How to Design the Perfect Trebuchet
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- Опубліковано 1 лип 2024
- Thanks to Pepperonin for supporting us on Patreon and making this video possible! Support us here: bit.ly/2qBHcvf
Looking to lay siege to your neighbor's house? In this video, we'll teach you the basic design principles behind trebuchet construction.
(This video is purely for educational purposes, please do not lay siege to anything)
Siano's Paper on Trebuchet Mechanics: www.algobeautytreb.com/trebmat...
The trebuchet is one of the most famous siege engines of all time, and designing and optimizing the powerful machine involves some tedious work.
To understand how to optimize the design of a trebuchet, first we need to understand exactly what designs and principles make up one. A trebuchet in its most pure form involves a counterweight that falls completely along the vertical axis and a swing arm. Attached to the end of the swing arm is typically something like a sling to increase rotational velocity, but it isn’t essential to trebuchet design. Potential energy is stored in the lever mechanism as the large counterweight is lifted. Once dropped, the potential energy stored in the counterweight is transformed through linear motion into rotational kinetic energy for the projectile.
It’s important to note that no compound motion or mechanism is involved in the trebuchet, rather it is one simple lever arm along with a counterweight. Once the mechanism is understood, the variables to controlling flight begin to appear. Being such a simple design, the only things you can vary are the lever arm length, the height, the counterweight weight, and where to position the fulcrum along the lever arm. While the constraints may seem limiting, optimizing all of these factors can produce a highly efficient machine.
All images and videos courtesy of the creative commons or used in accordance with fair use laws.
Trebuchet animation courtesy of Handrox-G via VideoHive. Copyright information available upon request.
Brittle Rille - Reunited by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Source: incompetech.com/music/royalty-...
Artist: incompetech.com/
This is much more informative than our video... Less breaking things, but much more informative.
Nice video! You guys deserve more subscriptions. Keep it up.
you are a idiot...this vid is horridly bad.
@@autopartsmonkey7992 lol
@@autopartsmonkey7992 shut up
This is the least informative video on trebuchet tuning I have ever seen. Yours must be dreadful.
I feel like it's really a lost opportunity whenever you explain an element of the trebuchet but didn't actually show it on the screen, instead playing the default trebuchet shooting animation. For example: When talking about the arm length, you can lengthen or shorten the arm of the trebuchet, let it shoots, and see how the shot would be different with the change.
You are so right. I’m shocked at all the meat riding in the comments - even though I understand the elements he’s talking about quite well after this poor presentation I felt like I knew less than when I started. He makes no effort to explain anything - it reads like the worlds most useless Wikipedia article.
0:06 "Stop looking at our plans, woman. You don't even get a hard hat."
At 1:12 minute-mark you say that there are only four things you can vary: "Lever arm length, height, counterweight weight, and fulcrum position." You are missing half! You can vary the counterweight height, the sling length, and the angle of the pin on the tip of the throwing arm, as well as the CG of the arm. The counterweight height is how far it hangs from the counterweight axle on the arm. A counterweight height of zero would imply a fixed counterweight. Ideally, you want the counterweight to hang as far down as possible without hitting the ground, but in the case of trebuchets like the one at Warwick the box has to clear the winding axle for the treadwheels. You can also vary the CG of the throwing arm by tapering it or adding "counterpoise" weight. Some medieval drawings feature an added ring of weight on the butt end of the throwing arm (in addition to the counterweight box), which was probably meant to bring the CG of the arm closer to the main axle even before the box was attached.
Both sling variables (length and pin) are dependent on your choice of counterweights arm length, and projectile size. My point was to state the unconstrained variables you could optimize the design. Sling variables are highly dependent in the design process. Counterweight height is a variable I mentioned as well as usually being dependent on lever arm length and height in traditional trebuchet designs. The CG of arm is also a dependent variable on the variables I mentioned 🙂
My experience with the "rings", "heavy short arm" is that that mass slows the arm down. It's just more mass that has to be accelerated. I think the lighter the upper hanger arm and short arm are, the faster the throwing arm will be.
Bloody brilliant. Just the info I was looking for. An easy subscribe.
Glad to have you on board! ✌🏻🙂
Thanks, Great help for an upcoming project
You uploaded the exact video i was looking for! You see I juste entered a contest of catapults. I thougt of trebuchets but i didnt know how to start building it until you. Thanks good cuality video
So did I get this right? The ideal payload to counter weight length is 3.75:1, 4:1, or 5:1 and the ideal projectile mass to counterweight mass is either 1:75, 1:100, or 1:133. If so I need a bit more of a clear answer from this.
Every machine is different, and those numbers mean nothing. Too many factors to say "this is the best way", or "this is optimal". These machines are purpose designed and the only thing that matters is can they forcefully hit the target repeatedly and not fall apart, from a range that the crew would not be killed by arrows. Now with Sport Catapulting and Punkin Chunkin the machines are still purpose built, and everyone is unique. No formula or equation can tell you the best way to build any of them.
3.75:1 beam ratio x PSSSHHSHHS' rule of 20 means that CW to projectile is 75:1. Just seconds prior, you say the mass ratio should be 133:1. These rules are not in agreement. So, which one is it?
@@MTEXX I think he just meant that 133:1 is the widely known or used rule jsut like the 4:1 or 5:1 lever arm ratios are the most commonly used. But the math says it isn't the best
Exactly what I was looking for, great video
Glad I could help!
Look up Texas Trebuchet on facebook.
putting the swinging fulcrum on wheels allows for a more direct vertical drop and increases force and velocity of projectile
That is the modern floating arm trebuchet
Thank you for this very good cideo!
The superior siege weapon
Awesome vid
Thank you!
"you can read" 😂 sass levels are high!
good video
hope you keep update :)
Lol I love that part “it’s called pssssssss. Well you can read.”
3:03 #4 the Trebuchet MUST have wheels.
Why? That would decrease the release velocity. Ideally you'd want a secure base, else there will be energy wastage.
@@lordbalzamore7692 Two main reasons: 1) when it's on wheels, the trebuchet will roll back and forth such that the counterweight can fall straight down, which is more efficient since else a small part of the weight gets transferred to the throwing arm (also see ua-cam.com/video/KpFTyE-wiNo/v-deo.html) and 2) it reduces stress on various parts during the throw and doesn't kae it want to tilt over.
@@lordbalzamore7692 So that they can run you over.
Can I please have the counterweight be perfectly motionless after the shot thus converting all its potential energy into the kinetic energy of the projectile? Or am I asking too much
All you need is one day in the field, equations, not so much...
A video on Tuesday?!
We had a lot of content scheduled and decided to push an extra one out this week 🙂✌🏻
Do the 1-3. 75 ratio what should be the weight
2:32 Donald B Siano is educated and ignorant. Everyone who knows anything at all about trebuchets knows that they need to have wheels!!! The wheels make it so all the kinetic energy of the counterweight can be used to move the projectile. If there are no wheels the extra kinetic energy will be absorbed by the trebuchet.
Ksp background and a Brazilian meme 😍
Depending on how long this quarantine lasts, I may just have to build a trebuchet and lob a fireball at my neighbors house on Wednesday May 6th at 5:32 AM EST..
Nice
What is the optimal angle of alpha? Total noob here really trying to optimise the distance using parabolic arch. 30 degrees seems to be the standard but I’m getting wild variations.
A bit late but the optimal angle is 45 degrees, that way u can get the maximun distance
nice
Thanks!
Amazing….PARENTING! (Oh, and the trebuchet c’est très cool aussi!)
I have aquestion:
How to take into account the elevation, let say that you shoot your trebuchet from an elevated site, how to calculate everything, is there some magic online to do that fast and easy?
Tuesday?!?!? I wasn't expecting this...
😉 we had a ton of content ready to go and decided to push another out this week✌🏻
Concerning Reality
Thank you lol
Concerning Reality fymhtutukw
0:05 Safety lapse. The worker on the right is not wearing a helmet while working in a construction site with potential falling object hazards!
OK, Siano later came out and said that he made some invalid assumptions. Pfsshthpok's Rule is a guide based on observations of a number of trebuchets and breaks down at extremes of mass ratio or leverage ratio. Da Vinci came out with better numbers involving square roots.
You could build a treb based on the info in this video and it would doubtless work well, but it wouldn't be "perfect".
the only reason im watching this is bc my teacher is forcing me to do this project that im like 3 weeks behind on.....and we only have 4 weeks....-_-
just typing this reminds me how screwed i actually am...
Lol let me know if you need any help! ✌🏻 also we make more fun videos too😉
4:29 is amazing 😂🤣
Lady in the second slide had no helmet on... OSHA!!!
2:36 so 2001 or 2013?
Add wheels and throw distance increases by nearly a third. Test it on any trebuchet.
No, not on a hinged counterweight trebuchet. On a Fixed Counterweight Trebuchet, yes.
Not on a MURLIN.
Not on a FAT or an F2K.
I’m gonna build one in the back of my truck
Respect from KC sportsbike society
You know I'm impressed with the fact that you have a degree(s) in engineering and you can throw around all the big equations and all, but do you really think the folks, back when these were designed, used the same method, I think not. I think, if you can even do it, that you go back to basics and design one, as our ancestors had, and build one.
I have. These equations just give meaning to random guessing and checking when they were originally built. They’re the mathematical representation of all the work that was done in previous eras. As is all science and engineering.
Subbed...
Welcome! New videos every Monday! 😉✌🏻
when I clicked on the vid, I was thinking perfectly aiming trebuchet.
alright kerbal we get it
Colin Furze are the best
He is the best.
Стену метровой толщины из гранитного камня мне кажется с такого даже не поцарапать
I like the fact we are destroying our neighbors :D
SEIGE!
Directions unclear, shot a tennis ball into the solar system
Trebuchets are better than catapults
A Trebuchet Is a catapult!
@@FingerAngle cease your heresy
@@dinonuggets7148 lol No! Fling at me, bro! All Throwing Machines Are Catapults! A Trebuchet is a gravity powered catapult. An Onager is a Torsion powered single armed catapult. A Ballista is a twin engine twin arm torsion powered catapult. A sling shot is a catapult. You have to be specific.
@@dinonuggets7148 and by Better, what exactly do you mean, range, accuracy, rate of fire, payload, mobility, ease to build, operate?
Do you even hurl, bro? Maybe you should ask somebody...
there are two lever arms, you forgot about the sling
my head is hurting! i just wanted to build a catapult for fun
😂 trial and error will work too
Bold of you to assume I can read...
bs, i will call your bluff with rotary cannon
Have you watched video's from the Shadiversity UA-cam channel? There is amazing content about medieval weapons and architecture! You must watch the video about whether the castles and fortresses in the LOTR trilogy are historically accurate.
In my opinion video's that are educational and entertaining at the same time makes a UA-cam Channel achieve cult status. So channels like Wendover Productions, Real Life Lore, Shadiversity, Geography Now and so on.
Keep creating this amazing content as achieving this cult status is definitely possible for your channel even though difficult and takes a lot of research. But it will gain you MUCH more respect than people like Logan Paul who just simply make video's of themselves fooling around acting like idiots ( videos that do not take much thought/planning or effort).
Also do not feel pressured to get a video released every Monday, it is OK to be delayed a couple of days because the content of your channel is top quality and I think your viewership will understand the effort and time required for even short videos like yours. So they will understand it. Even Real Life Lore have been delayed by a day and Wendover Productions have reduced their output from a video every 2 weeks to a video every 3 weeks!
By the way these are the list of UA-cam channels that I think have attained cult status, your channel is on its way to join this list!
Wendover Productions
Real Life Lore
Dan Lok
Valuetainment
Joe Scott
Vsauce
Tom Scott
Financial Education
Half as Interesting
Visual Politik
Shadiversity
Metatron
Skalligrim
Lindybiege
Alternate History Hub
How to Make Everything
Simple History
The Inforgraphics Show
Valuetainment
Brain4 breakfast
Zephereus
Geography Now
Braincraft 👍👍
Thank you! 🙂
Kerbal space program
Any Monash engineering students here?
Is Monash as bad as the rumours? Apparently it’s just foreigners now, zero Australians. My uni has gotten bad, 50%+ of their holdings were in China and they conceded they are just a people smuggling organisation in an internal memo back in 2005.
Am here because of PewDiePie
But how?
Random Channel you found how
Me: *builds this* I want to destroy school
Friend: lol what is the ammo? Some rock hahaha
Me: I got a better idea
Friend: Wot is it?
Me: 10 kg of gunpowder in a burned wooden ball that was followed by throwing water ballon that was filled with gasoline
That was not a trebuchet. Trebuchets have wheels on the bottom so they can move which allows the counterweight to fall in a straight line.
This was a trebuchet....
@Warrior Son you wouldn't be able to point to any historical data which supports your claim, would you?..
I hate my damn school, osher ik you saw this.
inaccurate information.the length of the sling is extremely important to a counterweight treb.do your homework next time bruh.
You did a shockingly poor job explaining this, you made no effort to show rather than tell, telling us the equation that governs it is one thing, showing what you mean is an entirely different thing. You are a very poor presenter. I feel bad for kids watching this or people who couldn’t follow along they’d be left utterly frustrated. Don’t do that to people, it doesn’t have to be over explainy and pandering but it doesn’t need to be whatever this is, this was terrible even for someone who knows what you’re talking about.
aw, you're too kind!