Introduction: The Paper Trebuchet

Moving on from my original Paper Catapult, this is an only slightly more complex model.

Rather than using counterweights like the later versions, I decided to use muscle-power and make a traction trebuchet.

Again, it's just a single sheet of A4, but you need two cocktail stick this time.

(I have posted this without a firing video because certain members have been nagging me to get it posted. I will do a video as soon as I can.)

Step 1: The Template

As is my preference, I drew the design by hand, in ink, on 5mm squared paper, referring back to the Paper Catapult for the base and frame. I made a couple of mistakes, but I include a scan of the original drawing for completeness' sake.

More useful for you, dear reader, I have also included a re-drawn PDF and JPEG of the template. Use whichever you desire (the JPEGs are probably the easiest to re-size, should you need to).

Print the template out on either normal 80gsm printer paper, or light (120gsm) card. If you print or photocopy to a size larger than A4, then I recommend using card instead of paper. If you use card but make it smaller, then careful scoring of crease lines will be required.

You will also need two cocktail sticks, gluestick, a paperclip, stickytape, pliers, sewing thread and small weights such as nuts or modelling clay.

Step 2: Preparation.

Whichever version of the template you are using, cut out all the pieces, then use one of your cocktail sticks to pierce the centres of all the small circles.

Crease all the dotted lines. If you are using card, or making a small version, then you will need to score the lines before creasing. Using a ruler, drag the tip of a blade of a knife gently along the line. You are scratching the surface, not cutting.

Step 3: The Base

When you have cut and creased the template, start folding at the long sides - the sides fold up, inwards, down and then towards the centre of the frame. Glue the last part down to the base of the frame.

When you have glued both sides, work on the ends. The first fold up seems to leave two extra bits sticking out at the sides. They're supposed to be there - glue them to the outside of the sides of the base. As you fold it over the top, glue the end down onto the sides of the base.

Two longer flaps glue to the tops of the side beams.

The ends then fold down inside the same way as the long sides. Glue them down, and then set the base aside to dry.

Step 4: Vertical Beams

  • Note that the flaps at one end of the beam do not all get creased.

Glue the long flap and fold the piece into a square-section beam. Make sure the three holes line up (you should have just glued one hole over another).

Pierce holes at the three dots, then glue the outside of three of the flaps at the end with the dots. Fold the three glued flaps on top of each other, then cover the third glued flap with the fourth, dry flap.

At the other (lower) end of the beam, glue one of the creased flaps, fold it down, and fold the opposite flap on top of it.

You should now have a beam with two flaps sticking out at one end, with holes in the flaps.

Repeat with the other beam.

Step 5: Diagonal Beams.

When you have cut and creased, glue the long(ish) flap, and fold the piece into a square-section beam. You should have six loose, unglued flaps.

Repeat with the other diagonal beam.

Step 6: The Throwing Arm

The arm of the trebuchet is more complex than the arm of the catapult, as it has been modified to increase the leverage of the string's pull.

Cut out the long section, pierce the holes and crease the lines.

Glue one of the long sections, and fold it into a long beam.

Glue the small tabs at the square end, and fold them over.

Fold the small tabs over at the wedge-shaped end, then glue the long tab over them.

Crease the pivot-section, then lay the square end into the pivot section, line up the holes and glue it in place.

Glue the long narrow flap, and wrap it around the pivot section, over the back of it and along the beam.

I also added two sections to glue on the side, with the intention of holding the thread in place during firing. They may prove to be unnecessary, but I added them anyway.

Step 7: Construction.

Glue the insides of the flaps of the vertical beams, and place them over the sides of the base, lined up with the holes in the base.

Thread the first cocktail stick through before the glue dries, to make sure the holes are lined up. If you leave it in place, you can glue on the diagonal beams before the glue dries.

Glue the inside of all the flaps of the diagonal beams, and place them bracing the vertical beams against the base.

Place the throwing arm between the vertical beams and thread the second cocktail stick through to hold it in place.

Take a length of sewing thread, double it, and knot the ends together in a nice, fat, ugly knot. Tape that knot against the vertical part of the throwing arm, against the pivot section.

Use the needle to thread the thread through the holes in the end of the base. The thread also needs to go around the lower cocktail stick, but it is easier to pull the stick out, lay the thread in the base and then put the cocktail stick back, trapping the thread below it.

I happened to have a drink-can ring-pull lying nearby when I made this, so I tied it to the end of the thread to give me something to pull and to stop the thread getting pulled back through the hole.

Step 8: Ammunition.

So far, all the trebuchet does is quickly flip its arm. Flashy, but useless.

Unlike the catapult, the ammunition is not fired from a bucket or basket. Instead, it is hung from a sling on the end of the arm.

In large trebuchets, the sling is attached to the arm, and the ammunition is loosed from a pouch in a manner very similar to a staff-sling.

This trebuchet is too small for a complex arrangement like that, so the whole string goes with the ammunition, swinging off a hook or pin on the end of the arm.

To make the pin, straighten a paper-clip and then bend it completely in half. This gives a nice smooth end that will not snag the string.

Bend it again to match the shape of the end of the firing arm, and tape the bent clip to the underside of the firing arm, sticking out about half a centimetre.

To make the ammunition, fix a small weight, such as a small nut or a blob of modelling clay, to a loop of thread tied from a piece of thread about 5-7cm long.

Step 9: Firing

Firing is quite simple - hang the loop over the firing link, lay the arm down and then give the end of the thread a sharp pull.

Be careful, because the ammunition could go in almost any direction until you have practised a little.

If the ammunition comes back towards you, or goes straight up, the the firing link needs to be bent or curved slightly upwards. This is most easily done with a pair of pliers, one holding the firing link still near the arm, the other bending the free end.

With a little adjustment of pin, ammunition, and how hard you pull the firing thread, you should be able to lob your ammunition in a nice high arc, perfect for dropping boulders and rotten horses behind the highest castle wall.

Enjoy, and let me know what improvements you make to your model.

Comments

author
teagoblet22 made it! (author)2015-10-27

works like a charm

author
Kiteman made it! (author)Kiteman2015-10-28

Cool.

author
goingforthewin made it! (author)2013-02-16

cool
paper trebuchet

author
Kiteman made it! (author)Kiteman2013-02-17

Thanks, although, personally, I prefer my original paper catapult.

author
chubawabu made it! (author)2012-04-15

Great instructable as always but needs a video.

author
Yooy16 made it! (author)2012-03-11

Hi ya Im making this for a math class and it needs to fire a certain range. how far does this shoot?

author
Kiteman made it! (author)Kiteman2012-03-12

You know, I'm not really sure (I haven't made this again since posting, because I much prefer my original Paper Catapult) - there's a certain amount of skill involved in releasing the ammunition "just so".

Certainly it hit the wall of my shed (and the ceiling, and the wall behind me...), So I would say plan on around 8-12 feet.

author
Yooy16 made it! (author)Yooy162012-03-12

Thank you very much tht is great news. Almost everyone in my class has used your plans for the paper catapult, so keep up the good work!!

author
Kiteman made it! (author)Kiteman2012-03-12

Cool!

You could all post a report of the results!

author
Partex made it! (author)2010-11-08

I don't understand how to fire ammunition will you please clarify.

author
Kiteman made it! (author)Kiteman2010-11-08

Tie the ammunition onto a loop of thread.
Hang the loop over the paperclip.
Pull the tab, the arm flips and the ammunition flies.

author
ZoroThePirateHunter made it! (author)2010-10-29

hi, its me again! umm kiteman, is there any other medieval weapon you made out of paper???

author
ZoroThePirateHunter made it! (author)2010-10-16

thanks, kiteman! This is a really awesome instructable because it is a real help with my 7th grade castle project!!!! :D XD

author
Kiteman made it! (author)Kiteman2010-10-17

Excellent, I'm glad it helped.

author
ZoroThePirateHunter made it! (author)2010-10-16

HI PPLZ

author
Kiteman made it! (author)Kiteman2010-10-16

Hi.

(Who is "Pplz"?)

author

"pplz" is "peoples"for short

author
ZoroThePirateHunter made it! (author)2010-10-16

im with flanimal, you should really put up a video:D

author
Jimpiedepimpie made it! (author)2010-09-29

What are the ranges?
Are they like. Epic range.
And what does the shooting look like?

author
Kiteman made it! (author)Kiteman2010-09-29

Define "epic". If you are four inches tall, then across a room is fairly epic.

Look like? Pull the tab, the arm flips, the ammunition flies...

author
SaberSaver made it! (author)2009-03-14

wow this is so cool if only i knew how to get the template printed, lol, oh well, very cool.

author
Kiteman made it! (author)Kiteman2009-03-15

You don't have access to a printer??

author
SaberSaver made it! (author)SaberSaver2009-03-15

I do but I always have the worst luck with computers, I think they hate me, or maybe I just cant understand them.

author
hintss made it! (author)hintss2010-08-20

don't try linux :P

author
danbaha made it! (author)2010-08-16

This shoots very far for it's size! Nice work! Airsoft bb's work well.

author
Kiteman made it! (author)Kiteman2010-08-16

Thank you.

author
nickodemus made it! (author)2010-05-24

Nice work! I'd like to try this soon.

And, slightly unrelated...  Is that what a soda tab looks like in the UK?

author
Kiteman made it! (author)Kiteman2010-05-25

Thank you, and, yes, it is.

author
Kryptonite made it! (author)Kryptonite2010-05-26

There's two types here in Australia, one looks similar to the British version.

author
zexy beazt made it! (author)2010-03-27

 itz 2 flimzy

author
Kiteman made it! (author)Kiteman2010-03-27

Try it - it works rather well.

(You could also try using proper English as well - it's a site policy.)

author
Rock Soldier made it! (author)2009-01-02

Ah, so you're adding onto the war game with your shed(s) and Kitemen infrantry. What will you add next Kite man?
(I have concluded that your Kite man, not Kiteman. And thanks for teaching me how to make small text. Perhaps there is still time to make you in to Kiteman)

author
codongolev made it! (author)codongolev2009-01-02

how do you make small text?

I can only make it this small.

author
Rock Soldier made it! (author)Rock Soldier2009-01-02

add this before and after your text.
See?

author
Wafflicious made it! (author)Wafflicious2009-01-18

add what?

author
Rock Soldier made it! (author)Rock Soldier2009-01-20

comma comma shift+ six comma comma shift+six

author
zexy beazt made it! (author)zexy beazt2010-03-27

comma comma shift+ six comma comma shift+six like this

author
zexy beazt made it! (author)zexy beazt2010-03-27

,,+6,,^lik thiz

author
dombeef made it! (author)dombeef2009-06-07

Um testing

author
dombeef made it! (author)dombeef2009-06-07

Ohia

author
dombeef made it! (author)dombeef2009-06-07

Hi

author
Electroinnovation made it! (author)Electroinnovation2009-06-04

hi

author
chemy999 made it! (author)chemy9992009-05-17

like this? hello?

author
chemy999 made it! (author)chemy9992009-05-17

YAY

author
aceman 569 made it! (author)aceman 5692009-05-06

like this? see?

author
Rock Soldier made it! (author)Rock Soldier2009-05-06

Yes, like that.

author
struckbyanarrow made it! (author)struckbyanarrow2009-04-25

++hi++

author
struckbyanarrow made it! (author)struckbyanarrow2009-04-25

hi

author
bowmaster made it! (author)bowmaster2009-02-24

like this?

author
MoeMonkey made it! (author)MoeMonkey2009-04-18

weird

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Bio: The answer is "lasers", now, what was the question? If you need help, feel free to contact me. Project previews on Tumblr & Twitter: @KitemanX
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