How To Build A Small Onager

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How To Build A Small Onager
"An Onager is a type of catapult that uses the torsion of twisted
string or rope as the force for firing" . This is a terrific little
Onager project you can easily build out of popsicle sticks. This tutorial was created by Tom Wilson. My thanks
to him for this project. You will quickly see why this style of catapult was named after the onager, a wild donkey
famous for its kicking ability. Invented by the ancient Romans, it was still used by pretty much everyone in
medieval Europe for smashing fortresses, throwing bombs, and generally blowing everything up.
Home
Surprisingly powerful, cheap to make, robust under combat conditions, and much simpler to operate than the
finicky trebuchets, this ancient machine continued to be used right up the end of the middle ages, when it was
finally replaced by cannons.
Onager (Torsion powered)
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Table of Contents for this
tutorial
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1. Make the Table Top
Troll Catapult Home
and materials requred
2. Begin assembly of
the sides and base
3. Assemble the
catapult firing arm
4. Complete the
assemblly and
finish by painting Pros:
5. Video of this
catapult firing
­­Historically authentic
6. DVD's
­­Looks cool
Documentaries
­­Powerful and accurate
about siege
­­Easy to operate and aim
engines
­­Simple, small, portable
7. Free Catapult Plan
­­Mostly easy to build
8. Send me your
catapult pictures! Cons:
Check out My Store:
Siege Engines you can
buy at amazon.com
Unusual Siege Engine
Kits
­­Difficult to modify once built
­­Hard to repair if the rope breaks
­­May lose some of its power over time (because the rope stretches)
­­The firing mechanism is difficult to build and may require extra help
Materials:
Kits to make big Siege
Engines .
5 Full Sticks
5 Sticks cut or broken in half
3­4 feet of string
1 ½" square of paper
Scissors
Hot glue
How to Build It
Working Wood Catapult
DIY Kit, 6" X ...
Pathfinders
Best Price $18.95 or Buy New $18.95
• Make the base and the uprights
Glue together four full sticks and four half sticks, "log cabin" style. Put the half sticks
on the bottom.
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Attach two half sticks, flat side down, in the middle of the long side of the base, as shown
below. These are the uprights.
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Brace the uprights with two half sticks, as shown below.
Attach a half stick across the uprights, on the opposite side from the braces. This is the
crosspiece.
??How would attaching the crosspiece higher or lower affect the performance of your catapult? You might
attach it with masking tape, so you can try it in several places before you glue it.
Make the throwing arm
Tear your piece of paper to the center. Fold it into a cone and glue together.
Use scissors to trim the sharp corners of the cone.
Smash the tip of the cone flat and glue it to the end of a full stick.
Attach the rope.
??How would different types of strings affect the performance of your catapult? You might try using wool
yarn, artificial sinew (waxed cotton), jute or nylon twine, or other kinds of string. The ancient Romans used
rope made of sinew or hemp, but both of these materials are very hard to find these days.
• Take your piece of string and fold it in half. Hold the folded tip in your lips (or get a friend to hold it for you)
and twist the string together ten or twenty times.
• Fold the string double again, but let the string hang by one end. It should twist itself together part way. Again,
hold the loose ends in your lips and twist it all the way.
• Repeat step B once more. You should now have a strong, thickly twisted rope.
• Thread the rope between the two full sticks under the cross piece, as shown below. Tie in place around the top
stick with a square knot or double overhand knot. Move the knot to the side.
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??What advantages and disadvantages might come with using thicker or thinner string? What changes would
you have to make to your base if you were to use a thicker string?
Attach the arm
!!!You might need a friend to help with this step­it is difficult with only two hands. Either way, have your glue
gun and throwing arm handy before you begin.
• Take your remaining half­stick and cut it in half again. This is your rope twister. Insert the
flat end between the ropes. Twist backwards (away from the uprights) the desired number of
times.
??How many twists should you put on the rope? How will a tighter twist affect the performance of your
catapult? Are there any risks to a very loose or very tight twist?
• After you have the rope twisted as tightly as you want it, put a generous gob of glue on the rope twister. Attach
the throwing arm and hold in place for a minute or so to let the glue set.
• If you did it right, the arm should smack against the crosspiece when you let it go.
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• Holding the base with one hand, pull the arm all the way down. Put the projectile in the cone. Release.
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The Desktop Onager: An Awesome all Wood and Twine War Machine ­ Fiercely Fend
Off Office Rivals ­­ Conveniently sized to sit on your desk, this intimidating little
machine is an actual working reproduction of an onager. ­­ The weapon is all wood and
twine with no metal parts, but it packs a big punch. Load it up with the included
wooden balls or get creative with marshmallows, coffee creamers, erasers and more to
see how many cubicles they can soar above before landing. ­­ Properly constructed, the
onager has a range from 10 to 20 feet. The ancients were able to use nothing but wood
and ropes to build machines that could hurl heavy stones great distances, now you can
do the same to enforce peace in your office or dorm room. ­­ Build it yourself in under three hours, because this
kit includes everything you need except for glue and a few simple tools like scissors, sandpaper, and a file.
Colors may vary. ­­ Warning: This is a representative model of a real ancient military weapon. Use only with
competent adult supervision.
Craft Sticks ­ Natural 150 count by Chenille Kraft
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Popsicle sticks have been a staple of easy and creative fun for as long as there have been
popsicles. A little glue, paint or other things can really set the creative wheels in motion. Here
is a book of more projects with craft sticks
Look What You Can Make With Craft Sticks: Over 80 Pictured Crafts and Dozens of Other
Ideas (Craft)