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If you enjoy this project, then check out my books: Rubber Band Engineer and Duct Tape Engineer. || More engineering projects || Everything I make

Project Goal: Students build and modify a simple trigger-release cork launcher that fires at least 10 feet

Design Variables: Number of rubber bands, length of the launcher, number of combined launchers

Key Concepts

  • Trajectory is the path that an object follows through the air or other fluid
  • Trigger is a device that sets off a mechanism

Prep: Carefully cut corks into quarters (2 per student)

Safety: Always aim cork launchers away from people, even when unloaded.

Step 1: Materials

Please message me to report broken links. All of these materials are used in my other Instructables for kids, so your purchases can be used across multiple projects.

For the basic model, you'll need:
6 craft sticks
3 craft cubes
2 rubberbands
1 clothespin

Synthetic cork
Hot glue
Tape


Step 2: Frame and Trigger

In the first picture, the sticks appear to be long shallow steps, descending from right to left. This is necessary because the rubber band will be released from right to left. If the edge of the craft stick is exposed, it may catch the rubber band and cause the shooter to not work properly.

Two cubes are placed close together on one end to support the trigger. This will make more sense in the next step.

Finally, the trigger (clothespin) is glued on.

Step 3: Attach the Rubber Band

The rubber band that is used to fire the cork is simply taped to the front of the shooter.

Bonus! If you choose not to tape the rubber band to the front, then you'll have a rubber band launcher!

Step 4: Load and Fire!

Use a utility knife or other tool to cut a piece of cork into a disk shape. This will help tremendously with the aerodynamics of cork.

To load: use two fingers to pull the rubber band back into the open trigger. Close the trigger, then let go of the rubber band. Insert the cork disk between the strands of taut rubber band.

Launching is easy: just aim and push the clothespin!

Try to limit the number of cork disks the students can take home

Step 5: Advanced Ideas: Hinged Double Launcher, Cork Launcher Car

The skewer can be slid out of the frame, which allows for different cork launcher designs to be interchanged. The example pictured has a basic cork launcher and an arrow launcher.

An arrow launcher fires projectiles that are identical to these. The basic example has one modification: a pair of small guide sticks glued at the front of the launcher. This increases reliability and accuracy.

The Cork Launcher Car is more than just a cork launcher on wheels. A craft stick glued to the end of the clothespin acts as a trigger. When the car is pushed into a wall, the craft stick leverages the force of the impact to open the clothespin, which automatically launcher the cork. Be Careful! Always place yourself to the side of the car's path. Never position yourself directly in the path of the launcher. This is esay to forget because it is very intuitive to push the car directly away from oneself. Always stay to one side.

Step 6: Tips and Troubleshooting.

  • The design in this Instructable shows the cork launcher in its simplest form. Encourage the students to make modifications.
  • Don't allow the students to launcher craft cubes. It is much denser and performs better than cork disks, but it is also more dangerous.
  • This activity is very easy - older students may complete it in as little as 10 minutes. For added longevity, set up targets or other challenges.
  • As students are building, make sure that they do not accidentally make a mistake on the first step. An edge of a craft stick or other imperfection that impedes the release of the rubber band is not uncommon and takes time to fix.
  • You may want to tape the rubber band on for some students. It's a quick thing to do, and younger students tend to struggle with it.
  • If a student is having trouble loading the cork launcher, show him/her how to load it in 3 steps or less, i.e. 1. Hold the launcher in one hand and use that hand to open the clothespin 2. Use two fingers to pull the rubber band back into the clothespin 3. Release the clothespin, then the rubber band.
<p>omigosh. It worked so well. I messed up on step 2 though. I put the second line of popsicle sticks on upside down, so it was left to right. It still worked though.</p><p>thanks!! </p>
<p>Interesting</p>
<p>awsome</p>
Very cool can't wait to make one
<p>i made one and im happy noww ;)</p>
<p>Nice and simple. Great project, man! I've built a launcher for me. A little bit different, but it works too.</p>
<p>great project</p>
<p>made this and it shot like Kobe #greaterthanMJ</p>
<p>hahahahahahaha yah u wish he's not even good. MJ all the way.</p>
<p>you could launch aircraft.cars or boats with this a peg at the bottom of a wood car to ketch the rubber band. place the peg in the front middle and back launch from each to see what the results are. make a glider from a straw and foam for wings or any part you want. Looks like fun.</p>
try using this design just try converting it to a crossbow or trebuchet. but i still love all your projects!:)
Where would you get craft cubes from?
Lance - have you considered modifying/combining this with the Rocket launcher project? With the right modifications this would probably launch the rockets pretty well.
Hey Don, good to hear from you. Yes, I considered this, and I tried shooting straws from these in my class earlier this morning. It does work quite well! But it is a little bit more difficult for the students to use.
Same here...as always Lance makes the engineering connect! I love the connection to Angry Birds. We NEED more educators like Lance!

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Bio: I'm a writer, maker, and educator. For free lesson plans and teaching materials, check out LanceMakes.com.
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