You are correct, the level of “defence” needs to appropriate to the role - which is primarily to protect itself and stand off protection of its drones that would mostly (putting aside UUVs etc) be operating in line of sight against threats like small craft as well as helicopters/UAVs.Lord Jim wrote:When we talk about the "Strong Self Defence Capability" that is desirable for our possible future MCVs, I think aiming to install almost the same amount as is carried by the T-31 is a rabbit hole we do not what to go down. Even if the vessels are also to have a "Patrol" function, I do not see the need for anything beyond say a BAe 40mm Mk4 Bofors, possibly with 3P ammunition as its main weapon. This would be more than enough to prevent the vessels being harassed by unfriendly Speed Boats and have a limited AAW capability. If a greater anti-surface capability is needed then maybe having a five round launcher of the LMM attached to the Mk4. For the vessels to operate in more hostile waters then an escort will have to be provided bringing with it greater AAW and ASuW capabilities
However, no one is talking about large ASMs nor wide area AAW protection. Comparisons to the T31 may be a rabbit hole, but my view is the T31 is a rabbit hole. If the capability of a T31 is limited to a medium 57mm gun, a dozen CAMM and a helicopter hangar, then the comparison is not difficult to make.
I agree with donald_of_tokyo, the RN should “stick to 30mm(+LMM) and 57mm”, there is no requirement for a second new gun caliber.
The 57mm is the right way to go - the effective range of the 40mm is @6.5nm, the 57mm is nearer 10nm (30mm range is @3nm and LMM around 4nm). Providing a 10nm radius protective bubble for operations gives the ability to keep attacking ships with similar small caliber guns out of range. Coupled with a LMM armed UAV/Wildcat hangar allows that protective bubble to be maintained either further - for what is a modest cost.
Adding a 12 cell CAMM launcher, does add cost and complexity, but increases the protective bubble against air threats to @14nm. Also, when combined with a 57mm and a LMM armed UAV/Wildcat, it removes the need completely for a Frigate escort which given the very limited numbers is the right thing to do.
I accept that to afford this could be as much as £100mn per vessel, and therefore 2 T31s sacrificed to arm 8 (F)MCMVs but that’s my view.