Step #1: Wind the motor casing and make the rocket nozzle.PrevNext
- Cut a sheet of kraft paper 4"×10". Place the 3/8" dowel on one of the 4" edges, then wrap the paper tightly around the dowel. As you roll, apply a very thin coat of white glue over one whole side of the paper. Roll the paper tube as tightly as possible. Remove the dowel and let the tube dry.
- After the glue dries, cut the paper tube into two 2"-long segments. Each tube will be suitable for a single-use motor casing.
- Reinsert the 3/8" dowel into the casing, leaving a 5/16" gap between the end of the tube and the dowel.
- Mix a small amount of nonshrinking water putty according to the label directions. Press the putty firmly into the end of the tube.
- Slowly remove the dowel and set the nozzle aside to dry. Repeat this process for the second motor.
Step #2: Prepare the rocket fuel.PrevNext
- CAUTION: Put on your safety glasses and leave them on for the rest of the project.
- Using the scale, measure 14 grams of potassium nitrate or saltpeter (KNO3) and 7 grams of sugar. This makes enough propellant for a single 2"-long rocket motor.
- Blend the ingredients by placing them into a tightly covered plastic container with a handful of large lead fishing weights or .50-caliber lead balls.
Then shake, shake, and shake some more. This
is a low-budget method of ball milling, a method that pyrotechnicians use to safely grind and mix
volatile chemicals. The longer you shake, the better the mixing and the better the rocket fuel.
- CAUTION: You’re shaking a container of rocket fuel, so use only lead balls, as other mixing media can cause sparks. Keep the cover on tight, and keep the fuel far from ignition sources.
- Now go outdoors to do the next part. Heat an electric skillet or a heavy pan on a carefully controlled electric hot plate to 285°F. (You might need an extension cord.)
- CAUTION:Do not use a gas burner or any open flame!
- Add the rocket-fuel mix to the pan. Stir continually with a hard plastic spatula or spoon. The mixture will soon melt into a peanut butter-like consistency. After a few more minutes of heating and stirring, it will melt into a smooth paste. Turn off the heat. The mixture will stay plastic and moldable just long enough for you to make the rocket motor.
Step #4: Core the rocket engine.PrevNext
- To produce enough thrust to lift your rocket into the air, you’ll need to make what rocketeers refer to as a core burner (as opposed to an end burner). This style of rocket motor has an open center, increasing the surface area over which the rocket fuel burns.
- While the fuel is still hot, insert the 6D nail into the nozzle and push it through the fuel, twisting it as you go, until the tip emerges on the other end. Carefully remove the nail by rotating it slowly so that the cylindrical hole remains intact.
Step #5: Seal the open end.PrevNext
- Fill the 3/8" gap at the open end of the motor with water putty.
- Now is a good time to make a nozzle hole with the 6D nail. If it dries before you get the chance, you can use a drill to make the hole instead.
Step #6: Attach balance sticks.PrevNext
- Glue a shish-kebab skewer or very narrow wooden dowel to the rocket casing, so it extends backward from the nozzle.
- The length depends on the weight of the rocket: choose a length such that the rocket body and stick will balance horizontally at a point 1" behind the nozzle.
Step #7: Build a launch platform.PrevNext
Make a simple launching platform by attaching an 8" length of ¾"- or 1"-diameter metal pipe to a scrap block of wood, using a floor flange and wood screws to support the pipe.
Step #8: Launch your sugar rocket!PrevNext
- CAUTION: Launch rockets only in an open area, far from houses, people, and items that could be damaged from a falling rocket body, a launch pad explosion, or other unexpected occurrences. If you’re in a place where you can’t or shouldn’t launch a bottle rocket, well, you can’t launch your sugar rocket either.
- Your rocket could reach altitudes of several hundred feet. Since a rocket’s trajectory is difficult to predict, you must launch only in appropriate areas in appropriate seasons (for example, flat, open, and free from easily ignitable materials). Check local laws and make sure you have the landowner’s permission to launch.
- Insert a 2"-long fuse directly into the rocket’s nozzle. If necessary, bend the end of the fuse before inserting it, so it will stay in the nozzle. Light the fuse and immediately retreat to a safe distance. Blastoff!