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Small amateur

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Rocket candy can be broken down into three major groups of components: fuels , oxidizers , and additives. The fuel is the substance that burns, releasing rapidly expanding gases that provide thrust as they exit the nozzle.

The oxidizer provides oxygen, which is required for the burning process. The additives can be catalysts, to speed up or make the burning more efficient.

However, some additives are more aesthetic, and can add sparks and flames to liftoff, or add smoke for ease of following the rocket in the air.

Many different sugars can be used as the fuel for rocket candy, including glucose, fructose, and sucrose; however, sucrose is the most common. Sorbitol , a sugar alcohol commonly used as a sweetener in food, produces a less brittle propellant with a slower burn rate.

This reduces the risk of cracking propellant grains. Sugars that only have alcohol groups, like sorbitol, are much less prone to this decomposition.

Some other commonly used sugars include erythritol , xylitol , lactitol , maltitol , or mannitol. The oxidizer most often used in the preparation of sugar motors is potassium nitrate KNO 3.

Other oxidizers can be used as well, such as sodium and calcium nitrates as well as mixtures of sodium and potassium nitrate.

Other rarely used oxidizers are ammonium and potassium perchlorate. Two main issues need to be addressed with respect to the oxidizer if one is using potassium nitrate.

The most important issue is the purity of the material. If a purchased material does not perform satisfactorily it may be necessary to recrystallize the KNO 3.

The second important issue with respect to the oxidizer portion of a propellant is its particle size. Rock-tumblers can also be used to mill into a fine grained well mixed powder.

Additives are often added to rocket propellants to modify their burn properties. Such additives may be used to increase or decrease the burn rate of the propellant.

Some are used to alter the color of the flame or smoke produced. They can also be used to modify a certain physical property of the propellant itself, such as plasticizers or surfactants to facilitate the casting of the formulation.

There are many types of experimental additives; the ones listed here are only the most commonly used. Metal oxides have been found to increase the burn rate of sugar propellants.

Such additives have been found to function best at levels from 1 to 5 percent. Red iron oxide is used most often as it is somewhat easier to obtain than the yellow , brown, or black versions.

Brown iron oxide exhibits unusual burn rate acceleration properties under pressure. Carbon in the form of charcoal, carbon black, graphite, etc.

Most often, however, a small amount of carbon is used as an opacifier, making a visible smoke trail. The carbon acts as a heat sink, keeping a portion of the heat of combustion located in the propellant rather than having it transferred quickly to the motor casing.

If metallic fuels such as aluminum or magnesium are used in a sugar formulation, a danger exists if traces of acids are found in the oxidizer. Acidic materials can react readily with the metal, producing hydrogen and heat, a dangerous combination.

The addition of weak bases helps to neutralize these acidic materials, greatly reducing their danger.

Surfactants are used to reduce the melting viscosity of sugar propellants. For example, propylene glycol helps reduce the melt viscosity of sucrose based propellants.

A typical sugar propellant formulation is typically prepared in a oxidizer to fuel ratio weight ratio.

However, this formulation is slightly fuel rich. There are many different possible formulations that will allow for flight in amateur rocketry.

There are a number of different methods for preparing a sugar-based rocket propellant. These methods include dry compression, dry heating, and dissolving and heating.

The latter two methods involve heating the propellant. In dry compression, the sugar and potassium nitrate are individually ground as finely as possible, and then mixed in a ball mill or tumbler to ensure uniform mixing of the components.

This mixture is then compressed into the motor tube, similar to a method for loading black powder. There is a significant chance for self-ignition while mixing, which could lead to serious injury.

Another, more common, and safer method of preparing a sugar-based rocket propellant is dry heating. First, the potassium nitrate is ground or milled to a fine powder, and then thoroughly mixed with powdered sugar which is then heated.

The melting process must be performed using a heat spreader , so as to avoid creating autoignition hot-spots. James Yawn advocates for the dissolving and heating method.

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