A Riddle for Destroyer Drivers

[Compassghost]

You are driving in a Minekaze, minding your own business, when, off to your starboard side, heading in your direction, you spot a battleship!

 

The battleship, a Kongo, appears to be traveling at full speed making directly towards you, oblivious to the fact that you are there! It looks to be making about 30 knots and seems intent on fighting your Wyoming 20km to your port side, and nothing else.

 

You line up for a fair spread to account for the Kongo possibly turning , as well as not changing course at all, and immediately fire your tubes when the Kongo's range reads 10.0km.

 

You realize to late you do not have the 10km torpedo tubes equipped. You actually the 7km/68 knot torpedo tubes instead.

 

Assuming the Kongo is too busy reading these forums to change course to avoid your torpedoes, do you hit the Kongo?

 

 

This should be interesting.

 

Answer in Spoiler Tags!

 

 You do hit the Kongo, assuming it doesn't deviate, and that you aligned a torpedo to hit it head-on.

 

We know the velocity and the distance, and potentially the time of our torpedoes. With this, we can calculate how far the Kongo will travel, using its knot-speed and solving for xkm, seeing as t is constant for both the Kongo and the torpedo once they collide.

 

The distance the torpedo travels is 7km ->, the distance the Kongo travels is <- 3.09km, which means that they would in fact collide.

 

[Flagship_Amagi]

not in the game. The torpedoes fiz out and stop....they will not go beyond the range they are specified to go. at least thats what i have seen....

 

did you hit it?

[Compassghost]

not in the game. The torpedoes fiz out and stop....they will not go beyond the range they are specified to go. at least thats what i have seen....

 

did you hit it?

 

Hint: The battleship is moving towards you at 30 knots. If it were parked at 10km, of course not

[CasualCat2001]

Maybe.  It is closing so the torpedoes don't actually have to go 10km.  I don't know how far in game a ship can go in ~40s though. 

 

edit: ie what is the conversion with everything sped up as it is in game.

 

edit2   :actually using the torpedoes as a gauge if they're going 67 and take 38s to go 7km 30/67=.4477 so .4477 of 7 = 3.13 so in theory yes they could hit

 

edit3: except what'll happen instead in that time is the Kongo capt's cat will walk across the keyboard hitting wasd and all the torpedoes will miss. 

[Compassghost]

Maybe.  It is closing so the torpedoes don't actually have to go 10km.  I don't know how far in game a ship can go in ~40s though.

 

Everything you need to solve the riddle is provided in the riddle

[Flagship_Amagi]

 

Hint: The battleship is moving towards you at 30 knots. If it were parked at 10km, of course not

 

ja. >.<

 

anyway then we have to take into account wether or not the kongo would be able to avoid the torps.....how far apart were they spaced?

[Dah_Bears268]

If those torpedoes didn't hit the Kongo, why would you make this thread to begin with?

 

[sherman255]

I'm a BB driver so my answer is Bacon, and more Bacon.

 

[Compassghost]

 

ja. >.<

 

anyway then we have to take into account wether or not the kongo would be able to avoid the torps.....how far apart were they spaced?

 

Assume that one torpedo is perfectly lined up at the Kongo as described, and the Kongo driver is reading the forums. I hope I don't have to work this out and nullify the riddle :<

[Flagship_Amagi]

 

Assume that one torpedo is perfectly lined up at the Kongo as described, and the Kongo driver is reading the forums. I hope I don't have to work this out and nullify the riddle :<

 

it hit....

 

 

[Madman7]

If I was in my Mine, I would not shoot at 10km..  with my concealment range of 5.9km.. I would close in to about 6.8-7.5 and shoot there.... better chance on hitting.

[rboy0]

If my math is right then it will intercept the Kongo after traveling ~6.94 km from the point it was launched.... which is a hit.

[ravenouscorvidae]

68 knots = ~35m/s, right?

so 7000/35 is how many seconds the torpedo is in the water, 200 seconds.

 

30 knots = ~15.5m/s

The Kongo is moving 15.5m/s for 200 seconds before the torpedoes die, about 3.1km.

 

That means that unless the Minekaze isn't angled at all and everything is under ideal conditions, maybe one torpedo will hit directly on the nose, making your position obvious. Torpedo spread at 7km range is not so great. If the Kongo turns in the worst way before impact, it MIGHT take 2.

 

Under realistic conditions, the Kongo has ~6 seconds before impact to tab back and maneuver slightly to thread the torpedoes which isn't difficult at that angle. While you usually make good points, this isn't a great illustration of anything. The better tactic would be to wait a while longer and get a shot straight into his side.

[Compassghost]

68 knots = ~35m/s, right?

so 7000/35 is how many seconds the torpedo is in the water, 200 seconds.

 

30 knots = ~15.5m/s

The Kongo is moving 15.5m/s for 200 before the torpedoes die, about 3.1km.

 

That means that unless the Minekaze isn't angled at all and everything is under ideal conditions, maybe one torpedo will hit directly on the nose. Torpedo spread at 7km range is not so great. If the Kongo turns in the worst way before impact, it MIGHT take 2.

 

Yeah, but I've accounted for the Kongo driver being here reading the forums . All things being equal, in this situation, if you aim one of the torpedoes so that it will hit the Kongo, you will hit it if it doesn't evade at all.

[ravenouscorvidae]

 

Yeah, but I've accounted for the Kongo driver being here reading the forums . All things being equal, in this situation, if you aim one of the torpedoes so that it will hit the Kongo, you will hit it if it doesn't evade at all.

 

So what's the point of this "riddle?"

[csp0811]

Consider the point at which the torpedoes were launched to be the origin, with xy coordinates of (0,0) with units of km. Kongo is at (0,10) sailing toward the origin at  0.0154333333 km/second (1.453x10^-2 km/s). A torpedo is traveling from (0,0) due east at 0.0349822222 km/s (3.498x10^-2 km/s). Now we could solve this using kinematic equations, but a simpler way to solve it is to calculate the time it takes for the torpedo to travel 7km and see if the Kongo can reach (0,7) within that time. The torpedo takes 200.1 second to get there. The Kongo can can travel 3km in 194.4 seconds. So assuming a torpedo going in a straight line parallel to the course of the Kongo at 68 knots is launched towards a Kongo that is heading towards the torpedo at 30 knots and does not change velocity (vector of course and speed for ships), the torpedo will strike the bow of the Kongo. Using kinematic equations we can calculate the exact coordinates of impact and time t to impact at varying velocity.

[CasualCat2001]

 

So what's the point of this "riddle?"

 

Probably that Minekaze capts can still hit things at 10km post torpedo change under certain circumstances.

[sushimaster]

1. I would still launch my torp as close as possible before being detected (6,5-7 km) since he might zig zaging to fight the wyoming thus making my torp miss if launch from 10 kms.

 

2. Since he's sailing straight at me, i will turn and keep my nose at him, going straight at him for a 1,5 kms torp drop, gun on hold even when detected in case he tunnel vision and i dont want to alert him. This methode can be extremely costly hp wise.

 

3. Pop smoke, sit in it and wait for him to get near, throttle up and 1.5-2 kms torp drop him.

 

I will chose my option depend on my ship's hp, surrounding and if any enemy cruiser is near by. The kongo is a very dangerous ship but i will engage it, hell, i torp run a Yamato in my farragut before, his secondaries wreck my before i get in 3kms.

[Compassghost]

 

So what's the point of this "riddle?"

 

To... be a riddle? I mean, it's not like you can't do this in-game with more complicated numbers.

[PPH402]

Barring the above mentioned cat, it would hit. I can't tell you how many times I've been saved by my cats walking on my keyboard. 

 

[Final_Spark]

The fun part is that scale isn't exactly represented well in game. Real world math helps, but doesn't get to the in game result.

 

Still, the distance marker is for the middle of the ship. You still have somewhere around 0.1-0.2km from bow to amidships, so you've got that going for you. A hit is possible, not that you really want to be in this situation in the first place.

 

I equate this to that crazy friend you have in math problems trying to fit as many pineapples as he can into his car or other such shenanigans.

[DemonsofRazgriz]

Did you hit the Kongo? yes. Why? he is sailing straight and tunnel visioning on the Wyoming.

 

I would personally fire 1 set of torps directly at him at around 7km then a set left of him attempting to gauge if he decides to turn early and one right with the same intention in mind

[Grizley]

Yes you do, and you don't even need much math to figure it out. 

 

Kongo goes 30kts, torps go 68.  If we're rounding we can say the Kongo is half the speed of the torps.  In the time the torps go 7km the Kongo goes 3.5.  

 

In reality the torps are 2.26x the speed of the Kongo so the Kongo goes 3.1km while the torps go 7.  Still 10.1 > 10 so yes, they hit.

 

 

[WhimsicalPacifist]

You are driving in a Minekaze, minding your own business, when, off to your starboard side, heading in your direction, you spot a battleship!

 

The battleship, a Kongo, appears to be traveling at full speed making directly towards you, oblivious to the fact that you are there! It looks to be making about 30 knots and seems intent on fighting your Wyoming 20km to your port side, and nothing else.

 

You line up for a fair spread to account for the Kongo possibly turning , as well as not changing course at all, and immediately fire your tubes when the Kongo's range reads 10.0km.

 

You realize to late you do not have the 10km torpedo tubes equipped. You actually the 7km/68 knot torpedo tubes instead.

 

Assuming the Kongo is too busy reading these forums to change course to avoid your torpedoes, do you hit the Kongo?

 

The bolded part is important.  I appreciate the math because I do try to do something similar before launching, but the bold makes the equations irrelevant.

 

You do not hit the Kongo.  At 7km your torpedoes spread out enough for the Kongo to sail between the torpedoes even though he is afk.  At 6.5k the torpedoes spread out enough for them to miss.

[ravenouscorvidae]

 

Assume that one torpedo is perfectly lined up at the Kongo as described, and the Kongo driver is reading the forums. I hope I don't have to work this out and nullify the riddle :<

 

 

The bolded part is important.  I appreciate the math because I do try to do something similar before launching, but the bold makes the equations irrelevant.

 

You do not hit the Kongo.  At 7km your torpedoes spread out enough for the Kongo to sail between the torpedoes even though he is afk.

 

He already over-idealized this variable.