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.
After I originally commented I appear to have clicked the -Notify me when new comments are added- checkbox and now whenever a comment is added I get 4 emails with the same comment. Is there a way you can remove me from that service? Many thanks!
After checking out a few of the articles on your site, I truly appreciate your way of writing a blog. I book-marked it to my bookmark site list and will be checking back soon. Take a look at my website too and tell me what you think.
You've made some really good points there. I looked on the web for additional information about the issue and found most people will go along with your views on this web site.
Bactrim https://pharmacylo.com/ medical mall pharmacy
can i take viagra every day https://jokviagra.com/ sublingual viagra
After I initially commented I appear to have clicked on the -Notify me when new comments are added- checkbox and from now on whenever a comment is added I receive four emails with the same comment. Perhaps there is an easy method you are able to remove me from that service? Thanks a lot!
Great web site you've got here.. It’s difficult to find high quality writing like yours nowadays. I honestly appreciate individuals like you! Take care!!
can viagra help ed http://llviagra.com/ viagra e suas reaГ§Гµes
This is the right blog for everyone who would like to understand this topic. You understand so much its almost tough to argue with you (not that I really would want to…HaHa). You definitely put a new spin on a topic which has been discussed for a long time. Wonderful stuff, just wonderful!
generic cialis mastercard https://ucialisdas.com/ – where can i buy cialis online in australia best prices for generic cialis
coupons for cialis https://ucialisdas.com/ – buy cialis online cialis 5mg tablets
Everything is very open with a clear clarification of the issues. It was truly informative. Your website is extremely helpful. Many thanks for sharing!
I'm pretty pleased to uncover this web site. I wanted to thank you for ones time just for this fantastic read!! I definitely savored every part of it and I have you book marked to see new stuff on your web site.
The next time I read a blog, I hope that it does not disappoint me just as much as this particular one. I mean, I know it was my choice to read through, nonetheless I really believed you'd have something interesting to say. All I hear is a bunch of complaining about something that you can fix if you were not too busy searching for attention.
brand cialis https://cialisee.com/ cialis price comparison
You are so interesting! I do not think I have read through a single thing like that before. So good to discover somebody with original thoughts on this topic. Really.. many thanks for starting this up. This web site is one thing that is needed on the web, someone with a little originality!
I blog quite often and I genuinely thank you for your information. Your article has really peaked my interest. I'm going to take a note of your blog and keep checking for new information about once per week. I subscribed to your Feed too.
This is a topic that's near to my heart... Best wishes! Exactly where are your contact details though?
Having read this I thought it was rather enlightening. I appreciate you taking the time and effort to put this article together. I once again find myself personally spending way too much time both reading and posting comments. But so what, it was still worthwhile!
Atorlip-10 http://xlnpharmacy.com/ medicine for erectile
I would like to thank you for the efforts you've put in writing this blog. I am hoping to see the same high-grade blog posts by you later on as well. In fact, your creative writing abilities has encouraged me to get my very own website now 😉
Good post! We are linking to this great post on our website. Keep up the good writing.
You've made some decent points there. I looked on the net for additional information about the issue and found most individuals will go along with your views on this site.
I was able to find good information from your blog articles.
This website definitely has all the information and facts I wanted about this subject and didn’t know who to ask.
I was able to find good info from your blog articles.
Everything is very open with a very clear description of the challenges. It was definitely informative. Your site is extremely helpful. Many thanks for sharing!
20mg cialis online https://rcialisgl.com/ – cialis viagra levitra canada cialis and dapoxetine canada
There's definately a lot to find out about this subject. I like all the points you've made.
Having read this I thought it was rather enlightening. I appreciate you taking the time and energy to put this article together. I once again find myself spending way too much time both reading and commenting. But so what, it was still worth it!
Good day! I could have sworn I’ve been to this website before but after looking at many of the posts I realized it’s new to me. Regardless, I’m certainly pleased I discovered it and I’ll be book-marking it and checking back often!
This is a topic that's close to my heart... Many thanks! Where are your contact details though?
Having read this I believed it was very informative. 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 worth it!
Excellent web site you have here.. It’s hard to find high quality writing like yours these days. I honestly appreciate people like you! Take care!!
buy cialis 36 hour http://cialisee.com/ – cialis generic 20 mg cialis dapoxetine 24 tab
viagra cialis trial pack http://rcialisgl.com/ cialis australia
Hi, I do think this is an excellent blog. I stumbledupon it 😉 I'm going to come back once again since I saved as a favorite it. Money and freedom is the greatest way to change, may you be rich and continue to guide other people.
An interesting discussion is worth comment. I do believe that you need to publish more on this subject, it might not be a taboo subject but usually people do not discuss these subjects. To the next! Best wishes!!
I blog frequently and I truly appreciate your content. Your article has really peaked my interest. I'm going to book mark your blog and keep checking for new details about once per week. I subscribed to your Feed as well.
Your style is so unique in comparison to other folks I've read stuff from. Thank you for posting when you have the opportunity, Guess I'll just bookmark this site.
Greetings! Very useful advice in this particular post! It is the little changes which will make the most important changes. Many thanks for sharing!
Oh my goodness! Impressive article dude! Thank you, However I am going through issues with your RSS. I don’t understand why I can't join it. Is there anybody having identical RSS issues? Anyone who knows the answer can you kindly respond? Thanks!!
erectile dysfunction drug best drugstore eyeshadow FML Forte
I love reading an article that will make men and women think. Also, many thanks for permitting me to comment!
rxpharmacycoupons https://pharmacylo.com/ buy online prescription drugs
Way cool! Some extremely valid points! I appreciate you writing this article plus the rest of the site is also very good.
Greetings! Very useful advice in this particular post! It is the little changes that produce the most significant changes. Thanks for sharing!
May I simply just say what a relief to discover an individual who truly knows what they're discussing on the web. You certainly know how to bring a problem to light and make it important. More people need to look at this and understand this side of the story. It's surprising you aren't more popular because you most certainly possess the gift.
Greetings! Very useful advice within this post! It is the little changes that will make the biggest changes. Thanks for sharing!
You are so awesome! I do not believe I've read anything like this before. So nice to find somebody with a few unique thoughts on this topic. Seriously.. thank you for starting this up. This site is something that is needed on the internet, someone with a bit of originality!
When I initially left a comment I seem to have clicked on the -Notify me when new comments are added- checkbox and now whenever a comment is added I recieve four emails with the same comment. Is there a means you can remove me from that service? Appreciate it!
Spot on with this write-up, I seriously believe this amazing site needs a great deal more attention. I’ll probably be back again to see more, thanks for the information!
After looking into a number of the blog articles on your blog, I honestly like your way of writing a blog. I bookmarked it to my bookmark website list and will be checking back soon. Take a look at my website too and let me know how you feel.
Way cool! Some extremely valid points! I appreciate you writing this write-up and also the rest of the website is very good.
Good post. I am facing a few of these issues as well..
Hi, I do believe this is an excellent web site. I stumbledupon it 😉 I will come back once again since i have bookmarked it. Money and freedom is the best way to change, may you be rich and continue to guide other people.
Way cool! Some very valid points! I appreciate you writing this article and also the rest of the website is also really good.
I could not resist commenting. Exceptionally well written!
Hi! I could have sworn I’ve been to this blog before but after looking at many of the articles I realized it’s new to me. Nonetheless, I’m definitely happy I came across it and I’ll be book-marking it and checking back frequently!