HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 3/3
notarboca
User Rank
Gold
Re: Acceleration?
notarboca   8/14/2012 10:53:14 PM
NO RATINGS
@Jon Titus--I, too, have questions about acceleration.  Would this require pressure suits for passengers, or perhaps some sort of encapsulated seat that would react to the G-forces?

Jon Titus
User Rank
Blogger
Acceleration?
Jon Titus   8/14/2012 6:42:57 PM
NO RATINGS
Perhaps the rapid acceleration would kill the passengers and crew. Not a good way to start a new airline.

NadineJ
User Rank
Platinum
different world today
NadineJ   8/14/2012 5:44:09 PM
NO RATINGS
From my understanding, faster speed = high fuel consumption.  During the days of the Concorde, high fuel consumption wasn't seen as a problem.  Today, consumers and the market are more focused on things that, at least, appear to be good for the environment.

Rob Spiegel
User Rank
Blogger
Re: West to East in less than an hour
Rob Spiegel   8/14/2012 5:23:12 PM
NO RATINGS
Yes, it's the sonic boom that limits air speed over land:

http://www.discovery.com/area/skinnyon/skinnyon.html

Exceeding 660 miles per hour above sea level creates the boom. Once an aircraft breaks the sound barrier, it creats an extended boom that is heard by anyone who is near the supersonic craft. So it isn't just one single boom -- it's continuous as long as the craft is exceeding the the sound barrier, even if those on the ground experience it as a single boom. So, on a flight from L.A. to N.Y that exceeds the sound barrier, everyone on the ground between the two cities would experience the window-shaking (and sometimes window-breaking) boom.

NASA, however, is looking at strategies for taking the boom out of high speed aircraft:

http://www.nasa.gov/connect/chat/sonic_boom_chat.html

Rob Spiegel
User Rank
Blogger
Re: West to East in less than an hour
Rob Spiegel   8/14/2012 4:59:49 PM
NO RATINGS
OK, that explains a lot. When I read the article -- which didn't address sonic booms -- I wondered whether the small size of the craft negated the sonic booms. Maybe they just take the boom over the ocean and move on.

richnass
User Rank
Blogger
Re: West to East in less than an hour
richnass   8/14/2012 4:56:38 PM
NO RATINGS
I believe you are correct about the sonic booms. They had to be over the ocean before going to hyperspeed. The test run by the Pentagon today was also over the ocean.

Rob Spiegel
User Rank
Blogger
West to East in less than an hour
Rob Spiegel   8/14/2012 4:51:22 PM
NO RATINGS
Yes, Rich, I also saw that CNN article, andI too was surprised. I was under the (perhaps mistaken) impression that speeds exceeding 600 mph would cause sonic booms that would be unacceptable to residents. And thus, there was a wall against faster speeds. Yet at 4,500 mph, why no sonic booms?

Jack Rupert, PE
User Rank
Platinum
Who's to Blame?
Jack Rupert, PE   8/14/2012 4:45:28 PM
NO RATINGS
What's getting in the way of speed?  Is it just cost or is it, like usual, government regulation?  Even in its heyday, the Concorde was only allowed to fly at its advertised speed over open ocean.  I think it was "illegal" for them to fly a New York to LA route at those speeds.

<<  <  Page 3/3


Partner Zone
Latest Analysis
In this new Design News feature, "How it Works," we’re starting off by examining the inner workings of the electronic cigarette. While e-cigarettes seemed like a gimmick just two or three years ago, they’re catching fire -- so to speak. Sales topped $1 billion last year and are set to hit $10 billion by 2017. Cigarette companies are fighting back by buying up e-cigarette manufacturers.
Microchip recently released the 3D TouchPad, the first USB PC Peripheral device that couples 2D multi-touch input with 3D air gesture technology. The company seeks the help of developers to further enhance the capabilities of the technology.
Made by Monkeys highlights products that somehow slipped by the QC cops.
To give engineers a better idea of the range of resins and polymers available as alternatives to other materials, this Technology Roundup presents several articles on engineering plastics that can do the job.
Mac Cameron of Stratasys describes the company’s Connex3 technology, which allows users to 3D-print complex parts in one build with no assembly required.
More:Blogs|News
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service