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What is rocket candy?
Rocket candy is a type of fuel used for model rockets that is made from sugar and an oxidizer. Rocket candy, aka caramel candy, is called such because of its sugar content and appearance of caramel. Because of its oxidizer content it obviously should not be consumed.
Materials
-Scale/Balance
-Table Sugar
-Corn Syrup
-Salt Peter
-Beaker/ Heat safe container
-Hot Plate/ Electric Skillet
-Mortar and Pestle/ Grinder
-Used rocket motors
-Drill and Drill bits
-Dowel Rod
-Model Rocket, Igniters, Launch Pad, etc
-Safety Gear (goggles, gloves, etc)
Warnings
Making rocket fuel is dangerous. There is potential for personal injury including poisoning and burning. This is to be conducted outside under adult supervision and in an open air environment. The creator of this instructable is not personally responsible for any injury resulting from the creation or use of this rocket candy. All safety precautions should be followed including those of the manufacturers of the rockets themselves. Take care, while fun, rockets are still dangerous.

Step 1: Ingredients

This specific type of rocket candy calls for 3 ingredients. An Oxidizer, Potassium Nitrate (KNO3, aka "Salt Peter"). And two types of fuel: Sucrose (table sugar), and Fructose (Corn Syrup). Ideally the oxidizer and fuel should be in a ratio of around 65:35. In order to account for the water in the corn syrup, the ingredients should be in the following amounts:
62% KNO3
17% Sucrose
21% Fructose
Sugar and Corn syrup can be purchased at your local grocery. KNO3 can be found in commercial stump remover which can be purchased at most hardware stores or online.
Weigh out the ingredients on the scale.

R-Candy won't ignite by grinding it. I think the comment below about fingers being blown off is probably referring to Potassium Perchlorate flash powder which you'd have to be a moron to grind! <br>Unless confined, R-Candy will just burn (rapidly). This stuff is popular because it's relative cheap, safe and easy to make and can be cast when hot meaning that you don't have to grind it.<br>NOTE: If you don't make the particle size small enough or don't compress the granules enough into the motor casing then your rocket could cato (catastrophically fail) on ignition because gaps between the particles allow a much larger surface area to deflagrate (burn). Casting the propellant avoids this. <br>When the particle size of this stuff is is about 3mm it is referred to as R-Explosive! It's a low explosive which will still just burn quickly in open air but can be extremely dangerous when confined. Bottom line: cast it when it's hot and avoid injury.
<p>Preach this stuff</p>
<p>Judging by the sudden rush of rocket-fuel instructables, it looks like a class are all posting their work. Could you do me a favour, and ask the class teacher or group leader to contact me?</p><p>They can reply to any of my comments on these projects, but it would probably be better if they send me a PM.</p>
<p>Aside from the legal issues (this project would get you locked up in the UK), the recommended method is highly dangerous!</p><p>Grinding the finished fuel and using a power drill to form the combustion chamber could both very easily generate enough heat to ignite the fuel. I know of at least one case where somebody lost fingerx whilst grinding a mixture like this in a pestle and mortad</p>