Cow Horn Winglets on an A320
Just spotted a photo of the first above aircraft with cow horn winglets as opposed to triangular shaped end of wing extensions unique to Airbus. Are these existing triangular winglets there for the same purpose as the usual Boeing style, are they as effective, from the A320 above I must assume that they are not? Finally from previous threads I have read that winglets offer a 5+% saving but in real terms how long might it take to get the initial outlay back.