DcL - I'll take your word for the advancement of the technology - I'm just a guy who flys helicopters for a living not a boffin. but given these constraints how close are we really to seeing ETR in production?
Caveat that this is my personal WAG. If there is a will, I reckon 18 months to free flight. Realistically 3 years to an available production item. 5 years to realise the advantages?
The thing I see is that technology is advancing so fast that the move to hybrid and all electric may mean it's not worth the short term investments for just an ETR. Hence my comments about the next 10 years.
As I say, my opinion only .