It does look cool, but I'd be interested to see if there has been a demo of this bit:
The aircraft's engines could use both fuel to burn in the engine's core, and electricity to turn the turbofan when the core is powered down
That sounds
really hard to do on a plane sort of weight. Plus, I'm kind of curious as to the cost \ benefit (and, again, weight \ benefit) of solar panels on a commercial aircraft.
Regards,
Ad
That is actually the only part of this design that doesn't suck so hard I could use it to make a near-perfect vacuum. The fact is you only need full power for a small part of the entire flight, and this does save fuel. It's not likely to show up until the N+2 aircraft (the aircraft that are two generations removed from the current generation - That is the 737NGs), but it is likely to show up. It actually avoids the electric storage issues by having some (likely all for redundancy) of the engines have a generator, and some (again, likely all) have the electric motors. The other option is to use energy storage in the form of batteries/capacitors or fuel cells. This has major weight issues.