>>1094846So far in the quest for efficiency, the latest thing is geared turbofans, which enable greater thrust without the turbine blades going supersonic at the outside edges (they're designed to be able to do that, but it is noisy and inefficient).
The next step will be electrically geared turbofans.
After that one interesting possibility is split electrically geared turbofans
(two engines producing thrust and electricity + two additional ducted fans consuming electricity to produce thrust).
