As with the chinook if you need both engines to obtain enough hp then it's not the same thing as redundancy.
and that means if you need the payload then you need the power - that leads into your
Otherwise you get the daft situation where 3 flights need to be made in an 'engine failure immune' helicopter against 1 flight in an engine 'exposed' helicopter.
you have to make 3 flights to get the job done in a single when 1 flight in a twin would do it. What about exposure then???
Pie = sky...
Care to elaborate on your 500nm from land in a helicopter? Love to know what has that range.
3000shp? do you need 3000hp? 3000x 10 lbs/hp = 30000lbs that's heavy
the Sea King has 2 1400shp engines for a MAUM of 21400 lbs and they are old technology compared to something like the S92 which I think is 26,500 lbs AUM.
Any one got any Skycrane figures?