Gun System Components Flashcards
Barrel, breech, feed system, cooling system are part of what part of the gun?
Gun Structure
Recoil and laying systems are part of what part of the gun?
Mounting arrangement
“A tube capable of containing and controlling the explosion of a propellant charge so as to propel a projectile at high velocity. Provides stability and imparts spin to projectile.”
Barrel
“The portion of the barrel in which the ammunition is inserted prior to being fired. It is of a larger diameter than the bore and houses the casing of the round while the projectile rest in the bore.”
Chamber
“Interior of the barrel”
Bore
What type of rifling do modern naval guns have?
Right-hand
What does the spinning of the projectile do?
Gyroscopic rigidity, stabilizes the round
“A tubular insert that can be replaced when worn”
Bore liners
What are causes of eriosion to the bore?
Heating scouring the surface
Rapid heating and cooling
Hot gasses acting as high-velocity jets
Where does most of the wear on the bore occur?
Near the breech where rifling begins.
Why does bore erosion reduce muzzle velocity?
Gas escapes past the projectile, reducing pressure behind it.
Projectile may be rammed further into the gun, reducing the propeling in the chamber.?
Why must the muzzle be precise?
“reduce the signature of a gun by cooling or dispesing the burning gasses that exit the muzzle. Not typically used on guns above 40mm due to added mass and recoil.”
Flash Suppressors
“A device connected to the muzzle of a gun that redirects propellant gases to counter recoil and unwanted rising of the barrel during rapid fire”
Muzzle Brake
“The part of the gun barrel that slides back and forth in a bearing mounted in the gun slide during recoil”
Sliding Cylinder.
“The tapered area of the barrel, thicker walls to withstand higher pressure.”
Chase
“The thinnest part of the barrel running from the chase to the muzzle”
Neck
“Used on older guns. Metal is made thicker to discourage splitting.” (flaring out at the muzzle)
Bell
Modern version of a bell, used when the liner is replaced, to anchro the tool for pulling the liner out.
Lug
Two main categories of breech types
Screw type
Sliding block type
What is the mechanism by which breeches work to seal the chamber?
Sealing by Expansion
What is the advantage of a horizontally sliding breech block?
Don’t have to fight against gravity
“Opens the breech and operates the extractors during recoil”
Lever Breech Mechanism (LBM)
“Prevents the breech block from slamming into place during recoil to prevent damage. Brings the block gradually to rest in the open position.
Breech Buffer
“Lock the breech in place and hauls fired cartridge cases out of the chamber after firing.”
Extractors
“Imparts energy to the round required to initiate the propellant train”
Firing Mechanism
What are the two types of firing mechanisms?
Electrical
Percussive
Designed to absorb and dissipate the forces generatedby firing and return the gun to the firing position.
Recoil System
“Controls the length of recoil and the velocity of counter-recoil.” Contails a mix of air and hydraulic oil which is compressed upon recoil, dissipating energy by hydraulic dampening.
Recoil Cylinder
“Provides the force necessary to return the gun mechanism to the battery position, cock the rammer, and feed the new round”
Recoil Spring
What are 3 cooling systems?
Water cooled
Air cooled
Multiple barrels (CIWS)
“The process of aiming an artillery piece in training and elevation in order to aim at surface and air targets.”
Gun Laying system
Subsystem of Laying System: “Traverses the gun in the horizontal plane.”
Training System
Subsystem of Laying System: “Elevates and lowers the gun body in the verticle plane”
Elevating System
“All components on the gun body that pass ready-use ammunition to the firing point”
Feed System
How is the CIWS made mechanically safe?
Sector Holdback Tool
Holds back cams so they do not chamber the rounds.
“All components designed to store ammunition, transfer it to the gun mount, and handle ready-use ammunition on the mount”
Loading System
What are components of the loading system on the 57mm?
Magazine, hoist system, rounds receiver, loading cassettes, intermediate magazines
What are the major components of the gun mount?
Laying System
Recoil System
Slide
Trunnions
Carriage
Stand
Cupola
“A cylindrical casting within which the gun slides axially in recoil and counter recoil.”
Slide
“Provide the pivot point for the elevating system”
Trunnions
“The part of the mount that rotates in training.”
Carriage
“The stationary part of the mount which is bolted to the ship’s structure”
Stand
“Covers the gun and mounting to protect them from the surrounding environment.” Often radar absorbant, made of glass reinforced plastic.
Cupola
What are the components of a sliding breech mechanism?
Breech Ring
Breech Block
Lever Breach Mechanism (LBM)
Breech Block Buffer
Extractors
Firing Mechanism
What must a gun mount provide to the gun?
Support the gun body
Elevation and training
Recoil and counter-recoil control
Protection from the elements