SINZA - Exotic Automatic -Exotic Weapon Design & Construction

Discussion & Design of Mechanics for Automatic Bladed Weapons & Exotic Gear
 
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 Ze Trebuchet

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DeathWish
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PostSubject: Ze Trebuchet   May 15th 2011, 6:04 pm

Hey people! A while ago, i made a Trebuchet with a whole lot of information to back it up scientifically speaking, sadly, I lost said Info, but I still have the Awesomeness, I will try and explain each image.


well, this is a full view not much explaining to do here


This here is a leather pouch to hold a projectile (I use common marbles, and they work GREAT)

The ideal counterweight-projectile weight ratio is 133:1 that is, if you have a marble weighing 1 gram, your ideal counterweight should weigh 133 grams.
I know there is a definite formula to take full advantage of the sling, but I never did look into that, I just made it by trial and error.



This here is VERY important, this little bent wire holds the sling up to the point were it reaches the best angle to shoot farther, by bending it, you can change the distance it shoots the marble. If you shoot it as far as it will go, you will loose a bit of power. But if you shoot it about 75% max distance you get AMAZING power (I made a hole in a cardboard box about 4 meters away)



This is what I used as a counterweight, it is a part of a veeery old air pressure release valve. It weight about 600 grams give or take 50.


Very simple trigger design, its just two bent wires forming a loop with a screwdriver as a fastener (don't use a screwdriver, I lost my little wire that I made for it)


this piece is to demonstrate that it could be cocked by human power. The method is somehow like this starting from an un-cocked position like in the first image: pull the long arm wit a rope about half way, place the end of the sling with the little ring in the bent wire at the top of the arm, connect the two triggers wind it up, load projectile, shoot.



close up of the sling trigger.


overall view.

The tree holes in the arm are to change the length ratio (3:1, 33:7, 7:1)
The size of the supporting things at the side don't matter (just make it tall enough so that the counterweight has enough room to swing), the only measurement you need is the size of the long arm with the correct ratio, in my tests ratio 3:1 proved to be the best. The wheels may seem like a cosmetic feature, but the actually help the trebuchet throw the projectile farther, so if your building one, try adding wheels.

I will gladly answer any questions you have.

Don't ask me for videos though, I have a very bad internet connection (satelite) if I even try to upload a video, the connection will be terminated for a whole day ¬¬
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Irianthul
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PostSubject: Re: Ze Trebuchet   May 15th 2011, 7:33 pm

Looks nice! It looks like it could use some more finishing up, For instance, when you look at the wheels, and how they are secured. It's just folded over. It does the trick, but if you want to make it even better looking, I'd go for that. Maybe you could paint the wood, as well?

Too bad you can't do a video though, I would have loved to see that thing in action. But nice build anyway!

Irianthul.
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PostSubject: Re: Ze Trebuchet   May 15th 2011, 7:46 pm

yes, I agree it could be a bit more refined, it came out that way because I rushed the process (took me about a day and a half)

But, the wheels were made like that purposely, its the simplest way I could come up with at the time, and still give it the realistic look, you know?

what I would change is the long arm, make it round, for instance. The string look very cheap too, but they hold, and the winding mechanism, the whole thing is very weak, so change all that.


I won\'t re make it because I am quite satisfied with this build, but later on, maybe next week, I will post up my other siege weapon, which may seem more boring, but is in fact WAY cooler, think 'TORSION' Wink
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cowscankill
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PostSubject: Re: Ze Trebuchet   May 15th 2011, 8:12 pm

Oh that's cool. I just got into wanting to build a ballista, though I don't have any hardwood.
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http://www.instructables.com/member/cowscankill
DeathWish
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PostSubject: Re: Ze Trebuchet   May 15th 2011, 8:24 pm

I'm actually building one, and I am using hardwood (mezquite) but it feels as though you don't need hardwood, really, try building it with softwood, just make sure the gap between the torsions is relatively short.
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Nightshade
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PostSubject: Re: Ze Trebuchet   May 16th 2011, 3:18 pm

I made one of those... 1.5ft tall out of red oak with chain as a counterweight.

It's been sitting in my basement for a long time...

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