Prepare yourself for coke + mentos awesomeness!
This is an easy-to-make instructable on how to have some fun with Mentos and Coke.

Step 1: Get Your Materials

• 1 Two-liter bottle of carbonated soda (preferably diet coke)
• A skateboard (or any platform with wheels)
• Duct tape
• A rubber cork/stopper (we used 15/16th inch by 3/4th inch). Available at any hardware store.
• 5 Mentos

Step 2: Prep the Mentos

Tape the 5 mentos stacked together with a vertical piece of tape so that they fit in the bottle

Step 3: Prep the Cork

Tape the strung mentos to the bottom of the cork.

Step 4: Prep the Skateboard

Tape the bottle to the skateboard so that the neck of the bottle sticks out the back.

Step 5: Insert the Mentos

With the coke facing up, unscrew the cap. Slowly insert the cork with mentos attached so that the mentos don’t touch the coke immediately.

Step 6: Prep for Launch

Flip the skateboard facing the direction you want to launch while HOLDING THE CORK TIGHTLY ONTO THE BOTTLE. Shake if possible.

Step 7: Watch It Launch

Release your grip on the cork and watch it launch!
<p>Youtuber Stephen Sharer exploded a pumpkin using Coke and Mentos!!!</p><p>https://www.youtube.com/watch?v=Z-B-73MOcYo</p>
This seems like a good replacement for the C02 cartridge car competition. Less dangerous, more fun (except for the janitors).
Very cool!<br><br>Maybe you can make a hole of about 8 - 10 mm in the cap and screw it at launching time, instead of leave the bottle open. That would give a boost far greater, I think.
I think he did it the way described because you have to slam the cork on pretty quickly after dropping in the Mentos. With a screw cap, it'd be harder to get it closed, and with a hole in the cap it would start spewing right away, fizzling out the launch.
No, if you look the video carefully you'll see the mentos strip does not reach the liquid. So it's perfectly possible to screw the lid, plug the hole with the palm of the hand, shake the bottle and leave it horizontal. What may happen is that a mento block the hole, which should be avoided with some kind of grid. I don't make those experiments, but I seek them done by other.
That's a good idea! We noticed, however, that the gas and the coke were far too much for any of us to hold in with brute strength - we needed to have the added friction of the stopper against the bottle. Although we could just have cut that hole, and used a smaller stopper in that hole, which would have fixed that problem. Then the mentos could be attached to the stopper and not the cap, which means that the mentos blocking the hole also wouldn't be a problem.
Please let me know if you do the experiment.
awesome, next you have to ramp it up so it propels a rider as well!
Awesome! You should attach like 5 bottles so it goes SUPER SPPEED!!! btw 5*
Very cool! I think you could eliminate the &quot;holding the cork&quot; part with a PVC pipe fitting. Attach a &quot;<a href="http://www.mcmaster.com/#pvc-pipe-fittings/=dczlqd">45-degree Y</a>&quot; or &quot;<a href="http://www.mcmaster.com/#pvc-pipe-fittings/=dczjwp">long-turn Y</a>&quot; fitting to the neck of the bottle, with the curve pointing upward. You can drop (or throw) the Mentos in the curved part, and they should roll down into the soda, and the exhaust blast should come out the straight section.

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