On Fri, 28 Nov 2003 21:36:17 +0000, cddb wrote:

Don't think so.
Gravity provides the thrust. Quite noticeably when fuselage
is pointed vertically. None at all when fuselage/wing is horizontal.

Look at it from another point of view. If all forces are balanced and
winglets are added, drag is reduced. Then velocity increases until the
thrust/drag forces are equalized. The result of increased velocity is
additional lift. The horizontal component of the lift vector is thrust,
which increases as lift increases. Ergo, winglets produce thrust. ;)

LittleJohn
Madison, AL