December 21, 2025
Description
*(legal disclaimer at bottom)
Safety: If undertaken please make sure it is legal in your location and fly model rockets outside and away from people, property, and living things, the methods in this guide can be dangerous and might not be safe, please follow instruction from professionals and your local rocket or pyrotechnic club.
3d printed model rocket based of one of Estes' models with some modifications. Will fly approximately 1000ft or 305m)
Make the nozzle: Pour bentonite clay into the rocket liner and ram it with the 3d printed ramming rod until approximately 10mm thick (less can be used such that more fuel can be fit inside the liner but this will increase the chance of the nozzle failing) (the opposite would be true for a thicker nozzle).
Fuelling the rocket: Fill the rocket liner with either black powder or sugar mix and ram it with the printable ramming rod fairly hard, do this incrementally leaving space at the top of the liner equal to that of the nozzle you made previously.
Make the top plug: Pour bentonite clay into the rocket liner and compact it with the printable ramming rod until it is the same thickness as the nozzle you made earlier.
Fuel and Nozzle geometry: If you have used a sugar fuel mix your rocket will need a core (hole in the solid fuel to increase surface area) IF YOU HAVE USED BLACK POWDER YOU CAN USE USE A CORE OR SKIP DRILLING THE NOZZLE THIS FOR A SLIGHTLY SLOWER BUT EASIER ROCKET, this rocket is able to fly with a simple 3mm hole drilled through the entirety of the fuel grain AND the nozzle DRILLING THE NOZZLE AND FUEL GRAIN IS A DANGEROUS AND INCORRECT PROCESS THAT CAN CAUSE THE ROCKET TO LIGHT OR EXPLODE PREMATURELY DUE TO FRICTION IDEALLY THE ROCKET SHOULD BE FORMED AND COMPRESSED WITH PROFESSIONAL TOOLING (you can change the size of each the fuel core or the nozzle core to change the propulsion characteristics) BUT BE AWARE MISMATCH OF THE CORE AND NOZZLE SIZES CAN CAUSE EXPLOSION OF THE ROCKET RESULTING IN INJURY, DEATH, OR DAMAGE TO YOURSELF AND OTHERS, FUTHERMORE FUEL THAT BURNS FASTER THAT DOES NOT MATCH THE CORE OR NOZZLE SIZE CAN ALSO CAUSE THIS.
Launch: THE ROCKET MUST BE LAUNCHED FROM A 3MM ROD OF AT LEAST 500MM, this ensures the rocket has the sufficient speed for the fins to stabilize the rocket so it only goes upward and not sideways into someone's house.
Pick the fuel for the rocket: Sugar, or Black Powder:
Sugar fuel: 70:30 mix of KNO3 (potassium nitrate) : Sugar of any sort (finer the better)
Black powder: 75:15:10 mix of KNO3 (potassium nitrate : charcoal : sulphur
2. GRIND FUEL COMPONENTS SEPERATELY to a flour-like consistency.
3. Mix a sufficient amount of fuel: 10g or so is fine.
4. return to step one of 'How to make t he rocket motor section.
The information, instructions, designs, descriptions, and guidance provided herein regarding the design, construction, modification, or use of model rockets, rocket motors, or related equipment (collectively, the “Materials”) are provided for informational and educational purposes only and are based solely on personal experience and opinion.
The Materials are not guaranteed to be accurate, complete, safe, current, or suitable for any particular purpose. No representation or warranty, express or implied, is made regarding the correctness, reliability, performance, safety, or legality of the Materials.
Model rocketry and the design and use of rocket motors are inherently dangerous activities that involve risks including, but not limited to, fire, explosion, property damage, serious injury, or death. By using or relying upon the Materials, you acknowledge and agree that you assume all risks, whether known or unknown, associated with such activities.
To the fullest extent permitted by law, the author disclaims all liability for any loss, damage, injury, or harm of any kind, including but not limited to personal injury, death, property damage, or consequential damages, arising out of or related to the correct or incorrect use, misuse, interpretation, or reliance upon the Materials, or any activities inspired by them.
The author shall not be liable for any direct, indirect, incidental, special, punitive, or consequential damages, regardless of whether such liability arises in contract, tort, negligence, strict liability, or otherwise, even if advised of the possibility of such damages.
Users are solely responsible for ensuring compliance with all applicable laws, regulations, safety codes, manufacturer instructions, and organizational guidelines (including those of rocketry associations and governing bodies) and for obtaining appropriate training, supervision, and safety equipment.
If you do not agree to these terms, you must not use or rely upon the Materials.
If not using your own mix motors below are recommended by Estes.
RECOMMENDED ENGINES: 1/4A3-3T, 1/2A3-2T, 1/2A3-4T, A3-2T, A3-4T, A3-6T, A10-3TPROJECTED ALTITUDE: APPROX 850 ft. (259 m) on a A10-3T
License:
Creative Commons — Attribution — NoDerivatives