"Explanatory memo and calculations for the T-29 technical project (convertible drive tank T-29CN)
The proposed technical project of the T-29CN vehicle is a medium tank weighing 35.5 tons, meant for combat in a well reinforced area, suppressing large enemy concentrations, destruction of concrete fortifications, and fighting tanks.
Comparative characteristics of the T-29, T-29C, and T-29CN.
Catergory | T-29 | T-29C | T-29CN |
Vehicle type |
Medium, convertible drive
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Combat mass, tons | 27.5-28 | 30.5 | 32-32.5 |
Size
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Length (of hull), mm | 6670 | 6900 | 7000 |
Width, mm | 3180 | 3180 | 3200 |
Height, mm | 2820 | 2940 | 2980 |
Clearance on tracks, mm | 500 | 500 | 545 |
Track width, mm | 500 | 500 | 500 |
Armour (hull)
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Front | 30 | 30 | 30 vertical |
Side | 20 sloped | 30 sloped | |
Roof | 8 | 15 (front), 10 (rear) | 20 (front), 15 (rear) |
Floor | 10 | 15 (front), 10 (rear) | 20 (front), 15 (rear) |
Armour (main turret)
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Side | 20 vertical | 20 sloped | 30 sloped |
Roof | 10 | 15 | 15 |
Armour (machinegun turrets)
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Side | 20 vertical | 20 sloped | 30 sloped |
Roof | 10 | 15 | 15 |
Armament
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Gun | KT-27 | L-10 | L-10 |
Caliber |
76.2 mm
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Amount |
One
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Machineguns, type and caliber | 5 7.62 mm DT | 5 7.62 mm DT 2 12.7 mm DK |
5 7.62 mm DT 2 12.7 mm DK |
Ammunition
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76.2 mm shells | 67 | 102 | 94 |
7.62 mm bullets | 6678 (106 belts) | 6300 (100 belts) | 6300 (100 belts) |
12.7 mm bullets | 0 | 1500 (30 belts) | 1000 (20 belts) |
Crew | 5 | 6 | 6 |
Gun angle, horizontal | 360 | 360 | 360 |
Gun angle, vertical | -5 to +25 | -5 to +65 | -5 to +65 |
Machinegun turret angle, horizontal | 180 | 180 | 180 |
Machinegun turret angle, vertical | -7 to +25 | -7 to +25 | -7 to +30 |
Machinegun on the main turret | 360 degrees, +/- 15 elevation | 360 degrees, +/- 15 elevation | 360 degrees, +/- 15 elevation |
Speed on tracks
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First gear, 1450 RPM | 8.1 | 8.1 | 5.37 |
Second gear, 1450 RPM | 16.8 | 16.8 | 10.4 |
Third gear, 1450 RPM | 33.5 | 33.5 | 19.4 |
Fourth gear, 1450 RPM | 56 | 56 | 33.4 |
Fifth gear, 1450 RPM | - | - | 52.0 |
Reverse | 8.1 | 8.1 | 5.44 |
Maximum speed, 1700 RPM | 65.6 | 65.6 | 61.0 |
Fuel capacity, in liters | 720 | 800 | 870 |
Range
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On tracks, off-road, km | 190 | 160 | 160 |
On wheels, on average road | 220 | 200 | 200 |
Passability | |||
Trench in first gear, width in meters | 3.3 | 3.4 | 3.5 |
Escarpment in first gear, height in meters | 0.9 | 0.9 | 0.95 |
Water depth | 1.3 | 1.3 | 5 (underwater) |
Grade, degrees | 35 | 35 | 40 |
Maximum tilt (motion), degrees | 15 | 15 | 30 |
Maximum tilt (tipping over), degrees | 45 | 45 | 45 |
Ground pressure (no sinking) | 0.744 | 0.775 | 0.77 |
Ground pressure (100 mm deep) | 0.68 | 0.712 | 0.7 |
Special equipment
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Smoke launcher | Yes | Yes | Yes |
Flamethrower | No | Yes | Yes |
Special equipment of tank T-29CN
- Starostin's smoke launcher, with reserve: one
- Fanned out flamethrowers in the rear with a range of 25 meters and fuel for 15 shots: two
- Chemical protection device: good for two hours in poisoned atmosphere
- Watertighness for underwater presence: good for one hour
- Crew: 1 commander, 1 driver, 2 gunners, 2 machinegunners.
- Fuel capacity in two tanks: 870 liters
- Oil reserves: 65 liters
- Engine: M-17, 675 hp with 1450 RPM. Water cooled, axis type cooling fan, engine can be started with an inertial electric starter or by hand.
- Transmission:
- Main friction clutch: dry three-disk friction clutch with Ferodo lining.
- Pedal force required: 31.5 kg.
- Gearbox: parallel, five gears forward, one reverse.
- Steering mechanism: dry multi-disk metallic friction clutch, up to 20 kg of force for actuation.
- Brakes: ribbon type, metallic with Ferodo lining, actuated by foot pedal or levers. Used for braking the vehicle and controlling descent on slopes up to 45 degrees. Force required for levers: 15 kg, foot pedal: 33.6 kg.
- Final drives: two.
- Wheel drive gearboxes: six.
- Intermediate shafts for wheeled travel: four.
- Driveshaft: spicer type: six.
The transmission allows for constant synchronization of wheeled and tracked drive, allowing motion and control with one broken track. - Suspension: BT type, with ten doubled coil springs and 8 oil shock absorbers for 8 rear wheels.
- 10 independent road wheels, 840 mm in diameter, with elastic doubled tires, 2 by 175 mm. 6 wheels are drive wheels. Two wheels are support wheels. Two wheels can be steered with in wheeled mode.
- Upper suspension: 8 rigidly attached return rollers, 350 mm, rubber lining.
- Idlers: metallic, with tightening device inside the hull: two.
- Track: metallic, stamped, 150 mm by 500 mm track link, heigh with track teeth: 175 mm. Amount of tracks: 198-200 per vehicle.
- Communications:
- Radio NTK-1
- Colour semaphore
- Signal flags
- Internal TPU communication device
- Electric equipment:
- G-030 generator, 3 kW
- Type 6-SG-E144s battery: 4
- Turret motor: 1.65 kW
- IS-5 starter: 0.25 kW
- Headlight
- Headlight for night shooting
- Electric lights in the tank, backlight for instruments, stop signal, horn, regulator relay, etc.
- Starter magneto: 1
- Magneto motors: 2
- Range: 160 km on tracks off-road, 200 km on wheels on a highway.
- Size:
- Length: 7300 mm
- Width: 3200 mm
- Height: 2980 mm
- Clearance:
- On tracks: 545 mm
- On wheels: 490 mm
Chief of SKB-2, Kotin
Project manager, Tseits
Meeting minutes from January 13th, 1938
Printed on February 19th, 1938"
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