Oz wrote:

On Mon, 02 Feb 2004 11:27:49 +1300, Nav
scribbled thusly:



DSK wrote:


Navvie wrote:



From: http://www.djaerotech.com/dj_askjd/d.../wingfin1.html


This is from a model airplane web site, and some of the terminology for
hydrodynamics is rather different. For one thing, we don't talk about the
"helix angle" of underwater foils. For another, attempting to get a net
forward (or windward) lift component from keel winglets isn't going to work
because they have to sail on both tacks.



Yep, that's why they are on both sides.

Cheers


Which chucks you whole spiel out the window.
Ever see a jet with winglets that extend to the lower side of the
wing?



Never flown inverted on a 747-400 no. Come to that I've never flown on
any inverted jet, but if they were flying both sides up with equal
frequency you can bet there would be winglets on top and bottom... It
really isn't all about the end plate effect you know. Look at AC
winglets -its all about controlling the parasitic drag from the keel tip.

OK?

Cheers