I think the diesel heli idea has a lot going for it.
As well as fuel commonality mentioned earlier a decent range might be possible.
Being more efficient there's less waste heat to lose, and presumably less useless time needed for warm up and cool down.
Possibly more tolerant of abuse, and surely a longer TBO just like road engines.
For me the greatest bonus is losing the magnetos and carby ice.
Brilliant, hope they do it
