I may be stepping out of my area of knowledge but to add to what Zissou said, can the 53's carry as much as the 47's at that altitutide.
The 47's do have manual folding blades for sustained shipboard operations http://www.specwarnet.net/vehicles/mh-47.htm
If I remember correctly most of task force sword in Afghanistan was based off of ships
The 47's do have manual folding blades for sustained shipboard operations http://www.specwarnet.net/vehicles/mh-47.htm
If I remember correctly most of task force sword in Afghanistan was based off of ships