By Larry Shaughnessy
A test flight of an aircraft designed to whip around the world at Mach 20 failed when the high speeds peeled the skin off the unmanned plane, Pentagon researchers conclude in a long-awaited report.
For nine minutes in August, the Defense Advanced Research Projects Agency flew its Hypersonic Technology Vehicle at speeds reaching 20 times the speed of sound - fast enough to fly from New York to Los Angeles in less than 12 minutes. But then, something went wrong, and DARPA is finally explaining what happened.
"The most probable cause of the HTV-2 Flight 2 premature flight termination was unexpected aeroshell degradation," the research group explained in a new statement on the test flight.
Translation: The unmanned glider was streaking through the atmosphere when its outer skin started to rip off the airframe.
DARPA knew friction from the glider passing through the air so fast would cause it to heat up. It also expected "a gradual wearing away of the vehicle's skin as it reached stress tolerance limits," based on ground tests.
"However, larger-than-anticipated portions of the vehicle's skin peeled from the aerostructure," the statement said. "The resulting gaps created strong, impulsive shock waves around the vehicle as it traveled nearly 13,000 miles per hour, causing the vehicle to roll abruptly."
When that "anomaly" occurred, a safety computer slowed the glider down and it splashed down in the Pacific Ocean, where it's now probably an artificial reef with a moon roof.
The goal of the project is to create an aircraft that can fly anywhere in the world in under an hour to strike a target. The test plane was launched by a Minotaur IV rocket from Vandenberg Air Force Base in California, then separated from the booster and re-entered the atmosphere over the Pacific.
At Mach 20, friction from the surrounding air subjects the vehicle to temperatures of more than 3,500 degrees Fahrenheit (1,925 C).
DARPA said a group of independent experts decided they couldn't have predicted the problem. "The data from second flight revealed that extrapolating from known flight regimes and relying solely on advanced thermal modeling and ground testing could not successfully predict the harsh realities of Mach 20 atmospheric flight," the agency said.
A 2010 test also ended with the craft plunging into the Pacific. In spite of the problems, DARPA said it did learn a lot from the August test.
"We successfully incorporated aerodynamic knowledge gained from the first flight into the second flight," Maj. Chris Schultz, the program manager, said. And future flights will incorporate what was learned in the second test, he said.
Oh my goodness! Awesome article dude! Thank you, However I am experiencing difficulties with your RSS. I donít understand the reason why I can't join it. Is there anybody having similar RSS issues? Anybody who knows the answer can you kindly respond? Thanx!!
Greetings from Idaho! I'm bored at work so I decided to browse your website on my iphone
during lunch break. I love the information you present here and can't wait to take a look when I get home.
I'm surprised at how fast your blog loaded on my mobile ..
I'm not even using WIFI, just 3G .. Anyways, very good site!
After I originally left a comment I seem to have clicked on the -Notify me when new comments are added- checkbox and from now on each time a comment is added I get 4 emails with the same comment. Perhaps there is a way you are able to remove me from that service? Kudos!
Having read this I believed it was very enlightening. I appreciate you taking the time and effort to put this information together. I once again find myself personally spending a significant amount of time both reading and posting comments. But so what, it was still worthwhile!
Very good article! We will be linking to this particularly great post on our website. Keep up the great writing.
This web site truly has all the information I wanted concerning this subject and didnít know who to ask.
I'm extremely pleased to discover this page. I need to to thank you for your time just for this wonderful read!! I definitely loved every little bit of it and i also have you book-marked to look at new stuff in your website.
Hello, I do believe your web site could possibly be having internet browser compatibility issues. Whenever I look at your site in Safari, it looks fine but when opening in I.E., it's got some overlapping issues. I merely wanted to provide you with a quick heads up! Besides that, great website!
This is a good tip especially to those fresh to the blogosphere. Short but very precise infoÖ Many thanks for sharing this one. A must read article!
Very good article! We are linking to this great post on our website. Keep up the great writing.
Good site you've got here.. Itís hard to find good quality writing like yours these days. I truly appreciate people like you! Take care!!
That is a good tip particularly to those fresh to the blogosphere. Brief but very precise informationÖ Appreciate your sharing this one. A must read article!
An outstanding share! I've just forwarded this onto a colleague who had been conducting a little research on this. And he in fact bought me lunch due to the fact that I found it for him... lol. So let me reword this.... Thanks for the meal!! But yeah, thanx for spending some time to discuss this subject here on your internet site.
Excellent blog you have here.. Itís difficult to find quality writing like yours nowadays. I seriously appreciate people like you! Take care!!
Way cool! Some extremely valid points! I appreciate you writing this article plus the rest of the site is also really good.
Good post. I absolutely appreciate this website. Keep writing!
Oh my goodness! Awesome article dude! Many thanks, However I am having problems with your RSS. I donít understand the reason why I cannot join it. Is there anyone else getting similar RSS problems? Anyone who knows the answer can you kindly respond? Thanx!!
There is definately a lot to find out about this topic. I like all of the points you made.
Oh my goodness! Incredible article dude! Thank you, However I am experiencing troubles with your RSS. I donít know why I can't join it. Is there anybody getting similar RSS problems? Anyone that knows the solution can you kindly respond? Thanks!!
Nice post. I learn something new and challenging on sites I stumbleupon everyday. It will always be useful to read through articles from other writers and practice something from their sites.
You are so cool! I don't believe I have read anything like that before. So great to find another person with a few genuine thoughts on this issue. Seriously.. many thanks for starting this up. This site is one thing that's needed on the web, someone with a little originality!
I would like to thank you for the efforts you have put in penning this website. I'm hoping to check out the same high-grade content by you later on as well. In truth, your creative writing abilities has motivated me to get my own, personal site now 😉
I could not refrain from commenting. Well written!
Greetings! Very useful advice in this particular article! It's the little changes that will make the largest changes. Thanks a lot for sharing!
Having read this I believed it was really enlightening. I appreciate you spending some time and energy to put this content together. I once again find myself spending way too much time both reading and commenting. But so what, it was still worth it!
Fastidious answer back in return of this matter with solid arguments and
describing all on the topic of that.
May I just say what a relief to find someone who genuinely knows what they are discussing online. You certainly realize how to bring a problem to light and make it important. A lot more people really need to check this out and understand this side of your story. I was surprised you are not more popular because you surely possess the gift.
What's uр, І ᴡould ⅼike tto subscribe fоr thiss web site tⲟo take most up-tօ-date updates, thus ԝhｅre
can i do іt рlease help out.
Ⅿy webpage; https://1jokerwin.com.ua/
This is a really good tip especially to those fresh to the blogosphere. Brief but very precise infoÖ Thanks for sharing this one. A must read article!
tadalafil alcohol https://www.pharmaceptica.com/
sildenafil generic in united states https://pharmaceptica.com/
After I initially left a comment I seem to have clicked on the -Notify me when new comments are added- checkbox and now every time a comment is added I receive 4 emails with the same comment. There has to be an easy method you are able to remove me from that service? Many thanks!
hello!,I like your writing so much! proportion we be in contact
more about your post on AOL? I require a specialist on this
house to unravel my problem. Maybe that is you! Taking a look
ahead to look you.
I really love your website.. Very nice colors & theme. Did you develop this amazing site yourself? Please reply back as Iím wanting to create my own blog and would like to learn where you got this from or exactly what the theme is named. Thank you!
PG SLOT สล็อตออนไลน์ SLOT PG
สล็อตออนไลน์ PG SLOT สมัครเล่น เว็บสล็อต ได้เงินจริง เกมส์สล็อตบนมือถือ ยอดนิยมให้เลือกเล่นมากมายไม่ว่าจะเป็น เกมส์สล็อต เกมส์ยิงปลา ไฮโล ไพ่แคง ป็อกเด้ง สมัครเล่นฟรีโบนัส กับสุดยอดเว็บไซต์สล็อตอันดับ1 สนุกสนาน เพลินเพลินกับการเล่นเกมส์ สล็อตออนไลน์ฟรี ทางเข้าเล่น SLOT Online บนมือถือ ดาวน์โหลดฟรี ได้เงินจริง สล็อตเกมส์ที่สร้างเงินให้กับผู้เล่นเป็นจำนวนมาก สมัครสมาชิกโดยไม่มีขั้นต่ำ
พร้อมโบนัสสมาชิกใหม่ สล็อต Slot Free Credit ต้อง weplay168สล็อตออนไลน์
Having read this I believed it was extremely informative. I appreciate you finding the time and energy to put this short article together. I once again find myself personally spending way too much time both reading and leaving comments. But so what, it was still worthwhile!
Semua permainan judi slot online indoensia memang terlalu mengairahkan untuk mampu
dimainkan. di mana sini kita merangkum berbagai situs judi slot online indonesia terbaik terpercaya
yang mampu dimainkan
Aw, this was an incredibly good post. Taking a few minutes and actual effort to make a great articleÖ but what can I sayÖ I hesitate a lot and don't seem to get anything done.
I've learn several excellent stuff here. Certainly price bookmarking for revisiting.
I wonder how a lot effort you put to create any such wonderful informative web site.
Nice post. I learn something totally new and challenging on websites I stumbleupon on a daily basis. It's always exciting to read through articles from other authors and use something from their web sites.
Very good post! We will be linking to this particularly great article on our website. Keep up the great writing.
An intriguing discussion is definitely worth comment. I do think that you ought to write more on this subject matter, it might not be a taboo matter but generally folks don't talk about these topics. To the next! All the best!!
Right here is the right site for anyone who would like to understand this topic. You understand so much its almost hard to argue with you (not that I actually will need toÖHaHa). You definitely put a new spin on a topic that has been discussed for a long time. Excellent stuff, just wonderful!
Hmm is anyone else encountering problems with the pictures on this blog loading?
I'm trying to determine if its a problem on my end
or if it's the blog. Any feed-back would be greatly appreciated.
Way cool! Some extremely valid points! I appreciate you penning this write-up and also the rest of the website is really good.
There's certainly a great deal to find out about this subject. I love all the points you've made.
Next time I read a blog, Hopefully it won't fail me as much as this particular one. I mean, I know it was my choice to read through, but I actually believed you would probably have something interesting to say. All I hear is a bunch of crying about something that you could possibly fix if you weren't too busy looking for attention.
Greetings! Very helpful advice in this particular article! It is the little changes that produce the greatest changes. Thanks for sharing!
An intriguing discussion is worth comment. There's no doubt that that you need to write more on this subject, it might not be a taboo subject but usually people do not talk about such subjects. To the next! All the best!!