HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
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.

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 :)

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.

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.

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?

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.

 

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.

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.

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.

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...)



Partner Zone
Latest Analysis
A study by the Swiss government determined the type of human errors that lead to engineering disasters and ranked those errors by percentage.
General Motorsí growing commitment to electric cars took a new turn last week, as the giant automaker said it would use EV batteries in the future to help boost its use of renewable energy.
A fabric designer and chemical engineer have teamed up to design fabric woven with solar panels for the future of wearable, autonomously powered technology.
A new linear encoder will offer measurement resolution of about 31 picometers -- less than the diameter of an atom -- when it hits the market in prototype form later this year.
Apple made some controversial decisions with its new iPhone 7 models, so what did they do with the extra space? The latest teardown from iFixit digs under the hood of Apple's new sensor-heavy phone.
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.
Sep 12 - 16, Analytics for the IoT: A Deep Dive into Algorithms
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 Stratasys
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