In this step by step tutorial I will be showing you how to make your very own Homemade Viking Catapult!
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Step 1: The Materials
You will need 5 sticks that are are 4-6 feet long with a diameter of 1-2 inches. I am using 4 foot long sticks. The 2 shorter sticks you need will be 2-3 feet long also with a diameter of 1-2 inches. I am using 2 foot long sticks. You will need all of the items shown in the picture. You will also need something that will make a hole about 1/2 an inch wide, such as a drill.
Another thing you will need is approximately 60 inches of elastic band that has a diameter of about a half of an inch. Another thing you will need is some sort of bowl of cup to use as the holder for the item you will launch. Pictures of these items come later in this instructable.
Step 2: Lashing/Tying the Twine
Start by tying together two of the longer sticks together. You may use any method you want to tie the sticks together with the twine, but using a proper "lashing" technique is recomended. The sticks need to form a 60 degree angle when crossed. Square Lashing works great and it was what I used. You can learn how to do it here: http://www.youtube.com/watch?v=9MelDZc2rgk
Step 3: Making the Bases
Once you have tied the two sticks together you need to tie another one of the long sticks on top of the ends of the sticks you just tied together, as shown in the picture.
Step 4: Attaching the Uprights
Take the last two long sticks and again tie them together at a 60 degree angle. Once you have done that, tie the ends of the two sticks you just tied together to the top stick of the base. Make sure to do this on the inside of the base as shown. Also these two uprights should be at about a 45-60 angle depending on the trajectory you want.
Step 5: Adding the Supports
You now need to tie the two smaller sticks onto the catapult. The sticks will go from halfway down the upright to halfway across the base stick, both tied onto the outside of the sticks. These sticks are for structural support when firing your projectiles.
Step 6: Making the Launch Bowl
The supplies you will need for the next 2 steps are 60 inches of elastic band cut into thirds and any type of round bowl. I used half of a cool whip container for my bowl. To start you need to drill three holes into the bowl that are the same distance away from each other towards the top that are about 1/2 of an inch wide.
Step 7: Adding the Elastic Bands
You can start by reinforcing the holes with duct tape. Then you can attach the bands to the bowl with the nylon thread as shown in the picture. Tie each elastic tube tight so they do not slip out of the projectile holder.
Step 8: Attaching the Bowl
You can tie bands onto the uprights with a regular square knot. Do this with all of the bands. tie them halfway down/across the sticks as shown in the picture.
Step 9: Final Product
Have fun with this instructable and be careful when shooting your Viking Catapult. It launches water balloons really well!