Update, 2:15 PM PDT: Airbus issued this response to the Boeing development:
“This kind of split-tip device was among the options we studied for the A320 Family, and we decided instead to advance with our Sharklet design as the most efficient. Our Sharklet figures (3.5% improvement over the already-efficient A320 wing with wing-tip fences) are flight-test proven.”
Boeing today announced a revised winglet to add 1.5% in fuel efficiency for the 737 MAX, releasing a photo. See here. This will be on top of the advertised 10%12% fuel burn gain previously announced.
Separately, David Hess, CEO of Pratt & Whitney, told the PW media day “that as far as we know, the 737 MAX is not an opportunity for us,” citing the Boeing-CFM exclusivity agreement.
Update, 0900 PDT: Boeing held a tele-press conference to discuss the new “Boeing Advanced Technology Winglets,” (BATW) which it also called “dual feathered” winglets.
Boeing said this is an exclusive Boeing design and not derived from a similar design promoted by Aviation Partners. Key points:
Aviation Partners has a similar concept; the differences between Boeing and AP are evident.
Here’s how McDonnell Douglas executed a similar concept on the MD-11: