Comment Re:Smartphone power (Score 2) 62
Not quite true. Current 747 have a higher cruise speed and reduced fuel usage compared to the 1969 model. It isn't breathe taking difference but it does exist. Basically all new business jets run at mach
Like batteries we are at limits of chemical energy storage. Even hyper velocities are tough to maintain at a practical level. Improvements are only coming slowly. Without a major energy breakthrough we are going to be hitting some major roadblocks in the future.