Now that all the CRV bids are in and being assessed, I wonder how important the bidder's choices of main gun will be in deciding the eventual winner. Most of the focus has been on the various hulls offered but to my mind the choice of main gun is shaping up as an area where one of the bidders clearly stands out. Three of the bidders are offering 30mm main guns but the AMV35 will come with a 35mm Bushmaster III cannon. Although a 5mm diameter difference seems trivial the increase in kinetic energy of the 35mm round over the 30mm round is enormous.
The CRV tender protection requirements themselves indicate how important this difference may be. CRV is aiming for protection from 30mm AP but will be vulnerable to 35mm AP. Very few IFV/APCs would offer protection from rounds larger than 30mm. This extra lethality, along with the availability of a 35mm KETF round, which allows the 35mm cannon to effectively put a MBT out of action at ranges up to 4000 metres would seem to offer it a decisive advantage over 30mm guns.
If I was choosing the CRV winner, I think I would take a lot of persuading that the AMV is not the best choice and that mainly comes down to it's 35mm gun.
All 4 offered hulls seem "reasonably" similar in design. It is only in the choice of main gun that one option stands out from the others.
Interested to hear what other people think?
For me I wonder about ammunition capacity (amongst other things). I understand that fewer 35mm rounds should be required to do a job versus the 30mm, however it is also bigger and heavier recoils more. Is that important in a 30+ tonne vehicle I don't know?
Here are a few bits I have gleaned for the purpose of comparison:
ASLAV 25 (as a point of reference)
Calibre 25×137 mm
ready rounds 210 rounds
stowed rounds 510 rounds
barrel mass 49kg
total weapon mass 120kg
recoil force 45kN
weapon length 2.572m
HE projectile has a mass of 180 g.
CV9030
Main armament 30 mm Bushmaster II/MK44 cannon, dual feed
Calibre 30 mm x 173 mm
Am. types APFSDS-T, MPLD-T, TP-T
ready rounds 2 x 80 rds (dual feed)
stowed rounds Typical 240 rds
barrel mass 69kg
total weapon mass 156kg
recoil force 36kN
weapon length 3.405m
HE Projectile has a mass of 362 g
CV9035
Main Gun: ATK Bushmaster III 35mm Autocannon
ready rounds 70
stowed rounds 280 (alternate source 173)
Calibre 35 x 228mm
Default Ammunition "A": 35/140 NMxxx APFSDS, 35/140 ABM M/XX LS (ABM/KETF)
barrel mass 127kg
total weapon mass 231kg
recoil force 63kN
weapon length 4.018m
HE Projectile has a mass of 550 g
I found a thread on tanknet (FWIW) covering the 30mm vs 35mm debate
CTA40 Cannon - AFV Forum - tank-net.com
Personally I have been intrigued by the CTWS (CTA 40) and am a little disappointed it doesn't seem to be in the mix for Land 400. However I can understand the ADF's reluctance to adopt such a new system where we would have commonality with only the brits & the french.
The yanks seem to be leaning toward the 30mm so I suspect that might count for something.
rb