The chassis is the GM-352. It is much larger and heavier than BMD-4 and is definitely not air-droppable.
My mistake, but this:
The crawler-mounted system, codenamed Ptitselov (Fowler), is a hybrid of the well-known Pantsir-S2 cannon-missile system mounted on an air-droppable BMD-4M armored vehicle.
Read more: http://sputniknews.com/russia/20160507/1039232708/russia-missiles-defense.html#ixzz488uUI3dQ
Clearly says they are developing a tracked system called Fowler that is a hybrid of Pantsir-S2 and BMD-4M.
Well I guess we have to live with this until facts are no revealed. For me Sosna makes not really difference since is no tmuch lighter and by order og magnitude worse solution.
Actually as it is supposed to be replacing the SA-13, which in turn replaced the ZU-23 it is actually an enormous step up in performance... double the range with a time of flight to 10km of about 12 seconds... able to engage PGMs as well as aircraft and cruise missiles...
Note the Navy is also adopting the SOSNA in smaller vessels and Pantsir-S in larger vessels.
Besides 20km range to take down is real advantage for troops in area or concentration after drop.
Only if you can detect enemy aircraft at that range...
that is a lot of extra infrastructure they will have to carry around...
IMHO 57mm module with 200/300 ammo can make bette real than Sosna. Longer range and ceiling.
Not going to happen... even in a vehicle the size of the PT-76 they could barely get 80 rounds in that.. . a BMD-4M is much much smaller.
Sosna is far lighter than Pantsir. Simply count. Pantsir have two big radars, search and tracking radar with missile guiding radio transmitter. Two radars also mean more computers and processors, etc. Than you have to count additional power supply unit, that the complex could work. Tracked Pantsir is placed on GM-355, which is also used for Tor and Buk complexes and have enough space for all needed components. Buy the way, Tor is weighting 34 tons and tracked Pantsir for sure have similar weight as Tor. GM chassis weight 24 tons, so the rest of the complex weight 10 tons. Placing Pantsir in BMD-4M is the same as placing Tor-M2 in it.
I agree, but I think they have probably decided that a reduced Pantsir would allow engagement of aircraft before they fire their missiles, so overall would use fewer weapons than the shorter range SOSNA that would just have to deal with all the incoming PGMs.
SOSNA is very much like a two stage Kornet... in fact it is only about 10kgs heavier in terms of missile size...
Other problem is, that for now no one knows, how radars and their electronics will survive air dropping. It is not designed for such shocks as they are with landing after air drops. Weak points are electronic cards, waveguides, hydraulics, etc. Any breaks in them mean, that the system will not work. For air dropping they will need to increase strength of construction, what mean increasing weight.
You just need to look up US experience in this... the Mauler I think it was called.