Introduction: The Big Bang (pocket-sized Rocket Launcher)

Picture of The Big Bang (pocket-sized Rocket Launcher)

This little gadget can send a small Coke bottle up to 300' with ease. But be careful, this little devil can cause some serious damage to people and property if not used responsibly. Adult supervision is recommended.

USE AT YOUR OWN RISK!

Step 1: Gather Your Supplies.

Picture of Gather Your Supplies.

1. Coke bottle cap.

2. Tubeless tire valve.

3. Knife or drill bit.

Step 2: Warning!

Picture of Warning!

Don't use a water bottle cap. I've tried this style of cap before, and at 200 psi they usually blow up!

Step 3: Drill or Cut a Hole for the Tire Valve.

Picture of Drill or Cut a Hole for the Tire Valve.

Try to center the hole better than I did. I'll have to get another cap. :(

Step 4: Shove the Tire Valve Though the Cap.

Picture of Shove the Tire Valve Though the Cap.

Step 5: Strip Off the First Course of Threads on the Cap.

Picture of Strip Off the First Course of Threads on the Cap.

This takes a lot of practice. Be extremely careful!

The gray cap is before the thread removal and the blue one is after.

Step 6: Testing.

Picture of Testing.

The goal is to strip enough threads so the bottle cap can be removed in one turn. Only remove a little bit of plastic at a time. Then test. If you remove too much plastic the airtight seal will be compromised.

Step 7: Launching.

Picture of Launching.

Use the pics above as a guide for how to properly rotate the bottle. Practice without air pressure until you have completely mastered the motion. When you feel comfortable with the twisting motion, try only a little bit of air pressure: about 20 psi. Make sure to let go of the bottle as soon as it is fully open. Getting the feel for this is tricky, so don't get discouraged. Once you are comfortable with that slowly increase the psi in small increments. Don't go over 150 psi. Past that point you risk an explosion!

Comments

killbox (author)2015-07-01

might consider taking a strip of rubber, (perhaps 24" of old bike inner tube) and wrapping it clockwise around the bottle , then holding the cap, you could tug on the rubber spinning the bottle. as soon as the rubber has spun the bottle free it should disengage and let the bottle fly, (may need some trial and error for length /number of wraps)

BikeHacker (author)killbox2015-07-06

Wow, cool idea. It would make it a lot safer!

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Bio: I'm a high school student who loves making and hacking stuff!
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