To Aru Kagaku no Railgun 21
Those are bigass fireworks. How do I know? Glad you asked.
Assuming the constellation on the right side is a badly drawn Ursa Major, we can figure out the radial size of the firework by using the radial distance between Merak and Dubhe, which is generally accepted to be 5°.
Using the blue firework at the top as reference, we can see it is approximately 3x the radial distance = 15° in radius.
It appears at 00:12.763, and the sound is heard at 00:14.515, giving us a 1.752 second interval between explosion and when it reaches our ears. (Speed of light is negligible in this case.)
The speed of sound in 25°C summer air at 80% humidity is 347.65m/s, giving us ~609m distance to the firework's center.
Simple trigonometry tells us that its radius is then tan(15°)*609m = ~163m
This means the firework is about 1070 feet wide, or 3 times the length of a football field.
Addendum courtesy of Bored:
At 50 feet per shell inch, this means that this firework had a 21.4" shell. By comparison, the largest naval guns ever mounted were the 18" guns used on Yamato class battleships.
Here, verify it yourself. And it's a bit harder but you can still see the stars in the XviD too.
Oh, and the timer position has been filled. Thanks to all that inquired about it.
On a different note, did you know?
Comments (80)
Thank you mazui~
thanks for the subss
@Ulrezaj
You're a nerd. And I say that most lovingly. :)
You are correct, sir!
Why are you not making heaps of money and marrying Japanese chicks?
Btw, thanks for the fast release as always ^_^
Forgot to mention, my Friday is now complete :D
Just curious, what is that anime in the new "MAZUI" banner that has been put up atop of this site (The names of those two characters as well, if possible) if anyone knows?
http://i109.photobucket.com/albums/n59/TurboGTX/shelldimensions.jpg
also, apparently anything above 12" is uncommon even for large shows.
tl;dr: big-ass indeed.
Have you made any decision on which shows you'll be subbing next season?
Haruhi, Spice and Wolf, Railgun, Katanagatari, and now(Well it seems like it) Angel Beats?
You guys sub like the best animes ever!
i assumed that the anime series may be taking place in the future, maybe near or up to 60 years in advance from present day.
it is likely that given the legal situation and safety concerns of said future, it is likely that that 21 1/2" fireworks could be used, devised and implemented, but however unlikely that any shell of that would be used in regards to safety issues because:
said shell with dimensions of 21.4"d by ~20"z, typical.
v = 3.14(11.2"^2)20"
v ~ 210.168"^3
given 1^3" gunpowder ~ .55oz
210.168(.55) = 115.5924oz of stored gunpowder
the amount of gunpowder used in a 105mm shell casing was roughly 20 kg of gunpowder.
20kg = 705.4792389916082oz
115.5924oz = 3.27698941687425 kg
the 105mm shell had an explosion velocity of roughly 1100 foot pounds per second
55 foot pounds per kilogram of gunpowder
3.27698941687425(55) = 180.23441792808375 foot pounds per second.
1 foot pound = 1.3558179483314 newtons
1.3558179483314(180.23441792808375) =
244.36505873395860759851195475 newtons
why is all this relevant?
a 10 gram bullet to the head at 3.5 newtons is all it takes to kill a person
my point is this: based on the amount of gunpowder inside the charge, considering its potential energy and and the force it inficts within the amount of foot pounds per second equals the same force and energy someone would receive if they were shot 70 times by 10 gram bullets.
or if you wrapped 7 pipe bombs together and threw them down the street and lit them off.
this is the amount of energy we are talking here. there is NO WAY anyone would ever allow such a dangerous BOMB into city limits.
sorry if any of this is going to be easily referenced. I got it mostly from a devil's cookbook.
Laughed hard when I read the text + nadeko pic :x
Bizounours says thanks.
http://tinyurl.com/ydd4mcc
Huh... Nakedo... NEKEDO-CHAAAAN!!!~ :)
2 thumb up...
GeRo~ GeRo~ (^_^)~
Correction~ N.A.D.E.K.O C.H.A.N~
Kawaiii~
GRRR IT'S REALLY IRRITATING!!!!
my point was merely to single out the destructive qualities of the firework. all the energy is based on how much gunpwder they would use.
traditionally, fireworks use gunpowder, so i assumed thats what they used. also, just because its a city full of espers doesnt meant they wouldnt consider the amount of explosives they were working with to be considered something dangerous.
i would assume again they would try to prevent property damage, including physical harm, so a charge of that size would have roughly half the same power as what Nojay's reference was, so the city would have to cordon off and reinforce every building, window and anything not tied down within a 32 square block area.
so much work for one firework!
regardless if they did or didnt factor in the destructiveness of the fireworks, the charge size of the one on topic is equal to a small bomb
Even though I haven't watch this episode, but I'm pretty sure that Misaka knows how she looked like because she peeked at Professer's memory which loliritsu was in the memory too. Re-watch episode 11.
Thanks for the sub.
unfortunately, we can only work with typical numbers here. its very true we cant assume to know what kind of gunpowder they used, how much and how compacted but the numbers do dictate the maximum amount you can physically coalesce inside the volume of the shell. but i digress...the numbers, on my part, are only based on assumptions for typical fireworks, scaled up obviously.
T_T
By the way, I never knew most of anime lovers are good in science/math, we could make a lab right now with a huge anime banner right now!
btw, angel's beat! omg! omg!~ finally!!~~
Really appreciate all the hard work, keep it up :-)
21.4" fireworks? Academy City is reallu pulling all the stops.
this is not the place to be racist, im asian too n i hate u ;O
as long ur ON EARTH, bear with it :(
Thank you, Mazui.
IT'S ON! D:
Yes, and that's the reason why I keep coming back to this group. The do great shows and avis too...like you said; What more can we want?^^
Thanks for being this great Mazui, we appreciate you a lot.
http://relweb.clearfrost.net/torrents/%5BMazui%5D_To_Aru_Kagaku_no_Railgun_-_22_%5BXviD%5D%5BE64B8631%5D.avi.torrent
They were deployed on the General Wolfe and Lord Clive towards the end of WW1. 85 rounds were fired in anger.
8D