After concluding trials of tank #1, it's possible to make the following conclusions:
- The tank has the following mobility characteristics:
- Maximum speed on a paved highway in packed snow: 39.96 kph
- Average speed:
- On paved highway in packed snow: 25 kph
- On dirt road covered in loose snow, 200-300 mm deep: 9-10 kph
- Off road with snow 300-450 mm deep: 6-7 kph
- The dirt road and off-road performance of the tank in 200-450 mm of snow is satisfactory.
- The tank remains stable during crossing of various obstacles (trenches, trees, grades, slopes).
- The front, side, rear, and turret armour is 13 mm thick.
- 9 observation hatches in the tank (not including the optical sight and two hatches in the machinegun mantlet) provide good visibility.
- The tank's suspension is elastic and functions satisfactorily during crossing of various obstacles.
- It is convenient for the crew to enter and exit the tank.
- Controlling the tank is easy and it does not take great strength to operate the levers or pedals.
- During trials, the engine worked flawlessly and was easy to start.
Drawbacks of the tank include:
- It's difficult to access the engine for service.
- The brake drums heat up from friction. The electric cooling fans installed to cool the brake drums are insufficient during long marches.
- The design of the idler and track does not prevent the track from slipping off.
- The idlers included in the rear bogey can move vertically in relation to the suspension axis, which results in the track slipping.
- The track tension adjuster is weak and does not offer enough travel.
- The front road wheel with an independent suspension cannot prevent the spring carrier attachment from breaking after an impact.
- The door-like hatches do not prevent flammable liquids from entering the tank.
- Fragments of shells or hand grenades that enter through the two rear exhaust openings will destroy the gasoline or oil tank.
- The tracks can easily be severed by a bundle of grenades or by being hit by a shell fragment.
New Designs Trial Department Chief, Military Engineer 3rd Class, Shmelev"