Perhaps you are tackling the problem the wrong way. Was the Armidale debacle a design issue, vessel size, crewing, over worked, maintenance or materiel issue. As usual it's always multiple reasons but with what weight on each. CN has said this year that after allocating more time to the maintenance to the vessels that the availability has gone back up to where it should be. But what caused the maintenance issue? Poor contractors, poor design, poor materials or driving the boat over spec?
Just asking for bigger ships might not actually solve anything. As I've said before when we took an ANZAC to Heard Island, we halved its shelf life. Was that a design issue?
Perhaps one should take a look at what the ACPB's are being required to do, and then go from there? Or possibly take a look at what the actual FCPB replacement programme had been back in the 90's.
If one looks at a number of the SIEV's over the last decade or so, several (many?) have been unseaworthy and had to have passengers/crew evacuated to Australian assets. AFAIK this has not caused Australian casualties or a loss of vessel, yet...
Even with the
Cape-class Customs Vessels being able to handle ~60 SIEV passengers, that means SFA if the SIEV has 3x that number. While an argument could potentially be made that having a smaller capacity but more vessels to cover a single SIEV that IMO is insufficient. In order for greater numbers of smaller capacity vessels to fufill the need, the numbers of vessels on hand needs to be sufficient. If a SIEV is stopped and the people need to be taken off, having additional patrol boats within a day or two transit time will not keep the responding vessel from becoming overloaded.
That suggests some forward thinking so that patrol vessels which might be engaged in SAR ops, as well as intercepting SIEV's, at least have a surge capacity to take on
nn additional passengers
safely. Also, given the still significant size of the Australia EEZ requiring patrolling, allowing sufficient space to include as much effective methods of conducting volume searches would be sensible. In this case, the ability to operate some sort of naval helicopter and/or UAS with E/O and sea search radar systems.
There is also the matter of what sea states that some patrol assets must be able to operate in. IIRC the contract for the ACPB required sea state 5, yet operational experience has indicated that sometimes RAN patrol assets have to operate in sea state 7... That suggests that at least some RAN assets should be able to operate in sea state 7.
Now we have already seen Gov't interfere with RAN patrol boat replacement planning by cancelling the OPV, forcing the extension of the FCPB and then a hurried replacement since they were shagged. Time will tell if Gov't causes similar problems with the replacement for the
Armidale-class, but it seems likely.
-Cheers