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DIY Rocket Propellant! How to Cook Solid Rocket Fuels Using Common Household Ingredients

Nov 1, 2012 06:07 PM
Dec 6, 2012 05:53 PM
Fire hydrant releasing water and smoke.

Cooking isn't something that interests me much, unless it results in a fast burning fuel and a successful rocket launch!

WARNING: Ignition of an incendiary or explosive material may not be legal in your area, so check local laws before attempting. Use of this video content is at your own risk.

Using some kitchen chemistry and a few common household items, I tested a few different methods for DIY rocket fuel.

Cleaning supplies and ingredients arranged on a table.

The main components of this composition are a brand of stump remover, which is 100% potassium nitrate (KNO3), and plain white table sugar.

Stump remover granules packaging.
Container with a labeled lid and a thumbs-up gesture in a casual outdoor setting.
Stump remover granules packaging.
Container with a labeled lid and a thumbs-up gesture in a casual outdoor setting.

When mixed together in ratios of 60/40 by weight, and placed on medium heat, they melt into a creamy brown liquid. This is because the sugar caramelizes and absorbs the KNO3. The smell is similar to that of making candy, and that's why this is sometimes referred to as "Rocket Candy" or "R-Candy".

Cooking batter in a frying pan.

When it's runny enough, it can be poured into a casing to cool down and solidify. I'm using these Mega-Block LEGOs. Watch out, it's hot!

A person pouring a mixture from a pan into colorful molds with clamps on a table.

I tried some more batches with other ingredients added, like water, corn syrup and even a little home made rust powder.

Colorful blocks of different textured materials arranged in a row.
Bottle of Karo syrup being poured into a cup next to a cooking pan.
Cooking process with seasoning being added to food in a frying pan on a stovetop.
Chocolate sauce being stirred in a pot on a stovetop.
Colorful blocks of different textured materials arranged in a row.
Bottle of Karo syrup being poured into a cup next to a cooking pan.
Cooking process with seasoning being added to food in a frying pan on a stovetop.
Chocolate sauce being stirred in a pot on a stovetop.

All the fuels burned a little differently, but overall I was most impressed with the batches using the homemade rust.

Rocket engine firing with smoke plume.
Smoke emerging from a device against a stone wall.
Rocket engine firing with smoke plume.
Smoke emerging from a device against a stone wall.

I made another batch and packed it into a homemade rocket motor casing that had a nozzle made from kitty litter. I was impressed to see it actually worked! I think this rocket shot up a couple thousand feet.

Rocket trail in clear blue sky.

If you missed the video at the beginning of the article, scroll up or watch it directly on YouTube! If you liked this project, perhaps you'll like some of my others. Check them out at thekingofrandom.com.

The next big software update for iPhone is coming sometime in April and will include a Food section in Apple News+, an easy-to-miss new Ambient Music app, Priority Notifications thanks to Apple Intelligence, and updates to apps like Mail, Photos, Podcasts, and Safari. See what else is coming to your iPhone with the iOS 18.4 update.

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