HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Greg M. Jung
User Rank
Platinum
Innovative Idea
Greg M. Jung   10/24/2012 7:45:22 AM
Great idea that can be implemented by the Air Force quickly.  (However, let's not do this for our passenger jets...)

Beth Stackpole
User Rank
Blogger
Re: Innovative Idea
Beth Stackpole   10/24/2012 9:26:47 AM
NO RATINGS
Agreed, Greg. Given some of the issues with air traffic control and the ungodly backlog of planes at US hub destinations, we don't need to throw vortexing into the mix to complicate aircraft safety.

Rob Spiegel
User Rank
Blogger
Re: Innovative Idea
Rob Spiegel   10/24/2012 11:43:58 AM
NO RATINGS
This is a great idea. Yet another advance borrowed from dynamics in nature. Geese get even more out of the system by rotating which goose has the more difficult drag and placing the weakest goose in the high glide position.

JimT@Future-Product-Innovations
User Rank
Blogger
Turbulence vs. Reduced Drag
JimT@Future-Product-Innovations   10/24/2012 12:41:23 PM
NO RATINGS
I'm not a pilot but my Dad was; and I specifically remember him talking about dangers of flying into the turbulence of a vortex from a larger plane, particularly on the runways during T-O & L .  Maybe using like-sized planes (2 C17's in this example) reduces or eliminates that danger, but I know just from freeway driving that 18-wheeler vortex's cause unseen forces on your stability.  On the contrary, the NASCAR crowd often quips, "I ain't tail-gatin' – I'm DRAFTING!" -- so it's a well-known trick – now applied to the skies.

Beth Stackpole
User Rank
Blogger
Re: Turbulence vs. Reduced Drag
Beth Stackpole   10/24/2012 2:19:36 PM
NO RATINGS
Definitely a well-known trick in the world of racing and bike racing. We did a post on a CFD study conduced by Eindhoven University of Technology in The Netherlands, to analyze the drafting effects of cyclists in more detail. Specifically, they were examining the air resistance on the leading rider.

 

Charles Murray
User Rank
Blogger
Re: Turbulence vs. Reduced Drag
Charles Murray   10/24/2012 6:24:14 PM
NO RATINGS
I'm not a pilot, either, JimT, but since you have a connection to the aviation world, I have a question for you: Could the phenomenon being described here also be known as "wake turbulence?" Isn't that considered dangerous?

TJ McDermott
User Rank
Blogger
Re: Turbulence vs. Reduced Drag
TJ McDermott   10/25/2012 11:06:09 AM
NO RATINGS
Drafting is a little different than vortex surfing, I think.  The paragraph immediately after the image describes it best.  Riding the vortex increases lift (think higher pressure on the lower surface of the wing).

Drafting vehicles try to avoid the vortices.

And yes, vortices from larger aircraft can be incredibly dangerous for smaller craft.  Some aircraft more than others - I've read that a Boeing 757's vortices are notable and it's worth it for small aircraft to wait more than 2 minutes before taking off after a 757.

JimT@Future-Product-Innovations
User Rank
Blogger
Re: Turbulence vs. Reduced Drag
JimT@Future-Product-Innovations   10/25/2012 4:50:46 PM
NO RATINGS
Yes, that's exactly the scenario I'm thinking of.  And yes, my Dad used to say exactly that - at least two minutes pause on the tarmac prior to positioning for the take-off.

kenish
User Rank
Platinum
Re: Turbulence vs. Reduced Drag
kenish   10/26/2012 1:55:46 PM
NO RATINGS
I'm a private pilot...planes are separated for wake turbulence.  "Heavy" aircraft >300k pounds are given extra separation.  If you listen to ATC radio chatter you might hear a flight call in as "United 15 Heavy".  After a wake turbulence accident in Orange County involving a business jet,  NASA testing discovered 757's have a very strong wake due to the high lift wing and full span flaps.  (Requirement for the 757 was transcon range out of La Guardia and Orange County...both have very short runways)  BTW, the 757 has the highest thrust/weight ratio of any airliner except Concorde.  A full-thrust takeoff in a 757 from SNA followed by the noise abatement power cut at 1000 feet is always exciting :)

Elizabeth M
User Rank
Blogger
Great feedback
Elizabeth M   11/5/2012 12:32:23 PM
NO RATINGS
It's really interesting to hear especially from the pilots about this concept. I, too, wondered about the dangers of wake turbulence, having seen some television shows and read articles about it. I imagine it's a tricky balance to maintain the right distance and formation to leverage the vortex without putting either craft in danger, as TJ pointed out. I'm not a pilot or an engineer, but I imagine, too, using aircrafts of similar weight makes this safe as well.



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