NAVAL ORDNANCE for naval rotc mode.pptx

To have basis, for those who are in ROTC. This is essential to help you about the ordinances of a navy.

1. NAVAL ORDNANCE Military Science-2

2. SCOPE OF PRESENTATION Definition of Terms Gun Ammunition Recognition Handling of Ammunition Safety Procedures A. Intro to Ordnance B. Types of Naval Guns 40 MM 20 MM 3’50 Gun .50 Cal. BMG

3. LEARNING OBJECTIVES After the class discussion, the students are expected to: Be able to define the Naval Ordnance Be able to recognize the gun ammunition Be able to know the proper handling of ammunition Be able to identify the types Naval Guns

4. INTRO TO ORDNANCE

5. A. DEFINITION OF TERMS: ORDNANCE – comprises the physical equipment pertaining to weapon, classified as explosive ordnance and inert ordnance. GUNNERY – the art and science of using guns to include the operation and control of all elements of armaments. BALLISTICS – the science of projectile’s motion classified as; Interior Ballistics and Exterior Ballistics.

6. Cont’d FIRE CONTROL -the practical application of exterior ballistics and the methods and devices used to control the guns and other weapons. CALIBER OR GUN - the diameter of the bore measured between the top of the lands and its expressed in inches or millimeters. 6. MOUNT - support and secure the gun to the ship's structure and provides for the train and elevation.

7. 7. TRAIN - the position of the axis of the gun bore in azimuth as measured from the ship's centerline. 8. ELEVATION - the angle that the gun bore axis makes with the deck measured in a plane perpendicular to the deck. 9. RECOIL - the force tending to push the gun to the rear as the projectile is discharged. It is the gun's reaction to firing. Cont’d

8. 10 . COUNTERRECOIL - the forward movement of the gun after recoil which return the gun into battery or original position. 11. IN BATTERY - gun is said to be in battery when the gun is in its firing position. A gun moves out of battery during recoil and returns to battery during counter recoil. Cont’d .

9. AUTOMATIC GUN - guns in which some of the energy of explosion of the propellants is used to open the breech, eject the empty case and automatically load another round. Automatic gun can continue to fire as long as there is enough supply of ammunitions and trigger is pressed. SEMI-AUTOMATIC GUNS -guns in which some of the energy of the explosion of the propellants is use to open the breech, eject the empty case, and automatically closed the breech when another round is loaded either by hand or by auxiliary equipment. Cont’d

10. NON-AUTOMATIC GUNS - guns in which none of the energy of the explosion of the propellant is used to perform breech opening or loading and unloading functions. AXIS OF THE GUN BORE - a straight line passing through the center of the gun bore. Cont’d

11. Only use the correct ammunition for your firearm. Check the condition of ammunition before you use it. If it is dented or appears to be irregular in any way, don't use it. Secure ammunition and keep it away from excessive heat or impact with sharp objects. Handling of Ammunition Safety Procedures You must follow several rules for safe ammunition handling, carrying or storage. They are:

12. Store ammunition in original container or ammo box. Lock up ammunition and firearms separately. Do not mix different size cartridges and shell sizes. Keep them separate. Only use round or soft-point ammunition in tubular magazines. Cont’

13. GUN AMMUNITION RECOGNITION GUN AMMUNITION - are those ammunition used in guns:

14. Projectile – contains the buster charge, fuse and/or tracer Components of gun ammunition :

15. Propelling Charges – explosives that propels the projectile out of the gun bore.

16. Primer – initiates the burning of the propelling charges

17. TYPES OF NAVAL GUNS

18. Gun Data: 40 Millimeter Anti-Aircraft (40MM AA) Gun Weight of the gun - 2,300 lbs Muzzle velocity - 2,830 ft/sec Rifling - right-hand twist Number of grooves - 16 Length of recoil - 7.5-8 inches Max horizontal range -11,000 yards Eff range (horizontal)- 5,000 yards Eff range (vertical) -2,000 yards The 40MM AA gun is a single or automatic firing (rapid firing), recoil operated gun designed for action against dive bombing aircraft or low flying aerial targets but maybe used against surface targets.

19. 20 Millimeter Anti-Aircraft (20MM AA) Gun Weight of the gun -141 lbs Muzzle velocity -2,725 ft/sec Rifling - right-hand twist Number of grooves- -9 Max range (45° elev ) -4,000 yards Eff range (horizontal -2,000 yards Eff range (vertical) -1,200 yards Gun Data: The 20MM AA gun is a single or twin barrel, pedestal mounted, automatic firing, magazine-fed gun designed for action against low-flying aerial torpedo attack aircraft but can also be used against surface targets .

20. Gun Data: 3-inch 50 Caliber (3”/50) Single Gun Weight of the gun -7,817 lbs Muzzle velocity - 2,700 ft/sec Rifling - right-hand twist Number of grooves - 24 Length of recoil -10-11.5 inches Max horizontal range -14,600 yds Max vertical ceiling - 29,300 ft Eff range ( hor )- 8,000 yards Eff range ( ver ) - 4,000 yards The 3"/50 gun is a pedestal mounted, single or semi automatic firing, dual-purpose gun designed for action against surface and air targets.

21. Gun Data: Effective range- --600 yards Max Eff range— 7,400 yards Caliber of the bore .5/.50 inch Rifling- --Uniform RHT 1 turn in 15 inc Weight of gun without barrel- --56 lbs Weight of barrel- --28 lbs Land and grooves ---8 Length of gun- --65 1/8 inch (over all) Length of barrel ---45 inches Cyclic rate of fire--- 400 to 600 rds /min Muzzle velocity- --2,935 ft/sec (approx) Weight of ammo per 100 rds-30 lbs The .50 BMG cartridge is used in long-range target and sniper rifles , as well as other .50 caliber machine guns.

22. END OF TOPIC