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Muzzle velocity vs. the firing ship's current speed

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*Nerd Alert* Physics are involved in the discussion.

 

Muzzle velocity, air drag, and enemy ship's current speed are the major deciding factors on how one should lead to hit the designated target. How people should lead also depends on the direction of the enemy is heading towards. You lead a little less when the enemies are heading towards you, and lead a little more on the opposite.owever, I am currently having a question on whether the shell speed takes the firing ship's current velocity into the account.

 

The law of physics involved in the discussion is the Relative Velocity. For example: If you are sitting in the moving care with 20 m/s speed perceived by the observer on the ground. You are also moving 20 m/s according to the stationary ground observer, but you are stationary according to the observer sitting in the same car as you. In this same example, if you are firing the projectile with 200 m/s speed according to the people on the car in the same direction of where the car is moving, the ground observer will perceive that projectile moves at 220 m/s.

 

Now, in-game. Most ships will have the speed ranging from 20-40 kts, which translates to roughly 10-20 m/s of speed that would be added or subtracted to the described-in-game muzzle velocity. The amount is not very drastic, but the effect should be discernable if it is there. The question is that whether or not this effect exists in the game.

 

TL;DR: Suppose you have a North Carolina moving at 27.5 kts or about just over 14 m/s firing a shell at 701 m/s in the same direction of the ship's at near-zero elevation. Would the shell velocity at the exit of the barrel still be 701 m/s or increased to 715 m/s?

Edited by Admiral_Neptulussus

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Super Tester
1,634 posts
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Yes, you are correct in that physics should be following what you wrote, but I am certain that it is not counted in the game.

Edited by Haku

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Alpha Tester
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Are you saying if you move forward faster

The farther your shell can fall?

It does not work like that

The shell are propelled by the Explosion inside the Barrel, not by the force caused by The ship speed, so the amount of changed caused by that is nearly zero

The shape and design of the Barrel also mainly affects the muzzle velocity of the shells

 

 

Edited by Harpoon01

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Super Tester
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Are you saying if you move forward faster

 

The farther your shell can fall?

 

It does not work like that

 

The shell are propelled by the Explosion inside the Barrel, not by the force caused by The ship speed, so the amount of changed caused by that is nearly zero

 

The shape and design of the Barrel also mainly affects the muzzle velocity of the shells

 

In what world?

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In game, Im sure it was not simulated. I dont think any game simulated to that extend either, it would eat quite processing power for trivial physics, that have almost nonexistent impact to the game

 

In real life, this was exist

but on Naval combat its still trivial and very much ignored. since the shell trajectory were curved not straight line.

if the target lets say 20km, the barrel would be elevated. and the real battleship would go broadside to fire - to avoid damaging the ship itself (There is one particular incident when USS IOWA firing with only 15 degree angle from the bow. the shock from 2nd Turret ripped the first turret electrical system, the canvas protector of 1st gun turret were destroyed, The 1st Turret were crippled with everyone there were having concussion. turret 1 were dark, un-operational with most of the crew laying in floor, and the rest screaming in confusion)

 

Those relative velocity were however integral part of Air war. since the aircraft were fast, and their armanent were build for forward facing.

Infact, most of the Missile specification in specification sheet including the air speed of the aircraft its firing

Like the AIM-120 AMRAAM listed to have maximum speed of 4 Mach. If its launched from ground vehicle that 0 elevation and 0 speed, it wont even reach Mach 3

Fighter Pilot learn this too, its part of conservation of energy which crucial when in Dogfight

Edited by humusz

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Alpha Tester
6,604 posts
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In game, Im sure it was not simulated. I dont think any game simulated to that extend either, it would eat quite processing power for trivial physics, that have almost nonexistent impact to the game

 

In real life, this was exist

but on Naval combat its still trivial and very much ignored. since the shell trajectory were curved not straight line.

if the target lets say 20km, the barrel would be elevated. and the real battleship would go broadside to fire - to avoid damaging the ship itself (There is one particular incident when USS IOWA firing with only 15 degree angle from the bow. the shock from 2nd Turret ripped the first turret electrical system, the canvas protector of 1st gun turret were destroyed, The 1st Turret were crippled with everyone there were having concussion. turret 1 were dark, un-operational with most of the crew laying in floor, and the rest screaming in confusion)

 

Those relative velocity were however integral part of Air war. since the aircraft were fast, and their armanent were build for forward facing.

Infact, most of the Missile specification in specification sheet including the air speed of the aircraft its firing

Like the AIM-120 AMRAAM listed to have maximum speed of 4 Mach. If its launched from ground vehicle that 0 elevation and 0 speed, it wont even reach Mach 3

Fighter Pilot learn this too, its part of conservation of energy which crucial when in Dogfight

 

Torp bomber and Dive bomber also count

especially Naval AP Dive Bomber

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Torp bomber and Dive bomber also count

especially Naval AP Dive Bomber

 

Its scope were very limited really 

weight is more matter, according to US ONI the terminal velocity assisted by aircraft help, but it dont matter much

 

The only other things that matter would be the angle the bomb fall when its impacted the ships

Compared to level bombing at same height, dive bombing increase the penetration by 173% when released at 1200 feet. and 250% when release at 400 feet from the target

Due to aerodynamics of WW2 bombs, they bleed speed fast. even more fast if the bombs were light

in the end it make more sense for them to go for heavier bombs, than go to risky dive bombing procedure

 

IJN also does the same, lets make 800kg AP bombs using refurbished 16inch Naval gun shells

brute forcing theway in is easier :x

Edited by humusz

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