Naval Weapons Flashcards
What are the 4 classifications of Sea mines?
Case shape
Method of launch
Position of mine in the water
Method of firing
What does NEQ’s stand for?
Net explosive quantity
What are the 5 categories of Naval weapons?
Sea mines Torpedoes Depth charges Limpet mines Marine pyrotechnics
What are the 4 shapes of sea mines?
Spherical
Cylindrical
Capsular
Special
What are the 4 methods of launching sea mines?
Aircraft
Surface craft
Submarine
Hand
What are the 4 positions in water for sea mines?
Buoyant/moored
Ground/bottom
Drifting/oscillating
Very shallow water (VSW)
What are the 2 methods of firing sea mines?
Contact
Influence
What are the 4 methods of firing influence sea mines?
Magnetic
Acoustic/seismic
Pressure
Combination of all 3
What are the 7 types of contact sea mine firing systems?
Galvanic Chemical horn Le clanche Horn Hydrostatic horn Impact inertia Switch horn Snag line
How many pounds of force is required to operate a switch horn?
7 pounds of force
What are the 5 different types of influence firing systems?
Magnetic Acoustic Seismic Pressure Combination of any of the above
How is it possible to ID a magnetic firing system?
A large hexagonal nut may be present on older mines (coiled Rod unit)
At what distance from the mine do we need to be metal free?
25 m
What would a smooth rubber diaphragm indicate?
Acoustic or seismic firing system
What are the acoustic and seismic precautions regarding sea mines?
Cease all unnecessary noise within 25m
Use 1 in 3 rule within 10m of the sea mine
What are the safety precautions for depthcharges?
Approach side on as the sensors will be on the ends
What does a gold metallic disc at the rear of the sea mine indicate?
Very sensitive magnetic and seismic firing device aka the golden arsehole
There will also be 4 white lines on the rear
What are the 4 main parts to a torpedo?
Guidance
Warhead
Energy
Proportion
What are the 2 key ID features for torpedoes?
Number of propellers
Number of blades
What are the 4 classifications of torpedoes?
Launch
Proportion
Guidance
Firing
What are the 5 methods of proportion for torpedoes?
Air steam Chemical air steam Electric Solid propellant Liquid propellant (otto fuel)
What are the 4 methods of firing a torpedo?
Impact
Impact inertia
Influence
Combination of the above
What are the recce procedures for torpedoes?
Strip all metal off any ICP
Approach torpedo from the rear quarter and upwind if possible
At 25m eliminate all unnecessary noise
At 10m all movements are 1 in 3
After approaching a torpedo if proportion section is still warm back out it may still think it’s hunting a target
Take dimensions without touching the torpedo
Determine firing system if possible
Impact (whiskers)
Influence (no external features)
Propeller specs are key to ID i.e. number of props and blades per prop
What are the arming and firing system for depthcharges?
Hydrostatic for both arming and firing are the most common
What is the main safety precaution with depth charges?
Allow 1 full tidal cycles before approaching the depth charge if possible
What are the 2 key features of limpet mines?
The most common firing device will be time
Most will incorporate anti-removal device
What are the 6 method of attaching limpet mines?
Magnetic (most common) Clamps Adhesive Suction Floats Rope
What is the most common firing method of a marine pyrotechnic?
Cocked striker
What are the safety precautions for marine pyrotechnics?
Toxic fumes and gases may be given off allow a 30 minute soak
Always destroy in a upwards direction to allow contents to burn off
What diameter of submarine launched torpedoes?
21 inches
What must you always assume until you can rule out regarding naval weapons?
Influence means of initiation
