- TsKB-50: In accordance with the tactical-technical characteristics approved by the Committee of Defense of the SNK on December 11th, 1940, an experimental armoured aerosan must be developed, similar to the Tunguska sleds.
- NKVD factory #5:
- Assemble a full sized model in parallel with the design process, due on December 25th, 1940.
- Assemble a prototype by January 25th, 1941.
- The armoured aerosan hull can be split into three main parts:
- The armoured cabin with a T-40 type turret that contains the crew, armament, ammunition, and equipment. The hull and turret armour is 7 mm thick, the roof is 5 mm thick.
- The engine compartment. The sides are 7 mm thick and the roof is 5 mm thick.
- The front armoured compartment for fuel tanks and unarmored compartment for instruments and equipment.
- The propeller and engine group of the armoured aerosan consists of the M-103-A motor positioned in the rear section of the hull, covered by an armoured cap.
Water and oil radiators are installed under the motor for cooling.
- The armament of the armoured aerosan consists of an MP-6 23 mm gun with a coaxial DT machinegun and a TMFP sight.
The aerosan is also equipped with a PPD submachinegun to fire from the hatches (the horizontal traverse of the main gun is 280 degrees).
- The ammunition capacity of the aerosan is 308 shells for the MP-6 gun, 1890 rounds for the DT machinegun, 568 rounds for the PPD, and 20 hand grenades.
- The aerosan is controlled by the driver using brake levers and the steering wheel etc, positioned in the front of the cabin.
- Communication and observation: the aerosan is equipped with a KRSTB radio. Observation is performed through Izhor factory observation devices. The cabin and turret have five pistol ports for firing the PPD.
- The electrical equipment of the aerosan is done in the one-wire layout.
Electric devices are powered by batteries, which are charged by a generator attached to the M-103-A engine.
- Increased armour for the fuel tank.
- Crew of two instead of three.
- Mass of 4.7 tons as opposed to 3.5 tons in the requirements.
- The mass was 5360 kg instead of 4700 kg, approved by the Model Commission.
- Instead of a combat ready MP-6 gun, a used one was sent by OKB-16.
- The TMFP sight is absent (not sent by the People's Commissariat of Armament).
- 37 magazines for the MP-6 are absent.
- Total engine runtime: 2 hours
- Temperature range: normal
- Fuel pressure: normal
- Oil pressure: normal
- February 18th trials: 44 kph at 2350 RPM, air temperature of -7 degrees.
- March 4th trials, air temperature between -1 and +1 degrees:
- At 1700 RPM: 45 kph
- At 2000 RPM: 65 kph
The speed at 2400 RPM was not recorded as the aerosan left the measurement strip.
- February 16th: 100 km, nonstop work, 3 hours 35 mins
- February 26th: 45 km, nonstop work, 1 hour 30 mins
- March 3rd: 60 km, nonstop work, 2 hours
- March 4th: 140 km, nonstop work, 3 hours 35 mins