LittleJohn wrote in message ogy.net...
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. ;)


Close. The horizontal component in the forward direction is thrust.
in a 90 degree bank the lift is also horizontal.

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FF