Uzlu said:
Will it have a very large growth margin similar to the Arleigh Burke-class destroyers? There was a huge increase in displacement from Flight I to Flight III.
Sort of. The different Flights I and II are the same hull. Flight IIA and Flight III of the Burkes are different. They get physically larger (in length) as you go down the line. The first 28 Burke's didn't have hangars etc... which was corrected on Flight IIA. But Flight IIA are a meter longer. The Flight III, I understand have reached the maximum design margin for that particular ship design.
Actually now that I think about it the Arleigh Burke is a good comparison ship for the Type 26 design margins. The Burke is 154m long and has a 20m beam. Type 26 is 150m long and 20.8m beam.
What I meant by that comment is that there is a maximum tonnage that a ship can have. If the Aussies have an 8800 ton ship and we want a 7800-ton ship then there are at least 1000 tons we can grow into, with a growth margin of about 13% on the same hull. A Burke Flight II is about 8400 tons so the numbers are comparable (yes the Burke is 5m longer but that extra 0.8 beam on the Type 26 is has more influence then its meagre number might indicate).
But tons are not as important as they used to be. I had an excellent conversation before all the social distancing hit with my offices Nav Arch. He explained to me how things have changed over the years on important numbers for ships.
At first, it was number of guns you could mount. Basically the weight of shot. That was the critical design feature of warships. More guns equaled better warships.
As time went on it changed to tonnage. How big you could make the ship allows you to pile on armour, big guns, and powerplant to move it. More tons equaled better warship.
Now its about topside space. How many sensors, comms and EW can you cram on the ship that don't interfere with each other. Every system is fighting each other for the prime real estate on the mast. Do you have the space to place all the missiles, land a helo, launch boats? More space equals better warship. This is one of the reasons that current warship design has gone with internal walkways instead of the old school railings and open upper deck (stealth is the other reason).
It's all related of course... more space is directly related to dimensions, but tons are not all created equal. More tons up high need to be calculated for to ensure stability (ie: a 4 ton wieght 4 decks above the waterline could equate to approx 60 tons of lead ballast, which is wasted design margin).