Thanks for those Steve, this article is very through and also talks about the other designs and their limitations, the mono hull one onbeing able to carry one Seahawk sized helo or two VTUAV’s. It says only the Austral design can operate two Seahawk sized helos at one time or one CH-53 or six VTUAV’s (VTUAV’s are Vertical Take-off UAV’s)

It also goes on ton talk about the weapons involved for both Australia and America and how America is focussing on “In close” combat where as Australia doesn’t need the same restrictions and is freer to look at more conventional armourments