Aeronautics Research - WINGGRID - What is it?


Home Research For Teachers HISTORY
Level 1
Level 2
Level 3
Level 1
Level 2
Level 3
Level 1
Level 2
Level 3
Search Hot Links What's New!
Gallery Feedback Admin/Tools

Please let me remind all of you--this material is copyrighted. Though partially funded by NASA, it is still a private site. Therefore, before using our materials in any form, electronic or otherwise, you need to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button. 
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and  (2).

FAQnewred.gif (906 bytes)          

What is it?
angll_ln2.gif (3613 bytes)


The idea

A paradox of nature finds its explanation and application. As shown in the diagram, soaring land birds perform with the same high glide ratio as their cousins of the sea, who feature wings with very high aspect ratios. It has been proposed that soaring land birds use somehow their extended finger- feathers to attain a substantial reduction of induced drag. But how?

This paradox was the starting point to new and successful work, resulting in the WINGGRID.

Diagram: glide ratio of soaring birds.

The African vulture "gyps rupelli" has finger-feathers (aspect ratio of about 8) and a glide ratio of about 20 , which is astonishingly high compared to the albatross with a aspect ratio of 20 and a glide ratio of about 25.

What does it?

How does it do it?

Who do I contact?



Send all comments to
1995-2018 ALLSTAR Network. All rights reserved worldwide.

Funded in part by

Updated: 12 March, 2004