Estes E/F Engine 25" Tall Honest John Model Rocket

thingiverse

Print Fin Can upside down with fins up using a brim. Body and nose cone require a brim also.The engine components consist of a threaded tube that the engine slides into...ejection charge end first. A threaded cap is screwed onto the end to contain the engine. There are two spacer donuts that need to be glued to the inside of the fin can. The one with the threads is glued up inside about 74mm for E engine installation, from its bottom edge to the bottom of the fin can. To do this, assemble the engine tube with an engine installed. Slide the donut spacer without threads over the engine tube and let it rest on the screw on engine cap. Screw the threaded donut onto the top of the engine tube and insert this whole assembly into the fin can. It is easier to apply super glue from the top of the fin can down inside and push the threaded donut into it from the bottom with the whole assembly.NOTE***Before you glue the engine assembly spacers in place, screw a small eye bolt into the small hole on the threaded donut spacer. Hook either a 18" or 36" steel fishing leader to it, then glue the spacer with the fishing leader eyebolt side facing the top of the rocket. This is for attaching the shock cord rubber band. Finish by gluing the other donut spacer flush with the bottom of the fin can. You can now screw the engine tube up inside the rocket and secure the engine with the cap at the bottom. These parts are probably consumable due to heat and you will have to print another engine tube and cap.Screw a small eye bolt into the bottom of the nose cone to attach the parachute and also a rubber band shock cord. Attach the other end of the shock cord to the fishing leader that comes from the fin can...up inside the body and out the top. Make sure to glue the fin can to the body. Might need to sand the nosecone a bit so that it slides easily on and off the body tube.