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Thanks to Tim M. for starting this interesting topic here viewtopic.php?f=2&t=3227&start=0

I found my saved magazine articles and engineering PDF's on my old computer and will post the links here

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Wing in Ground Effect Craft Review

The Sir Lawrence Wackett Centre for Aerospace Design Technology Royal Melbourne Institute of Technology Contract Report CR-9802

Aeronautical and Maritime Research Laboratory

87 pages PDF http://www.abbottaerospace.com/download ... Review.pdf

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1994
Design of a wing section in ground effect : application to high speed ground transportation
Christoph Hiemcke
Iowa State University

369 pages PDF http://lib.dr.iastate.edu/cgi/viewconte ... ontext=rtd

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1989 Popular Mechanics article

https://books.google.ca/books?id=FeYDAA ... sh&f=false

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Excellent website

Dr. Alexander Martin Lippisch

The Grandfather of WIG

https://sites.google.com/site/hoverwing ... d-articles

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Very good Airfish-8 article from 2010

Wordpress

https://thelongnwindingroad.wordpress.c ... airfish-8/

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Thanks Arnie ..... those are very interesting articles!

...so glad you are one of us original ...and still a busy contributer to the pool of interesting flying stuff here!

Boy.....that had to take some time to find and compile all that information.....thank you Arnie!

Very impressive, Arnie !!

Chris and I would like to invite you to our place if ISIS takes over Canadia !!

(and don't bring more than 8000# of free DOPE !)

fj.

Absolutely fantastic compilation. Thank you so much Arnie

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This video shows un-powered models skimming a smooth floor and remain stable ... great proof of concept

Much the same as when a piece of paper falls off a desk it will float 1/16" above the floor to the other side of the room.

The engineer then describes how the center of pressure keeps moving forward as the wing gets farther from the surface

This requires a lifting surface (tail) to keep the nose down but also introduces a slight see-saw instability which can be managed nicely with elevator controls

But oceans have waves so it must fly farther out of ground effect which moves the C.of.P forward , until it is counteracted by the tail , which brings it back closer to the surface , which causes the C.of.P to move backward and a self induced see-saw effect begins.

The combination of machine-induced-oscillation , and pilot-induced-oscillation is the difficulty engineers have to overcome.

If the water was glass smooth it would fly perfectly stable even without elevator controls as the video shows.


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