Heavy Triplex

"Tactical-Technical Requirements for a 254 mm gun, 305 mm howitzer, and 400 mm mortar on a T-35 chassis

Main requirements:

Item	254 mm gun	305 mm howitzer	400 mm mortar
Range (km)	*	21	13
Combat mass (tons)	55-60	55-60	55-60
Travel mass (tons)	55-60	55-60	55-60
Shell mass (kg)	200-240	340	640
Vertical traverse arc (degrees)	55	65	70
Horizontal traverse arc (degrees)	10	10	10
Rate of fire (RPM)	1	1/2	1/3
Time to deploy from travel to combat mode and back (minutes	5	5	5

*Muzzle velocity and range depend on final choice of shell

Requirements:

• Stress on suspension elements must be evenly distributed.
• The system must be stable in motion when tilted at least 20 degrees.
• The system must be able to traverse a 35 degree grade.
• The ground pressure must be 0.6-0.7 kg/cm^2.
• The maximum speed should be 20 kph.
• The system must have enough fuel to run for 6 hours.
• The system must be able to cross a 4.5 meter wide trench.
• The system must be able to ford a 1-1,1 meter deep water hazard.
• The height of the tow hook must be 1 meter.
• Access to the engine and control mechanisms must be convenient.
• The SPG should fit within the dimensions of a railroad car.
• The chamber should accept existing 10 inch and 12 inch land and naval artillery shells."

V. Lehn Collection