***who about get the old T-72 and made them like The BMPT for infantry, but with Berezhok turret
and maybe a-45/57 gun?
The right idea but wrong implimentation.
The BMPT is a fire support vehicle to help tanks operate or to protect convoys.
In afghanistan the equivalent of a BMPT was not a BMP-2, it would have been a Shilka.
Utilising the larger turret ring of the T-72 if you could redesign the Berezhok turret to move the two turret crew below the turret ring level to give them best protection and a new gun as you suggest would be a very good idea in my opinion.
The catch is that the whole concept of the Armata is to separate the crew from the fuel and ammo, and introducing a heavy gun like a 45/57mm weapon puts lots of propellent and HE charges in the crew compartment...
Basically I see the BMPT as a separation of the heavy firepower of the BMP out of the troop carrying role to separate the crew and troops from all that ammo.
The result is that the troop transports will have 14.5mm HMGs and 30mm cannon but not the direct and indirect firepower of the 100mm gun of the BMP-3. The question is, how do you restore that firepower to the heavy brigade because while tanks can deal with medium to long range targets they are not so good at aiming at close in targets.
The BMP-3 could use its 100mm gun against such targets but in close in combat its thin armour makes it very vulnerable.
The solution was the BMPT, but as mentioned elsewhere adnauseum by me I think it needs the following changes:
Use the BMO-T as a chassis concept with the Armatas heavy armour as the actual chassis (BMO-T has more headroom in the chassis).
Change the two 2A42 30mm cannon for a single GSh-30-2... uses the same ammo, but has the option to fire at a slow rate and also at a much faster rate for aerial targets and it is lighter than 2 2A42s.
Add a 100mm rifled gun from the BMP-3, whose weight will help improve the accuracy of the 30mm weapon in all firing modes, and will give relatively accurate HE power out to 7km and very accurate anti armour capability out to about 5.5km and would replace the ATAKA missiles.
Front roof mounted external gun positions for a combo of a PKT and Balkan 40mm grenade launcher on each side of the hull designed to fire back and sideways as well as forward.
The result would be more room for ammo, better use of the 30mm rounds carried from a long barrel high velocity weapon, direct fire HE that is relatively cheap out to about 7km replacing the 4 ATGMs with up to 8 laser beam riding gun tube launched ATGMs, and of course the two hull front roof mounted weapons allow a total of three targets to be engaged at once... the PKT could reach to 1km but the Balkan can engage targets out to 2.5km.
****In my opinion I see two “fire support vehicles”: one is the BMPT and one is the BMPI.The BMPT will escort the tanks, and the BMPI will escort the infantry.
The BMPT will be part of the tanks brigade and will use the chassis of the T-72. When the Armata platform will be available, the BMPT will be built on it, till then it’s better to use the T-72s then throw them away
The BMPT will have a crew of 4: driver, 1st gunner, 2nd gunner, and commander. All of them will be seated under the turret’s ring.
Before we can make any suggestions on weapons, we need to define is the roll of the BNPT in the tank brigade. The main enemies of the tank, in our days, are not the enemy’s tanks, but the tanks killer’s teams, equipped with ATGMs and RPGs.
The main defence, but not the only one, against ATGMs some with range of up to 8 km, is the ADS hard-kill and soft-kill system. To defend the tanks against the RPG teams we will call the BMPTs. To defend the tanks, we will replace the T-72’s turret with the Berezhok turret, but we will also, replace the 30mm 2A42 gun with, as you said, the GSH-30-2 cannon with HEAB ammo, and 14.5mm HMG as coaxial gun. The 4 ATGM Kornet EM will have a thermobaric warhead and every missile can be swapped for four 80mm guided rocket.
In my opinion, BMPT needs to have two channels of viewing and firing. 1st channel will be for the GSH-30 and will be operated by the 1st gunner. For the second channel, we will install RWS on the roof of the turret that will be operated by the 2nd gunner. The RWS will be equipped with GSH-23L cannon and PKT as a coaxial MG.
These weapons have high rate of fire, HEAB munition, and tarmobaric warhead will be the right answer to these tank killer’s teams, and keep them away from the tanks.
The BMPI will be part of the infantry brigade and will have a different roll than the BMPT. His roll is to be the spear head of the infantry attack. But, as the infantry brigade has fewer tanks, the BMPI will have to have enough fire power to engage IFV, APC, soldiers in the open, in houses, in bunkers etc.
To deal with all these challenges, the BMPI will have a 45mm gun instead of the GSH-30-2 gun. The 45mm gun is a good compromise between the 100mm and the 30mm guns of the BMP-3. The other weapons system, like the Berezhok turret, the 14.5mm HMG gun, the ATGM missiles and the RWS will stay the same.