about a subject which fills hundreds of books.

A body traveling through the air sends a "warning" forward telling "here I come". That warning travels at sonic speed since it is in fact the same air pressure disturbance as sound is.

When traveling at supersonic speed, then the body always flies ahead of the warning. Therefore entirely different physical laws apply, and the body virtually has to slice its way through the air as a knife.

But go to the public library and borrow one of those books, the thicker the better.

The Space Shuttle (and all other re-entry vehicles including warheads on intercontinental ballistic missiles) are different animals. Internal heat distribution is more important than lowest possible drag, because a pointed nose would always burn away. Therefore the rounded shape.
Always keep your number of landings equal to your number of take-offs

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