Yeah, we're definitely in fantasy land now
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Back in the real world; is the government really going to approve the huge cost of a vessel like the Endurance 170? Something they will see as an aircraft carrier? And it's not just the cost of the vessel itself, to justify that level of capability we would need more equipment to fill it. With NZ's current helicopter fleet we'd struggle to fill the deck landing spots, let alone the hangar space.
I've never seen a requirement for NZ's future sea lift ship to be able to host an Osprey, but I have seen the requirement that it have a relatively shallow draught to allow access to the small islands in the South Pacific.
The Canterbury has a draught of 5.4m, the Endurance 160 has a draught of 5.8m and the Makassar class has a draught of 4.9m.
The biggest reason for suggesting a Makassar class variant is cost. Peru paid US$60m for their first ship in 2013 and Indonesia paid even less for their vessels.