[PSUBS-MAILIST] underwater gliders

[William Alford <walford@dbtech.net>]

http://abcnews.go.com/sections/scitech/CuttingEdge/cuttingedge021011.html

As the vessel dives, a small motor pushed the bank of batteries slightly
forward, shifting it into a nose down attitude. The water that rushes over
the "wings" of the glider pushes the craft forward as it falls through the
water. 
Once it reaches a pre-determined depth, the process is reversed and the
Seaglider begins to rise. As it goes up, the wings continue to give the
Seaglider forward momentum, pushing it further along through the water.

William Alford
walford@dbtech.net

Tout comprendre c'est tout pardonner