Thread Tools Display Modes
Old 05-19-2013, 06:22 PM   #41
Codger2's Avatar
City: San Diego
Country: US
Vessel Name: "Sandpiper"
Vessel Model: 2006 42' Ocean Alexander Sedan
Join Date: Oct 2007
Posts: 5,468
Originally Posted by FlyWright View Post

COOL! But are these "Ground Effect Vehicles" or derivations of these?
Attached Thumbnails
Click image for larger version

Name:	Air cushion boat.jpg
Views:	42
Size:	110.2 KB
ID:	19430  


My passion for improving my boat(s) exceeds my desire to constantly cruise them.
Codger2 is offline   Reply With Quote
Old 05-19-2013, 06:35 PM   #42
Scraping Paint
City: -
Country: -
Join Date: Oct 2007
Posts: 13,748
No. Hovercraft use a cushion of air trapped under the vehicle and allowed to bleed out under the skirts to hold the vessel off the water and reduce the friction against the water's surface so they can be moved fairly effieciently.

The Ground Effect Vehicles are indeed flying and generating lift aerodynamically by the movement of their wings through the air. But by flying just a few feet off the water the greatly reduced drag from ground effect enables them to fly with far less energy expended than if the same machine were to fly at altitude.

So they can fly fairly fast--- some 300 miles an hour in the case of the Soviet machines-- and carry a good size load. The power that would otherwise be needed to provide a lot of lift at altitude can instead be used to provide less lift but carry a heavier load in ground effect.

If you talk to one of your local cormorants or pelicans he or she will be able to give you a much better explanation of ground effect and its benefits than I can. In the photo below I am getting a detailed explanation and demonstration of ground effect from the cormorant I went fishing with on the Li River in China the other year.

When my videographer took this shot the cormorant was getting quite frustrated with my inability to grasp nuances of the air's movement around his wings in ground effect and how he could alter it almost infinitely by moving his trailing edge and wingtip feathers. So he was in the middle of giving me a graphic demonstration of his feather-activation system when Tom took the shot.
Attached Thumbnails
Click image for larger version

Name:	Cormorant 3.jpg
Views:	53
Size:	101.2 KB
ID:	19431  

Marin is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 01:50 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012