Mxsmanic wrote in message
...
Stan J. Lefosi writes:

will you enter earth´s orbit?

If you mean a stable orbit that decays only very slowly, you need to get
above the atmosphere to achieve that. This implies that you need a
spacecraft rather than an aircraft. Aircraft require air for their
engines, and for the aerodynamic phenomena that provide lift to keep
them suspended in the air. Beyond a certain altitude (usually from
30,000-90,000 feet, depending on the aircraft), there isn't enough air
to maintain lift and/or power the engines, and so you can't go any
higher than that, which prevents you from reaching a stable orbit (you
can still go into orbit at lower altitudes, but friction from the air
will cause your orbit to decay almost immediately).

You also need to be going very, very fast. Fast, as in 17,000mph fast.
Mach 25 fast. Basically, during a rocket launch, your spacecraft starts out
going almost straight up. It does this to get out of the atmosphere (which
would cause drag and heating and other nasty effects), and then pitches over
so it's basically flying horizontal. This is where all the speed is
required, and once your orbit is circular, you shut off the engines. From
there, you can change your orbit by using the engines in bursts (called
"burns"), the direction of which is specified by the laws of physics.