T-29CN

The T-29 wasn't just singular project, turns out there were two more vehicles on its chassis. From the V. Lehn collection:

"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
Combat mass, tons	27.5-28	30.5	32-32.5
Size
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)
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)
Side	20 vertical	20 sloped	30 sloped
Roof	10	15	15
Armour (machinegun turrets)
Side	20 vertical	20 sloped	30 sloped
Roof	10	15	15
Armament
Gun	KT-27	L-10	L-10
Caliber	76.2 mm
Amount	One
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
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
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
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
Smoke launcher	Yes	Yes	Yes
Flamethrower	No	Yes	Yes

Special equipment of tank T-29CN

1. Starostin's smoke launcher, with reserve: one
2. Fanned out flamethrowers in the rear with a range of 25 meters and fuel for 15 shots: two
3. Chemical protection device: good for two hours in poisoned atmosphere
4. 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"