Avaruussukkula Endeavour Yucatanin niemimaan päällä, korkeutta noin 70km, nopeus noin mach 20. Ei yhtä dramaattinen ääni kuin lähempänä floridaa, mutta täysin selvästi shokkiaalto muodostuu jo noissa korkeuksissa. Kohdassa 1:04.
Tässä muuten wewbistä kaappaamaani sukkula dataa;
The shuttle usually operates at an orbital altitude of between 200 and 350
miles (careful! NASA often uses nautical miles for shuttle statistics),
depending on what the mission and payload requirements for the flight are.
A circular orbit at these heights implies an orbital speed of about 17,000
miles per hour. If the orbit is elliptical, the speed will be slightly
higher, but not by much.
But how does the shuttle "de-orbit?" Basically, it has to change from
flying like a spacecraft into flying like a missile, and then finally into
flying like a glider. The trick is not to lose control during any of these
stages, because what you do early on narrows your choices later! The
first thing is to turn around so that the rear engines are facing in the
direction of flight. The deorbit burn is a 2-1/2 minute firing of the
Orbital Maneuvering System engines, which sit in those big bumps on either
side of the shuttle's tail. Now here's the strange part -- firing
backwards lowers the height of your orbit on the other side of the world!
It seems totally counter-intuitive, but since you are operating in a
constrained system, there are some interesting things that happen. If you
want to climb higher, you wait until you are on the opposite side of the
world, and fire backwards. If you want to speed up, you fire the engines
facing the stars, and if you want to slow down, you fire the engines
facing the Earth! No wonder those pilots need so much training!
One-half orbit after the deorbit burn is completed, the shuttle will have
dropped to an altitude of 557,000 feet and be about 5,000 miles from the
landing strip. At this point, it is still going about 17,000 miles per
hour, but there is not enough air at this height for flying. The shuttle
has to drop to 400,000 feet before it can start to use its control
surfaces, still going at a speed of between 16,700 and 17,000 miles per
hour (since there is nothing to brake against yet). This is still so fast
that the shuttle begins to really heat up as it smashes into the air
molecules faster than they can get out of the way. Between 265,000 feet
and 162,000 feet altitude it is still going so fast that it actually
knocks the electrons off some of the molecules, creating an ionized gas
cloud that causes a 16 minute-long radio blackout. If you are lucky enough
to see it go by at this stage (perhaps if you live in the Midwest, and the
landing is targeted for Florida), you will see a fireball streaking
through the sky. When the shuttle is about 60 miles from the runway, it
starts a series of S-turns that slow it down from 1,700 mph and drop it
from 83,000 feet. Finally, at about 25 miles from the runway and 49,000
feet altitude the shuttle drops below the speed of sound (this is about as
high as regular jets fly). When it is about 8 miles from the runway, it is
still at 10,000 feet, doing about 330 mph which is about twice as fast as
a jet, and 10 times as high. The view from the cockpit at this point is
pretty scary for a regular pilot – your brain just screams at you that you
are coming in WAY too steep and fast. To overcome this fear, shuttle
pilots do a lot of training in specially modified airplanes that behave
like the shuttle during this very last phase of landing.
I hope this helps.
Eli sukkula alkaa lähestyä ilmakehää 5 000 mailin päässä kentästä eli 8045 km.
Elikkäs 1227 km Cape Canaveralista on Merida Yucatanilla..ja videoltakin näkyy että hehku loppuu videon lopulla jolloin ollaan alle 48 km korkeudessa. Ehkä videon alussa 55-60 km.
http://64.130.3.227/worldclock/distances.html?n=2273&continent=africa
Voi olla mahdollista että sukkulan ääni ei kuulu vielä Amazonilla 7 000 kilsan päässä koska ilma on hyvin ohutta siellä ylhäällä.
Tässä vielä MACH 2 korkeus 85 000 ft.
Huima laite;
