Whilst I'm sure we are all keen to see which design is selected and obviously the number of boats, will it be 8 and 4 options, 9 and 3 options, etc, or a commitment to the full 12? Who knows!
The one thing that I'm very interested in knowing is the planned production schedule for the boats, commissioning dates, and especially the 'drumbeat', eg, the gap planned between each commissioning, will it be 12mths, 18mths or even 24mths??
Assuming the Soryu class is selected, it's interesting to look at the Japanese production schedules for their boats.
https://en.wikipedia.org/wiki/Sōryū-class_submarine
Currently Japan commissions one new boat pretty well on schedule 12mths apart, but of course with two yards building, MHI and KHI, each yard is producing a boat every 24mths.
Looking at the info available on the Soryu boats, it appears that on average, it is four (4) years between laying down to commissioning, and you would probably add another two years prior to laying down for the first cutting of steel, would it be reasonable to assume that the time from steel cutting to commissioning is approx. six (6) years??
(As a side note the USN Block I Virginia boats took 7 years to construct and by the time of the Block II boats that was cut by 15mths, so a bit under 6 years construction time).
Assuming it is going to be 6 years from cutting steel to commissioning of the first Collins replacement (working backwards), if the first boat was to commission in 2026, then 2020 would appear to be when the first steel has to be cut, is that possible?
Is it more likely that the first boat would commission in, say, 2028 and therefore steel cutting would commence in 2022?
(Techport is going to be a pretty busy place, from what the Government said last year, the plan is for cutting of steel for the OPV's to commence in 2018 and for the Future Frigates in 2020, I'd imagine that block work for those two projects would also be spread around the country too).
Obviously at this stage the planned commissioning date of the first boat isn't overly clear, from what I have read in the past, Collins is due to decommission in 2025, will we see a capability gap? Or will the life of Collins and her sisters be extended?
The other thing that I'm particularly interested in is the 'drumbeat', the planned gap between the commissioning of each boat, as I mentioned above, Japan has two yards producing the Soryu class, each yard is currently operating to a drumbeat of 24 months between the boats produced out of those individual yards.
If the same production tempo was followed here, then it's going to take 10 years for the commissioning of the first 6 boats, if it's 8 boats, then its 14 years, 10 boats, 18 years and so on.
If the drumbeat was reduced to an 18mth gap for example, then 6 boats would take 7.5 years, 8 boats 10.5 years and so on.
If it was 24mths, well that sort of stuffs things up as far as timely replacement for the Collins boats (18mths would be more appropriate in that regard), but on the other hand 12 boats with a 24mth gap almost gets you to a 'continuous' build process timeframe, and especially if boats are built in evolving 'batches', with a bit of gap in between each batch too.
Anyway, it will be interesting to see what the drumbeat will be, and what can be achieved and how that is all going to tie in with the planned decommissioning dates of the Collins boats.