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  • In a previous project I went to the hobby store and picked up some F-class rocket motors,

  • to try launching a rocket, made out of pool noodles. Now these motors are amazing, but

  • the catch is theyre $17 each. So in this project let’s see if we can use powdered sugar and

  • kitty litter, to make a homemade version, that will rocket up over 2,000 feet high,

  • and cost less than $0.50 make.

  • To start this project well need powdered sugar, potassium nitrate, and a cheap bag of kitty

  • litter. Were also going to need 3/4” PVC tubing and a 3/4” oak dowel. This is

  • schedule 40 PVC, and you can see I’ve cut the tube into sections 5” long, exactly.

  • The dowel is twice as long as that, and you can see if we push it inside the tube, it’s

  • actually a pretty good fit. This will be a ramming rod, and a template as well. And the

  • markings you see on the stick are designed to make the simplest form of an “E45 equivalent

  • rocket motor. The markings are actually in reverse order to how were going to build

  • it, but youll see why it needs to be that way in just a minute. Alright, let’s get

  • ready to make the rocket fuel, and to start off were going to need a small blender

  • that were not afraid to damage. I found this one at a local thrift shop for $5, and

  • the first thing we have to do is measure out 65 grams of potassium nitrate. I typically

  • get mine as a special brand of stump remover, and it’s a pretty fine grain to begin with,

  • but you can see that after blending it up for about 20 seconds, it becomes a fluffy

  • white powder, that looks a lot like powdered sugar. Now speaking of powdered sugar, were

  • going to need some of that next. So let’s zero out our scale, and add exactly 35 grams

  • of sugar to the mix. At this point the powder is a pyrotechnic composition that could ignite

  • with too much heat, so instead of mixing this up with the blender, were going to have

  • to shake it by hand for about 3 minutes. This should give it enough time to blend completely,

  • and that’s important because we need this white mix to be as intimate as possible. Alright,

  • our rocket fuel is finished, so let’s transfer it to another container to free up the blender,

  • because now it’s time to bring out the kitty litter. This 7 lb bag was only $0.98, and

  • surprisingly, the cheap kind is the best kind, because it doesn’t have any fragrances or

  • dyes added to it. It’s just a big bag full of bentonite clay, which is probably why the

  • stuff is as cheap as dirt. Alright let’s throw a handful of clay into the blender for

  • 10-20 seconds so it grinds into a power. Holding the blender at a bit of an angle helps mix

  • it better, and reduces the load, on the motor as well. Now when it’s time to remove the

  • lid, it’s important to wear a mask, or do it outside. Because you can see the powder

  • is so fine it escapes like a gas, and its not really good to breathe this stuff in.

  • Ok, weve got everything we need, so let’s get to work putting it all together. Place

  • one of the PVC casings on a slab of concrete, and drop in a third of a tablespoon of kitty

  • litter. Now let’s make sure we keep the tube firmly on the concrete so the clay doesn’t

  • spill out the bottom, then slide the oak ramming rod inside, and smack the top firmly with

  • a rubber mallet. It’s going to need about 5-10 good whacks, to compact it as tight as

  • we need it. And you can see it will make a nice little clay plug, at the bottom of the

  • tube. Let’s repeat this process 2 more times until the plug is 3/4” thick, which you

  • can see is conveniently indicated by the marking on the stick.

  • If too much clay gets packed in, no worries. You

  • can just twist the dowel around a few times to loosen the top layer, then pour out the

  • extra clay until it lines up perfectly. At this point, were ready to add the white

  • mix. This stuff is extremely light and fluffy, so it’s important to push the ram rod down,

  • very slowly. Once it’s compacted by hand

  • though, we can ram it with the mallet, just like we did the clay, until the rammedwhite

  • mixlines up perfectly with the next marking. The last step for this simple motor is a kitty

  • litter end cap. This will be 3/4” thick as well, the same as the one we made before.

  • But here you can see there’s still a little room left in the tube, and youll see what

  • that’s for in another project video. Ok our rocket motor is just about finished. The

  • only thing left to do is make the nozzle. For these motors I use a 7/32” drill bit,

  • which happens to be the exact length and width we need to turn this rammed powder tube, into

  • a core burning rocket. Now to gauge the depth on how far in to drill, we can use the markings

  • on the ram rod to measure exactly where the white mix ends, then mark the drill bit at

  • the point where it lines up with the clay. Now it’s really important to drill this

  • out very slowly and carefully because, remember, this is a rocket motor, and you don’t want

  • to set it off by accident. I’m drilling mine out by hand, so it’s easy to control

  • any heat generated, from the friction. When the marking on the bit lines up with the bottom

  • of the casing, the rocket motor is finished and should look something like this. Now to

  • test the power of these motors I went way out into the dessert, miles and miles away

  • from any people, property or anything flammable. When this one lit off I was blown away by

  • what it could do. The motor, just shot up 2,300 feet high. And of course if weve

  • got rockets going that high, were going to need a way to deploy, some kind of a recovery

  • system. So the next step, is to give our rocket motors a built in time delay, and a parachute

  • ejection charge. The 100 gram batch in this video is enough to make two “E45 equivalent

  • motors, with about 20 grams of propellent left over. Which is what I mix with baking

  • soda, to slow the burn, and create a 5 second delay. So watch for those modifications in

  • another video. Well now you know how to repurpose some simple household items, into powerful

  • hobby rocket motors, for less than $0.50 each. Just make sure you have the right permits,

  • location, and common sense before you try launching them. Well that’s it for now.

  • If you liked this project, perhaps youll like some of my others. Check them out at

  • www.thekingofrandom.com

  • If you are even considering the thought of trying to build one of these, please promise

  • me youll do one thing first. Get on google and do a search for local rocket clubs. They

  • don’t cost much, and theyll have the best idea of how to keep you out of trouble

  • with the FAA, and make sure nobody gets hurt. Having said all that, I hope you felt the

  • same excitement for this project that I did. I’ve spent 4 years playing with different

  • variations of sugar motors to get to this point, so I’m super excited to finally be

  • able to present this to you. Now going forward, you can expect to see a few more rocket related

  • videos, and then were getting into metal melting projects, so please make sure youre

  • subscribed to my channel because I’d really like to see you around for those project videos.

  • I’ll talk to you then.

In a previous project I went to the hobby store and picked up some F-class rocket motors,

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如何使糖火箭 (How To Make Sugar Rockets)

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    何紹愷 發佈於 2021 年 01 月 14 日
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