Play Catapult

The catapult is a machine used to hurl projectiles a great distance. A well-constructed catapult is an effective tool used to launch a variety of objects. Throughout history catapults were one of the most effective and powerful devices used in warfare. Today the art of designing and building catapults is a popular science project that demonstrates the laws of physics, projection and gravity. With a 2-foot long base and a 3-foot long throw arm, the outdoor catapult can launch objects 10 yards.

Instructions

Build the Framework

1 Put on the safety goggles. Lay the wood flat with the wider surface facing up. Make a mark 3 1/2-inches from the end of a 24-inch wood piece. This is the catapult's pivot hole. Drill a hole about 1-inch in diameter, wide enough for the broomstick to slide through it.
2 Make a mark at 5 1/2-inches and at 8-inches from the same end of the wood. Draw lines over your marks and across the top side of the wood. Draw two lines about 1/2-inch down each side of the wood and connect the parallel lines on either side, forming the outline of a rectangle.
3 Saw the parallel lines across the top of the wood. Chisel and hammer the lines along the sides of the wood. Remove the rectangular slot formed from the wood block.
4 Repeat Step 1 through Step 3 with the other 24-inch piece of wood.
5 Mark a line 2 1/2-inches from the end of a 14-inch wood piece. Saw over the marked line and half way down both sides of the wood. Continue to saw until you remove the 2 1/2-inch rectangle, leaving a hollowed out end at one side of the wood piece.
6 Repeat Step 5 for a second 14-inch piece. Cut out and remove only one end of each piece.
7 Fit the end of the 14-inch piece into the cut-out rectangle of the 24-inch piece to form a T shape. Align the sides of both pieces across the top of the T formation. Each piece should fit snugly.
8 Screw the two perpendicular pieces in place. One 14-inch piece of wood should still be left. Do not cut a rectangular slot into the third wood piece.
9 Place the two 24-inch pieces and the two 7 1/2-inch pieces on their sides, parallel to each other. Screw the corners of the two 24-inch pieces and the two 7 1/2-inch pieces together to form a rectangle. The cut out rectangles on the two 24-inch pieces should be aligned and face the outside of the rectangle, not the inside.
10 Screw one of the large eye hooks into the outside center of the 7 1/2-inch piece closest to the rectangular slots.
11 Screw the 10 1/2-inch long wood piece across the top of the two upright 14-inch pieces. Attach the piece to the side that is farthest from the metal hook.
12 Measure and draw lines along the ends of the remaining 14-inch wood piece by holding it against the backside of the horizontal 10 1/2-inch piece and the top of the 7 1/2-inch piece with the hook. Saw off the angled lines to form slants on both ends. Fit the custom cut piece over the center of the 7-inch wood piece and against the center of the back of the 10 1/2-inch piece.
13 Screw the cut wood into place to form an angle connecting the two horizontal pieces. This adds strength to the catapult.

Build and Install the Swing Arm

14 Drill a hole through the width of a 28-inch wood piece about 1/2-inch from the end of the wood. The diameter should be wide enough for the broomstick to slide through it. The 28-inch wood piece, or the swing arm, should fit loosely over the broomstick and rotate freely.
15 Find a small cardboard cup or cut down a plastic cup until it is two inches deep. Staple or glue the cup to the other end of the wood, opposite the side with the hole. The cup holds the projectile in place.
16 Screw the other large metal hook about 1-inch down from the cup into the center of the 28-inch long swing arm.
17 Slide the 12-inch long broomstick through each of the three holes previously drilled into the end of the catapult, the swing arm and the other end of the catapult. Drill a few screws into the long swing arm and the broomstick to hold it firmly in place.
18 Hook each end of a bungee cord to each of the metal hooks.

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