Catapult

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Introduction: Catapult

About: My name is Jerome Sims. I am a creator, innovator, and math lover.

Materials

Wood
2 pieces each 7 1/2 inches long

3 pieces 14 inches long

2 pieces 24 inches long

1 piece 28 inches long

1 piece 10 1/2 inches long

Other

2 large and strong eye hook

20-30 long screws (can use nails but screws are better) not all will be used

a cup (this holds your projectile)

4 20-24 (the shorter the better) inch bungee cords

dowel or pipe that is about one inch thick and 12 inches long

Tools Used

Power Drill

Square

Power Saw

Chizzle with Mallet

Teacher Notes

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Step 1: Step 1

Take the two 14 inch pieces of wood and drill a hole on each one with a diameter of 1 inch. Make the center of the holes 3 1/2 inches away from the edge.

Step 2: Step 2

Make marks at 5 1/2 inches and 8 inches. Saw on the marks half way through the wood. Take a chizzle and hammer out the excess wood to make marks as shown.

Step 3: Step 3

Make a base by screwing the 7.5 inch boards to the 24 inch ones. Make sure that the 7.5 are on the inside and that the marks made in the previous step are facing outwards. Make base as shown.

Step 4: Step 4

Take the two 14 inch pieces and make a mark 2.5 inches in from the endge, only do to one of the edges but both pieces of wood. Cut half way in and chizzle the chunks off. Attach divots on the 14 inch and the 24 inch and screw them together, as shown.

Step 5: Step 5

Take the 10.5 inch piece of wood and drill it into the top of the 14 inch pieces as shown. Make sure the pieces line up at the ends and that it is on the inside.

Step 6: Step 6

Cut an angle on the 14 inch piece of wood and drill it to the outside side of the catapult. This provides strength to your catapult.

Step 7: Step 7

Drill a hole one inch from the end of 28 inch piece of wood and make sure the hole is one inch long. Insert the dowel through the right part of the base and then through the 28 inch wood and ending through the left side of the wood.

Step 8: Step 8

Drill in the eye hook that you will attach the bungee cords to. Make one on the base and one on the arm.

Step 9: Step 9

Next paint it what ever color you like. We just painted it with a wood finish, and attached a cup and the bungee cords.

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    11 Discussions

    0
    dennisriv
    dennisriv

    4 years ago on Introduction

    This is a great design and we used it for my son's science project but the directions are incorrect. It talks about cutting the notches and drilling the 14" boards but in fact it is the 24" boards that you should be using.

    0
    mocraft
    mocraft

    Reply 7 months ago

    I should have read the comments before I started the cuts. Now I have to get more lumber. The author should edit his project.

    0
    Davidster10
    Davidster10

    4 years ago

    All the pieces of wood are boards right??

    0
    EHou2
    EHou2

    Reply 2 years ago

    yes

    0
    imthegrt1
    imthegrt1

    3 years ago

    How far does it shoot

    0
    briannah31687
    briannah31687

    4 years ago

    lookas hard to put together

    0
    weyurch
    weyurch

    4 years ago

    Are these 2x4s, 1x4s, 2x2s? What kind of boards are the wood pieces?

    0
    amulder1
    amulder1

    5 years ago

    Looks great, if you want to make it stronger you could use theraband rubber. It's not expensive at all and a lot stronger. Would add a trigger mechanism if you go theraband tho...