Comments on: Hypersonic Jet Screams Through the Stratosphere at Mach 5 http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/ Mon, 22 Apr 2013 21:34:00 +0000 hourly 1 http://wordpress.org/?v=3.4.2 By: Craig porter http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19412 Craig porter Thu, 16 Feb 2012 17:37:11 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19412 At 70000 ft that is. (662mph)/60mins/60sec= 0.184 miles/second At 70000 ft that is. (662mph)/60mins/60sec= 0.184 miles/second

]]> By: Craig porter http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19411 Craig porter Thu, 16 Feb 2012 17:36:16 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19411 Speed of sound, Metric - 1067km/h, 296.4m/s Empirical - 662mph, 970.9 ft/s Speed of sound,
Metric – 1067km/h, 296.4m/s
Empirical – 662mph, 970.9 ft/s

]]> By: Sum Gai http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19410 Sum Gai Mon, 31 May 2010 21:47:21 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19410 Nice to see new technology in action! It was a flawless launch and a good flight. However... Did they have to have the winner of the "Darth Vader sound-a-like" contest as the narrator?!?!? Nice to see new technology in action! It was a flawless launch and a good flight.

However…

Did they have to have the winner of the “Darth Vader sound-a-like” contest as the narrator?!?!?

]]> By: Ron Bennett http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19409 Ron Bennett Sun, 30 May 2010 19:19:26 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19409 Great simulation, although this is several decades away from any commercial use as was the jet engine before its first commercial flight, it does show the hype of the scramjet over the last several decades is now starting to pay dividends. History of the jet engine: “Examples of this type of design were Henri Coandă's Coandă-1910 aircraft (first jet-propelled aircraft ever built, with the first flight on 16 December 1910), and the much later Caproni Campini N.1, and the Japanese Tsu-11 engine intended to power Ohka kamikaze planes towards the end of World War II. None were entirely successful and the CC.2 ended up being slower than the same design with a traditional engine and propeller combination.” “In 1913 René Lorin came up with a form of jet engine, the subsonic pulsejet, which would have been somewhat more efficient, but he had no way to achieve high enough speeds for it to operate, and the concept remained theoretical for quite some time.” http://en.wikipedia.org/wiki/Jet_engine Imagine traveling mach 6 in a commercial airline 80,000 feet above the surface of the earth. In a three hour flight you can go anywhere in the world, depending on what direction you go and there's no traffic up that high yet. With the speeds and the efficiency only getting better who knows theatrically scramjets can travel up to mach 15 which would mean a commercial flight anywhere in the world with an approximate one hour flight time. Great simulation, although this is several decades away from any commercial use as was the jet engine before its first commercial flight, it does show the hype of the scramjet over the last several decades is now starting to pay dividends.

History of the jet engine:

“Examples of this type of design were Henri Coandă’s Coandă-1910 aircraft (first jet-propelled aircraft ever built, with the first flight on 16 December 1910), and the much later Caproni Campini N.1, and the Japanese Tsu-11 engine intended to power Ohka kamikaze planes towards the end of World War II. None were entirely successful and the CC.2 ended up being slower than the same design with a traditional engine and propeller combination.”

“In 1913 René Lorin came up with a form of jet engine, the subsonic pulsejet, which would have been somewhat more efficient, but he had no way to achieve high enough speeds for it to operate, and the concept remained theoretical for quite some time.”

http://en.wikipedia.org/wiki/Jet_engine

Imagine traveling mach 6 in a commercial airline 80,000 feet above the surface of the earth. In a three hour flight you can go anywhere in the world, depending on what direction you go and there’s no traffic up that high yet. With the speeds and the efficiency only getting better who knows theatrically scramjets can travel up to mach 15 which would mean a commercial flight anywhere in the world with an approximate one hour flight time.

]]> By: Lee Johnson http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19408 Lee Johnson Sat, 29 May 2010 00:53:17 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19408 Did they recover the scram jet or is it in the ocean. That must be one expensive 3 and 1/2 minutes If it was ditched in the ocean- Did they recover the scram jet or is it in the ocean. That must be one expensive 3 and 1/2 minutes If it was ditched in the ocean-

]]> By: Bob http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19407 Bob Fri, 28 May 2010 15:55:26 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19407 Speed of sound is a bit slower at that altitude than at sea level. Speed of sound depends only on temperature, not pressure, and of course temperature is lower at high altitudes. According to a standard atmosphere calculator: http://www.digitaldutch.com/atmoscalc/ the speed of sound is 971 feet per second at 70,000 feet vs. 1116 at sea level. Speed of sound is a bit slower at that altitude than at sea level. Speed of sound depends only on temperature, not pressure, and of course temperature is lower at high altitudes. According to a standard atmosphere calculator:

http://www.digitaldutch.com/atmoscalc/

the speed of sound is 971 feet per second at 70,000 feet vs. 1116 at sea level.

]]> By: rabidmob http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19406 rabidmob Fri, 28 May 2010 02:24:17 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19406 Since there are 3600 seconds in a hour, it did just a little better than 1 mile/sec. Since there are 3600 seconds in a hour, it did just a little better than 1 mile/sec.

]]> By: Steve http://blogs.discovermagazine.com/80beats/2010/05/27/hypersonic-jet-screams-through-the-stratophere-at-mach-5/#comment-19405 Steve Thu, 27 May 2010 17:44:11 +0000 http://blogs.discovermagazine.com/80beats/?p=15399#comment-19405 What's the speed of sound that high? Did this thing basically travel a roughly a mile per second for 3 and 1/3 minutes? What’s the speed of sound that high?

Did this thing basically travel a roughly a mile per second for 3 and 1/3 minutes?

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