perfect shape, but it should be long, skinny, and pretty straight. Once you have wrapped the cardboard into a tube, have a grown-up help you cut off any extra cardboard. Use the tape to hold it in the shape of a tube.
       3. Make fins to help the ship fly straight. In ancient times, creating fins with feathers, like on an arrow, was called fletching. Weâll use more cardboard to make ours. You can choose how you shape your fins. Ask an adult to help you cut them. Definitely decorate themâmaybe by drawing Ohmâs face on one!
       4. Then tape two fins to the bottom of the ship so they stick out evenly on both sides like wings of a plane. Tape another fin to the top of the ship so it appears to have three equally sized fins.
       5. Cushion the front tip of the ship with something in case it hits anything delicate. You can use anything thatâs small and soft, but a piece of a dry, squishy kitchen sponge can work really well. With help from an adult, cut a little square out and tape it on the tip of the ship.
Building the Atlatl
       1. Cut a small piece of cardboard in the shape thatâs shown in the picture. Cut it so that the cardboard can fold easily in half along one of the corrugation pieces. Fold the shape in half, and then tape it to the end of the stick.
       2. If you canât find a stick the right size, you can make your own using the same technique you used to make the dart.
       3. Tape the folded cardboard shape, or hook, onto the atlatl with one half of the hook on each side. Be sure to tape it tightly, and consider reinforcing it further with some tape. During a good throw, itâs likely to undergo some high forces!
       4. You might want to add a little grip on the bottom of your atlatl so itâs easier to hold on to during a throw. You can tape a piece of cardboard onto the bottom of the atlatl, or make up your own grip enhancement.
Launching Ohm Back Home: Throwing with the Atlatl
       1. Put the back end of the spaceship, where the fins are, into the atlatlâs hook. Hang on to the atlatlâs grip, and reach around the shaft with your thumb and fingers, using them to pinch the shipâs long body and hold it in place parallel to the atlatl. Youâre ready to throw!
       2. Throwing with the atlatl uses the same motion as throwing a baseball, so use exactly the same technique. The atlatl will naturally let go of the ship at the right time.
Experiment Time
Youâll probably have some success to start off with, but here are some ways you can work on the design and your own throwing motion to get the most out of your atlatl project.
       1. Aim at different angles. Try throwing in a more upward direction. Does the ship fly in the path you expected? How might you adjust the angle youâre throwing at so that it flies along the trajectory you want?
       2. Try a different length of ship. It helps to have a longer ship, because itâs harder for a long spaceship to tilt itself in a different course from the one you started throwing it in.
       3. Test a different length of atlatl. If a long lever is good, is a longer lever better? Try a few different lengths of atlatl to see which gives you the most leverage. Do different atlatls require different techniques to throw effectively?
       4. Try throwing at different speeds. An effective throw will combine raw power with good technique. You may want to experiment with a lower power throw that you can control better before adding additional throwing effort.
Safety Notes
       â¢Â   Do this experiment with an adult! The adult isnât there to do the
       3. Make fins to help the ship fly straight. In ancient times, creating fins with feathers, like on an arrow, was called fletching. Weâll use more cardboard to make ours. You can choose how you shape your fins. Ask an adult to help you cut them. Definitely decorate themâmaybe by drawing Ohmâs face on one!
       4. Then tape two fins to the bottom of the ship so they stick out evenly on both sides like wings of a plane. Tape another fin to the top of the ship so it appears to have three equally sized fins.
       5. Cushion the front tip of the ship with something in case it hits anything delicate. You can use anything thatâs small and soft, but a piece of a dry, squishy kitchen sponge can work really well. With help from an adult, cut a little square out and tape it on the tip of the ship.
Building the Atlatl
       1. Cut a small piece of cardboard in the shape thatâs shown in the picture. Cut it so that the cardboard can fold easily in half along one of the corrugation pieces. Fold the shape in half, and then tape it to the end of the stick.
       2. If you canât find a stick the right size, you can make your own using the same technique you used to make the dart.
       3. Tape the folded cardboard shape, or hook, onto the atlatl with one half of the hook on each side. Be sure to tape it tightly, and consider reinforcing it further with some tape. During a good throw, itâs likely to undergo some high forces!
       4. You might want to add a little grip on the bottom of your atlatl so itâs easier to hold on to during a throw. You can tape a piece of cardboard onto the bottom of the atlatl, or make up your own grip enhancement.
Launching Ohm Back Home: Throwing with the Atlatl
       1. Put the back end of the spaceship, where the fins are, into the atlatlâs hook. Hang on to the atlatlâs grip, and reach around the shaft with your thumb and fingers, using them to pinch the shipâs long body and hold it in place parallel to the atlatl. Youâre ready to throw!
       2. Throwing with the atlatl uses the same motion as throwing a baseball, so use exactly the same technique. The atlatl will naturally let go of the ship at the right time.
Experiment Time
Youâll probably have some success to start off with, but here are some ways you can work on the design and your own throwing motion to get the most out of your atlatl project.
       1. Aim at different angles. Try throwing in a more upward direction. Does the ship fly in the path you expected? How might you adjust the angle youâre throwing at so that it flies along the trajectory you want?
       2. Try a different length of ship. It helps to have a longer ship, because itâs harder for a long spaceship to tilt itself in a different course from the one you started throwing it in.
       3. Test a different length of atlatl. If a long lever is good, is a longer lever better? Try a few different lengths of atlatl to see which gives you the most leverage. Do different atlatls require different techniques to throw effectively?
       4. Try throwing at different speeds. An effective throw will combine raw power with good technique. You may want to experiment with a lower power throw that you can control better before adding additional throwing effort.
Safety Notes
       â¢Â   Do this experiment with an adult! The adult isnât there to do the
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