Hello everyone, My name is Chae Yeon-seok
Today, I’m going to tell you about ShinGiJeon
you know what ShinGiJeon is?
Ah, good. It’s very good because it doesn't seem that many of you know about it
If everyone knows well, then I have to go down again
Well, ShinGiJeon comes…(laugh)
ShinGiJeon comes in four sizes as you can see
The one at the bottom is the smallest, so this is called So-ShinGiJeon(Small-ShinGiJeon)
So-ShinGiJeon is 1.15 meters long and it has a black powder paper motor case at the top
It is about 15cm long and 2cm diameter and
when fill it with black powder and fire it, flame spurts from the back
Then this rocket flies as a reaction to the spurting flame
It can fly about 100m as
Have you ever seen So-ShinGiJeon flies? Let me show you the video.
(Video)
The rocket’s characteristic is flying fast
If you think something else during its fly, you can never see it
Jung-ShinGiJeon(Medium-ShinGiJeon) is a little bigger than So-ShinGiJeon
Jung-ShinGiJeon is 140cm long
and has a paper motor case at the top which is bigger than that of So-ShinGiJeon
. It can be filled with about 45g of black powder which is twice as much as the So-ShinGiJeon holds
Also the difference between Jung-ShinGiJeon and So-ShinGiJeon is
that Jung-ShinGiJeon has So-Balhwatong installed on the top of its paper motor case,
which is a small paper bomb
So Jung-ShinGiJeon is the rocket whose bomb at the top is designed
to explode when it approaches its target
It can fly about... It can fly about 200 m
Actually, it is very surprising that our ancestors designed and made them during the reign of Sejong the Great
So everyone, take a time machine to go back to 563 years ago
and watch So-Balhwa explodes while Jung-ShinGiJeon is flying
(Videon)
Yes, it is flying
You saw something was exploding? It is not that tremendous because the bomb is small
It exploded again
It is amazing that our ancestors invented this kind of rockets a long time ago
The biggest among ShinGiJeons is Dae-ShinGiJeon(Large-ShinGiJeon)
How large is it? It is very large
It is so large that I couldn’t bring it.The arrow is 5.3m long
So, But I couldn’t come empty-handed so I brought this powder motor case
The powder motor case is this big
You can see it’s very big. It can hold 3kg of black powder
So this is about 67 times, 70 times more than what the Jing-ShinGiJeon holds
Dae-ShinGiJeon also has Dae-ShinGiJeon Balhwatong which is a large
which is a large sized explosive paper bomb and is 100 times larger than So-Balhwatong
that used with Jung-ShinGiJeon. It is made to fly a long 500 m and explode
You might want to see the video, so I prepared too
(Video)
It’s very cool, isn’t it?
Yeah, the rocket’s fell to the reeds and the fire are burning
And also the bomb’s exploded like that
But maybe the scientists during the reign of Sejong the Great thought that was not enough
So they invented Sanhwa-ShinGiJeon, which is the improvement version of Dae-ShinGiJeon
SanHwa-ShinGiJeon is similar with Dae-ShinGiJeon
that installs three small rockets called JiHwa-tong at the top
JiHwa-tong also has a small bomb called So-Balhwa
So when Dae-ShinGiJeon is about to approach its target, this JiHwa,
the two-staged rocket, fires and three rockets separated out and they explodes
This is the ultimate weapon that our ancestors have made
Do you want to see it?
Ok. It was in experimental stage so we fired it with only one JiHwa
Don’t miss the separating of JiHwa
(Video) That’s SanHwa-ShinGiJeon
Now it is launched and flying. Yeah, now second stage’s just separated
It almost hit the car. It wasn’t on purpose
That was a close call. The place we’ve experimented was proving ground for cars
and they were still developing a new car. I almost destroyed them by Sanhwa-ShinGiJeon
SanHwa-ShinGiJeon could fire the rocket only one by one
Do you know who is the next king of Sejong?
Yes, as you know it is King Moonjong
When Moonjong was a prince,
actually he was also a director of developing rocket weapons
So he invented Hwacha himself after being king.
Hwacha is not a fire car
It was a fire cart and it lauched 100 So-ShinGiJeons and Jung-ShinGijeons at a time
This weapon was already developed in 1451, during the reign of King Moonjong
This also was fired at night for better visual effect
Let me show you the video
(Video)
100 of rockets fired while Jung-ShinGiJeon was flying, isn’t it amazing?
Do usually just say yes when things are amazing?
Well, thank you
Actually it deserves applause
because it is incredible that our ancestors developed those weapons 560 years ago
I think our potential to be a developed country
came from this great talent that we inherited from our ancestors
I’ve showed you my study results about ShinGiJeon
I started the study on ShinGiJeon by chance
When I was a high school freshman, I really liked playing tricks
Do you know what is the most dangerous and dynamic trick to do? It’s playing with fire
Many of you might have done it, I guess
The playing I liked with fire was firing a rocket and launching it
One of my tympanums was ruptured during the rocket launching experiment
when I was a freshman
I thought I need learn more so I started study
When I was studying the history about Choi Mu-seon who wrote Hwatongdogam
-the book from late Goryeo dynasty- and developed weapons,
I thought maybe he had made rocket weapons too
So I decided to study on that and started study
right after I entered the university. I presented the paper after 4 years study
Isn’t that title nice? ‘Scientist in 20’s presenting his 4 years study.’
That’s me in younger days
I presented the study at the conference of Society of History
to introduce we had a great rocket weapon
I also presented at IAF(International Astronautical Federation)
to introduce that we have great rockets to the world
Since I liked firework, I couldn’t help making the rocket by myself
I was looking for the opportunity and at that time,
1993 Expo was held in Daejeon
So I suggested restoring and firing ShinGiJeon
And we did a firing test in Gap-river
(Video)Please celebrate with applauding
It is amazing, isn’t it?
You don’t have to applaud again. Anyway, thank you
The reason why I could restore ShinGiJeon perfectly same as the old one is
not that I am genius
our ancestors left the detailed record describing the plans of ShinGiJeon.
Here is one of pages of the record
You can see that it explains the exact length of the rocket,
and everything is explained in detail more than any other record
We learned measuring units like Chuk,Chon,Pun in school
and the record uses “Li” which is the smallest unit
You might not have seen the letter. Well you don’t need to know
This is Li and it is 0.3mm .
. It is as thick as about nails and our ancestors already used this small unit to make plans
After making plans, all the regions of the country copied them
So they recorded everything precisely to prevent errors
For example, the record contains lengths of the extrados, bore and thickness
They are explained in a very modern way
Also, what is important is charging powders well into the rocket
and the record explains this precisely.
So I could restore them
Let me show you the video of restoring process
(Video)
It is not in forge. They are charge powders. Assemling two-staged rocket
To sum up what I’ve been studying,
ShinGiJeon is the world oldest rocket which we can find the exact structure
and it’s the oldest rocket whose record explains everything in detail
such as the way of charging powders
Dea-ShinGiJeon is the world biggest rocket with the paper engine
Sanwha-ShinGiJeon is the world first two-staged rocket
Hwacha is the world oldest mobile multiple rocket launcher
Such a great ShinGiJeon is the most precious science heritage of Korea
and it is precious science heritage of the world either
if I have a chance in the future, I’d like to hold ShinGiJeon festival
and show the flight of ShinGiJeonz to the world and share our precious heritage
Everyone, have you ever imagined the feeling of flying over on Dae-ShinGiJeon
Hope you enjoy it
(Video) Wish the flight success!
Dae-ShinGiJeon with camera is flying
It fell down on the ground and that is the image from the camera
You can see the launching site.
Thank you
TEDx Daeejeon