Originally Posted by
ShyTorque
As far as "saving the environment" goes, noise reduction has been mentioned more than once. From what I've seen very recently, relatively straightforward innovations in rotor blade design seem to be a very good way forward.
Nothing is straightforward. The fact that these innovations are even happening shows the will to move forward. ETR is one of a number of initiatives as you say.
Real advantages may be gained in new designs where the geometric constraint of a TRDS doesn't apply. However see my previous response on all electric, that step may never come.