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Science project ideas for 3rd graders: How to make a science DIY fan at home

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When you feel warm, you probably turn on your electric fans to reduce the temperature, we also have portable battery-powered fans everywhere these days. But for today, we're going to try something exciting: which to learn How to make a homemade science fan that does not require any batteries or wires. This fan will make use of only mechanical energy to produce wind energy.

If that sounds as interesting to you as it is to me, then you should continue reading to find out how it is done.

This Do it yourself fan can be an interesting science project for third graders.

Needed materials

  • Empty small toothpick container.

  • Toothpick stick.

  • Cardboard paper of size: 4x4 inches.

  • Scissors.

  • Pencil.

  • Ruler.

  • Tape.

  • Rubber band or Wool string.

  • Glue.

  • Paper clip

  • Nail or pointed-tip object.


Follow the steps below to make your DIY fan!

Step 1:

With a ruler and pencil, draw diagonal lines from each corner to the center of the 4x4-inch cardboard. Cut along the lines towards the center of the paper but not all the way through, then label the corners as shown.

Step 2:

Fold the four labeled ends of the paper towards the middle of the paper then secure with tape. Our fan blade is now ready.

Step 3:

Make a tiny hole at the center of the blade then pass one end of the toothpick perpendicularly through the hole on the blade. Secure the stick and blade with glue.

Step 4:

With adult supervision, use a pointy-head object to make a hole at the center of the cover of the toothpick bottle (slightly bigger than the width of the toothpick stick)

Step 5:

Insert the remaining leg of the toothpick attached to the blade through the hole on the cover, with the blade resting on the flat side of the cover.

Step 6:

Now, make two holes in the toothpick container (first one at the bottom center and the second on the side of the container)

Step 7:

Cut your rubber band and pass through the hole on the side of the container then out of the mouth of the container.

Step 8:

Tie the end of the rubber band coming out of the mouth of the container to the toothpick stick.

Step 9:

Push the toothpick with tied rubber into the bottle and secure the cover properly on the bottle. (The other end of the toothpick should come out of the hole on the bottom of the container)

Attach the remaining end of the rubber band to a paper clip to prevent the rubber from going inside the bottle. Also, wrap tape around the toothpick pointing out of the bottom of the container to prevent the stick from going inside the bottle.


This fan works by pulling the rubber band attached to the toothpick stick. Initially, the rubber is wrapped around the stick by turning the blade with your hand.

To activate the fan, pull the rubber by dragging the paper clip and releasing it. The force will help the rubber band recoil back on the stick - thereby turning the stick which in turn turns the blade. The recoil eventually weakens after some time and you need manual recoil again.

Demo video:

If you followed up till this point: Congratulations!!! Hopefully, your fan is working.

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