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  #1  
Old 06-14-2007, 06:39 AM
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supersonic, Sydney-London in 2 hours


In this undated handout artist's rendition released by Japan Aerospace Exploration Agency (JAXA) in Tokyo, a supersonic aircraft, piggybacked on a rocket, flies in the sky. The Japan's space agency plans to launch the arrow-shaped airplane at twice the speed of sound high over the Australian outback as early as September, 2005 in a crucial test of the country's push to develop a supersonic successor to the retired Concorde. (AP Photo/Japan Aerospace Exploration Agency, HO). Click to enlarge
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Old 06-14-2007, 06:41 AM
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Woomera, Australia

Scramjet launch scrubbed once again

June 14, 2007 - 8:21PM

An attempt to launch a supersonic scramjet engine in Australia's outback was aborted just five seconds before lift-off.
Strong wind gusts forced the late cancellation of the test of the scramjet at Woomera in South Australia's north.
It was the second consecutive day that strong winds had caused the cancellation of the test of the engine, which scientists ultimately hope will propel the next generation of supersonic aircraft.
The test is being overseen by the Australian government's Defence Science and Technology Organisation (DSTO).
DSTO spokesman Steve Butler said another attempt would be made on Friday.
In March last year, a rocket carrying a scramjet - an air-breathing supersonic combustion ramjet engine - was successfully trialled at Woomera, travelling at 8,000km/h, about 10 times the speed of a conventional jet.
2007 AAP

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Old 06-14-2007, 09:08 AM
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Look, it's a bullet train with wings!

By the time they get that thing working, somebody else will have invented a working transporter module and we'll all be beaming up and down to wherever we need to go.
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Old 06-14-2007, 09:59 AM
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There aren't any windows....

nice avatars rondo-
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Old 06-14-2007, 11:03 AM
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Quote:
Originally Posted by Mistress View Post
There aren't any windows....

nice avatars rondo-

Yep....It looks like a military application to me.....

Hey Mistress........Just curious....why do you think rondos avatars are cool?..
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Old 06-15-2007, 12:38 AM
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I'm trying to scare everybody with my avatars ....

Well, I was just thinking, 2 hours from Sydney to London, how might that
feel!?

Or, which body part arrives first ...?
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Old 06-15-2007, 12:45 AM
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Twice the speed of sound won't get one from Sydney to London in 2 hours.
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Old 06-15-2007, 12:53 AM
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So, how many Machs do we need to make it in a couple of hours?
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Old 06-15-2007, 01:12 AM
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10562 miles. Line of sight. Depends on the altitude for Mach speed. Looks like 12 or so. That's FAST.
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Old 06-15-2007, 01:15 AM
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Science Pictures

Airflow around the Hypersonic Vehicle JAPHAR


copyright ONERA 1996-2006 - All rights reserved
Numerical simulation of the airflow around hypersonic vehicle JAPHAR
(DPRS)
Many hypersonic vehicles have flown: when not powered, they are atmospheric reentry bodies. Powered, they are the scramjet-powered launch vehicles used since the begining of space conquest. The problem with the scramjet is that you have to carry large quantities of both fuel and oxidizer.
An airbreathing engine* burns oxidizer scooped up from the atmosphere rather than carried on board. As a result, the payload is increased and the launch costs are lower. Ramjets**, relatively simple engines with no moving parts, are airbreathing engines. The principle was devised by the French engineer Lorin in 1913. Currently, ramjets are used operationally only to power cruise missiles, like ASMP cruise missiles, around Mach 3.
Airbreathing Propulsion
The flight is supersonic at speeds approaching Mach 4 or 5, hypersonic above. The transition from supersonic to hypersonic flight is not brutal, but continuous.
For an airbreathing propulsion system, the transition from supersonic to hypersonic flight has important consequences. When a ramjet flies at supersonic speed, the internal airflow remains subsonic because it has to be slowed down to reach the high temperatures and pressures required. At higher speeds (Mach 6/7), the slowdown of the internal airflow causes a dramatic increase of the losses: the air is too hot and the engine no longer works efficiently. The best solution is to slow down the airflow, but not under supersonic speeds (Mach 2 to 3): you have a ramjet with a supersonic combustion process or scramjet***.
With a subsonic internal flow, the air does not stay long enough in the combustion chamber for the combustion to be complete. If the internal flow is supersonic, the air is not as much slowed down: it is colder and the fuel stays very little time (1 millisecond) in the combustion chamber. In this period of time, the fuel has to be mixed with the air and the reactions have to be completed before the coming out of the engine.
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Old 06-15-2007, 01:20 AM
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Quote:
Originally Posted by diametricalbenz View Post
10562 miles. Line of sight. Depends on the altitude for Mach speed. Looks like 12 or so. That's FAST.
I see, supersonic is not enough, we've got to go Hypersonic.

Makes me think of a Double Shot Espresso, as a sleeping dose ...
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Old 06-15-2007, 01:27 AM
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How fast did Chuck Yeager go in the X-1?
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Old 06-15-2007, 01:53 AM
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Slightly over the speed of sound.
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  #14  
Old 06-15-2007, 01:59 AM
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F/A-18 Sonic Boom


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Old 06-15-2007, 03:46 AM
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Originally Posted by Chas H View Post
Slightly over the speed of sound.
Didn't he reach Mach 4 or 5 at some point in another vehicle or run?
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