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.
I would like to thank you for the efforts you have put in penning this site. I am hoping to see the same high-grade blog posts by you in the future as well. In fact, your creative writing abilities has inspired me to get my very own blog now 😉
Your style is so unique compared to other folks I have read stuff from. Many thanks for posting when you have the opportunity, Guess I will just bookmark this blog.
After exploring a number of the blog articles on your website, I really like your way of writing a blog. I book-marked it to my bookmark website list and will be checking back soon. Take a look at my web site as well and tell me what you think.
Hi, There's no doubt that your site could possibly be having browser compatibility problems. Whenever I take a look at your blog in Safari, it looks fine however, if opening in Internet Explorer, it has some overlapping issues. I just wanted to provide you with a quick heads up! Aside from that, wonderful site!
You should be a part of a contest for one of the best sites on the net. I am going to highly recommend this web site!
You ought to take part in a contest for one of the best websites on the internet. I'm going to recommend this website!
Excellent site you've got here.. It’s hard to find quality writing like yours nowadays. I honestly appreciate individuals like you! Take care!!
I was pretty pleased to uncover this web site. I wanted to thank you for your time for this particularly fantastic read!! I definitely enjoyed every little bit of it and I have you book marked to check out new information on your blog.
Everything is very open with a really clear clarification of the challenges. It was truly informative. Your website is very useful. Many thanks for sharing!
It’s hard to come by knowledgeable people for this topic, however, you sound like you know what you’re talking about! Thanks
Good day! I could have sworn I’ve been to this blog before but after browsing through some of the posts I realized it’s new to me. Anyways, I’m definitely delighted I discovered it and I’ll be bookmarking it and checking back regularly!
Naltrexone online pharmacy no prescription needed rx care pharmacy zephyrhills fl
This page really has all of the info I needed about this subject and didn’t know who to ask.
cialis cost 20mg https://cialishav.com/ – buy cialis tadalafil cialis for ed dosage
cheap rx mexican pharmacy drugs legal in canada but not us
Everyone loves it whenever people come together and share ideas. Great site, keep it up!
You are so interesting! I do not believe I have read anything like this before. So nice to find someone with a few genuine thoughts on this subject. Seriously.. thanks for starting this up. This site is something that's needed on the internet, someone with a bit of originality!
Howdy! I just would like to offer you a big thumbs up for the great info you have got here on this post. I'll be returning to your site for more soon.
Spot on with this write-up, I really think this amazing site needs a lot more attention. Iíll probably be returning to see more, thanks for the information!
Greetings! Very helpful advice in this particular post! It's the little changes that will make the most significant changes. Thanks for sharing!
Spot on with this write-up, I honestly believe this site needs a great deal more attention. I’ll probably be back again to read more, thanks for the information!
I was pretty pleased to find this website. I wanted to thank you for ones time for this particularly wonderful read!! I definitely enjoyed every part of it and i also have you saved to fav to check out new things in your web site.
cost of cialis https://tadalafilol.com/ – tadalafil side effects cialis without a prescription buy cialis https://apcalisetadalafil.com/
tadalafil goodrx https://apcalisetadalafil.com/ – buy cialis pills tadalafil cost walmart cialis cost https://apcalisetadalafil.com/
After checking out a number of the articles on your website, I seriously like your way of writing a blog. I book-marked it to my bookmark site list and will be checking back in the near future. Take a look at my website too and let me know how you feel.
I truly love your blog.. Pleasant colors & theme. Did you develop this website yourself? Please reply back as I’m wanting to create my own blog and want to learn where you got this from or exactly what the theme is called. Thanks!
After going over a handful of the articles on your web site, I truly like your way of writing a blog. I saved as a favorite it to my bookmark website list and will be checking back in the near future. Please check out my website as well and let me know how you feel.
Hi, I do think this is an excellent blog. I stumbledupon it 😉 I am going to come back once again since i have saved as a favorite it. Money and freedom is the best way to change, may you be rich and continue to guide others.
Saved as a favorite, I love your web site!
Hi, I do believe this is a great blog. I stumbledupon it 😉 I am going to return yet again since I book-marked it. Money and freedom is the best way to change, may you be rich and continue to guide others.
Very good article. I'm facing a few of these issues as well..
You're so cool! I do not suppose I've read through a single thing like that before. So good to find another person with some genuine thoughts on this subject matter. Really.. many thanks for starting this up. This web site is something that is required on the web, someone with a bit of originality!
Having read this I thought it was rather enlightening. I appreciate you spending some time and energy to put this short article together. I once again find myself spending a significant amount of time both reading and posting comments. But so what, it was still worth it!
I’m amazed, I have to admit. Rarely do I encounter a blog that’s equally educative and amusing, and without a doubt, you've hit the nail on the head. The problem is an issue that too few folks are speaking intelligently about. I'm very happy I stumbled across this in my search for something concerning this.
Excellent post. I will be dealing with some of these issues as well..
You ought to be a part of a contest for one of the best blogs on the net. I most certainly will recommend this site!
avanafil 200 avanafil stendra
I couldn’t refrain from commenting. Exceptionally well written!
best price usa tadalafil tadalafil goodrx prescription tadalafil online https://apcalisetadalafil.com/
best price usa tadalafil buy generic cialis online with mastercard buy cialis pills lowest price cialis https://tadagatadalafil.com/
Aw, this was an exceptionally good post. Spending some time and actual effort to produce a great article… but what can I say… I procrastinate a lot and never seem to get anything done.
Good article. I'm experiencing some of these issues as well..
An outstanding share! I have just forwarded this onto a colleague who has been conducting a little homework on this. And he in fact bought me breakfast because I found it for him... lol. So allow me to reword this.... Thanks for the meal!! But yeah, thanks for spending some time to discuss this issue here on your site.
cialis 800mg https://cialisjla.com/ – cialis with dapoxetine cialis oral
Oh my goodness! Impressive article dude! Thank you so much, However I am going through troubles with your RSS. I don’t know why I am unable to join it. Is there anybody getting the same RSS issues? Anyone who knows the answer can you kindly respond? Thanx!!
buy cialis https://ckacialis.com/ – walmart cialis levitra or cialis which is better
Hello, I do think your web site could be having web browser compatibility problems. When I look at your blog in Safari, it looks fine however, if opening in I.E., it has some overlapping issues. I merely wanted to provide you with a quick heads up! Besides that, wonderful site!
online pharmacy legit https://pharmacyken.com/ – pharmacy cheap no prescription disposing of prescription drugs
I really love your website.. Pleasant colors & theme. Did you build this site yourself? Please reply back as I’m looking to create my own blog and would love to find out where you got this from or what the theme is named. Thank you!
A fascinating discussion is definitely worth comment. I do believe that you ought to publish more on this topic, it may not be a taboo subject but usually folks don't discuss these subjects. To the next! Kind regards!!
I'd like to thank you for the efforts you have put in penning this website. I am hoping to view the same high-grade content by you in the future as well. In truth, your creative writing abilities has encouraged me to get my own blog now 😉
May I simply just say what a relief to discover a person that genuinely knows what they are talking about online. You definitely realize how to bring a problem to light and make it important. More and more people have to check this out and understand this side of the story. I was surprised you're not more popular because you certainly possess the gift.
That is a really good tip particularly to those new to the blogosphere. Brief but very precise info… Appreciate your sharing this one. A must read post!
https://apcalisetadalafil.com/ tadalafil cost in canada https://tadagatadalafil.com/ – cialis tadalafil buy cialis pills
Hi there! I could have sworn Iíve visited this website before but after browsing through some of the posts I realized itís new to me. Anyways, Iím certainly happy I discovered it and Iíll be book-marking it and checking back often!
Spot on with this write-up, I really believe this site needs a great deal more attention. I’ll probably be returning to read more, thanks for the info!
This is a topic that is near to my heart... Many thanks! Where are your contact details though?
I truly love your site.. Great colors & theme. Did you make this web site yourself? Please reply back as Iím looking to create my very own website and would like to find out where you got this from or just what the theme is named. Many thanks!