Russian 220 mm/65 (8.66") SM-40

Russian
220 mm/65 (8.66") SM-40
Updated 27 August 2006

These guns were designed after World War II for the heavy cruisers of Pr. 22 and Pr. 66. After Stalin's death in 1953 all work on heavy ships was stopped and the Pr. 22 and Pr. 66 Cruisers were cancelled. Work on the turret design was halted at the same time, but it was decided to continue the design of the gun itself for experimental purposes. The prototype was completed in December 1953 and tests were conducted at Rzhevsk until November 1954. Not accepted for production.

. Looking for a picture .

Gun Characteristics .

Designation	220 mm/65 (8.66") SM-40
Ship Class Used On	Pr. 22 and Pr. 66 class Heavy Cruisers
Date Of Design	1953
Date In Service	N/A
Gun Weight	52.5 tons (53.5 mt)
Gun Length oa	563 in (14.3 m)
Bore Length	N/A
Rifling Length	N/A
Grooves	N/A
Lands	N/A
Twist	N/A
Chamber Volume	N/A
Rate Of Fire	5.8 rounds per minute design

Ammunition .

Type	Bag
Projectile Types and Weights	AP and HE - 388 lbs. (176 kg)
Bursting Charge	N/A
Projectile Length	N/A
Propellant Charge	206.13 lbs. (93.5 kg)
Muzzle Velocity	3,231 fps (985 mps)
Working Pressure	24.1 tons/in² (3,600 kg/cm²)
Approximate Barrel Life (see Note)	600 rounds
Ammunition stowage per gun	120
Note: With such ballistics and working pressures, I would consider the life figure to be on the optimistic side.

Range .

Elevation	With 388 lbs. (176 kg) AP Shells
Max Range	54,035 yards (49,410 m)

Mount / Turret Data .

Designation	Triple Turrets Pr. 22 (3) and Pr. 66 (3): SM-6
Weight	656 tons (665 mt) for the rotating part of the turret 719 tons (730 mt) total weight of the turret
Elevation	-4 / +50 degrees
Rate of Elevation	11 degrees per second
Train	360 degrees
Rate of Train	5.5 degrees per second
Gun Recoil	N/A
Loading Angle	+5 degrees

Data from
"Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland [Russian] Artillery) by A.V. Shirokorad
Special help from Vladmir Yakubov