Keith.Williams,
And I suppose just cause I read it on the internet I should assume it is true?
Romeo Tango Alpha,
We will see blended winglets on 777s within a few years. Already in the works. They won't be that big though.
When it comes down to the winglets producing thrust, they may vector something in a direction that makes it look like thrust, but without the help(WORK) of something else the only pushing they do on the airframe is side to side when the wind is blowing real hard at the gate.
