A russian scientist wanted to develop a new superweapon : Time travel.
So he arranged for a experiment to be made. A tank and its crew was transported back in time to 1941. But there was a problem : They are unable to return to 2000. Locked in 1941 they are now enlisted in the soviet army to defend the motherland versus the hordes of the nazi-fascism.
The T-90 tank is used in the Battle for Moscow where it showed its mighty against german tanks. Superior mobility, armour, firepower and sighting, and help from KV-1's and KV-2's in protecting its flanks, allowed it to hunt down a whole battallion of Panzers and help hasten the fate of the german offensive in moscow. (Dont care if this is feasible or not, thats not the question).
Now that matters are less dire for the Soviet army, the tank was taken back from front line and sent to test grounds where it is being examined by engineers from all soviet tank factories.
What can the Soviet period engineers develop based on technology taken from said T-90 ?
- Can the engines be reproduced with the period tech ? (Even if you have to remove the eletronic engine controls and revert back to mechanical governors etc)
- Can the gun be reproduced ?
- Can the armour be reproduced ? Is there anything on composite armours that is too complex for the period or simply having the armour cut in half to look inside is enough to determine the materials it was made from ?
- Can the ammunition be reproduced ? (Even if the 9M119 guided rounds are ignored as too complex)
You may discount all the eletronic devices that are based on integrated circuits as this is hard to reproduce. But the mechanics of the machine are more advanced than WW2 tech but still within reach ?
Sorry for the total rewrite of the question.