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
DIY candy, journeys to Mars, coding for road trips, and more. These STEM (science, technology, engineering, and math) activity options will keep kids engaged this summer, from 10-minute activities to more advanced undertakings.
Nothing is more frustrating than developing a plan and then, in the heat of the battle, having to diverge from the plan when chaos happens.
In June, teams from across the US, and several countries worldwide, competed for awards in multiple categories at the 2016 Formula SAE Lincoln competition.
A 45-minute per day free course will take place July 11-15, and will walk engineers through a hands-on approach to debugging real-time embedded software.
Forget doping. Officials at this yearís Tour de France are looking for a very different form of cheating -- electric motors hidden inside the seat tubes of bicycles.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


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 Course June 28-30:
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service