Testflight

I heard Nasa are testing the scram Jet mach 7 machine soon.
It is supposed to such oxygen out of the atmosphere at some 10's of
thousands of meters altitude.
Is there really enough oxygen out there to do that?

K. Larsen

K. Larsen wrote:
I heard Nasa are testing the scram Jet mach 7 machine soon.
It is supposed to such oxygen out of the atmosphere at some 10's of
thousands of meters altitude.
Is there really enough oxygen out there to do that?

The atmosphere is pretty much homogenous up to much higher altitudes
than that.

"K. Larsen" wrote

Is there really enough oxygen out there to do that?

K. Larsen

Apparently, yes. :-)

For more information [than you probably care to read] go he

http://www.larc.nasa.gov/reports/reports.htm

Type "hyper" into the LTRS search field.

Jon

"K. Larsen" wrote in message news:Ia%8c.6471$EV2.55040@amstwist00...
I heard Nasa are testing the scram Jet mach 7 machine soon.
It is supposed to such oxygen out of the atmosphere at some 10's of
thousands of meters altitude.
Is there really enough oxygen out there to do that?

K. Larsen

See BBC World Service, it flew, and did its job.

You should think of that the craft is flying fast *before* ignition,
so that it scoops up a lot of the atmosphere per second.

And it probably compresses it, by the ram effect, so that there is
enough oxygen.

Regards

Carsten Nielsen
Denmark

"K. Larsen" wrote in message news:Ia%8c.6471$EV2.55040@amstwist00...
I heard Nasa are testing the scram Jet mach 7 machine soon.
It is supposed to such oxygen out of the atmosphere at some 10's of
thousands of meters altitude.
Is there really enough oxygen out there to do that?

The air is thin if you're standing still. If you're moving 5000mph,
you can ram a lot of that thin air into an engine's inlet every
second. Just imagine covering more than 2000 meters every second. Even
in air less than 1/100th as thick as sea level air, that's a lot of
oxygen getting into the engine.

Mike Miller, MatE