Dit :
My opinion is that Boeing and Airbus have no need to rush into this, they have the two best selling single aisle aircraftin the industry, let someone else test the technology, then work out their mistakes and produce an airaft that inproves on it. Thus their estimate of 2020ish.
I think news about configurations for 737/A30X is kept closely secret by Airbus and Boeing. Some details are published:
Airbus is exploring novel aircraft configurations in a wind-tunnel facility, says a company official. Because the A30X concepts differ markedly from traditional Airbus designs, extensive evaluations have to be performed, he adds.
Link to Aviation week article: Airbus Refines A30X Design | AVIATION WEEK
While open-rotor airliner configurations have been studied for many years, there are questions about likely airworthiness rules in areas such as engine layout and blade containment.
Link to flightglobal article: Airbus links with engine makers to seek clarity from authorities on open rotor airworthiness require
