ST-66 (USSR, MT-8, premium) was released for the WoT supertest. It does not have any special track mechanics [although there should have been a couple more tanks with it!].
Here are the characteristics and appearance. For what and how is unknown.
Historical background
The development of the draft design of the NST (new medium tank) was carried out in 1966. One of the features of the project was a 4-bypass chassis with a drive for each bypass. A transmission with a hydrostatic transmission made it possible to regulate the amount of power transmitted to each track bypass. The project did not progress beyond the drawings.
Crew of 4: Commander (Radio Operator); Gunner; Driver; Loader.
Role in battle: Assault medium tank.
Special equipment category: Mobility.
It has no special track mechanics, although there should have been a couple more tanks with it!
Full preliminary stats – 100% crew
Average damage: 300/300/400
Average armor penetration (mm): 217/290/50
Rate of fire (rounds/min): 7.63
Loading of the gun (sec): 7.86
Turret Traverse Speed (deg/s): 36.5
Hull Traverse Speed (deg/s): 41.72
Gun elevation/depression (deg): -6/15
Aiming time (sec): 2.01
Accuracy at 100 m: 0.35
Average damage per minute: 2,290
Strength (HP): 1,250
Hull Armor (frontal/side/rear in mm): 120/60/45
Turret Armor (frontal/side/rear in mm): 250/100/60
Track Repair time (sec): 10.03
Maximum weight of the machine(t): 40/41.5
Engine power (hp): 720
Specific power (hp/t): 18
Max. speed/reverse (km/h): 50/16
Stationary vehicle camo (%): 13.45/2.96
Moving Vehicle camo (%): 10.09/2.22
View Range (m): 370
Crew of 4 people: Commander (Radio Operator); Gunner; Driver; Loader.
Category of special equipment: Mobility.
source – wotexpress eu