Engineering concept
Plan three or more individually printed major modules joined by two removable interfaces, with laser-cut fins and a sliding fit over the 21.34 mm OD launcher tube.
IED Unit 3 • Lesson 3.6
Rocket Design Challenge & Concept Development
Focus question: How can an engineer turn a flight requirement into a modular assembly that can be manufactured, serviced, and tested?
Your lesson guide
Objective
Translate the challenge constraints into an assembly architecture. Plan at least three major printed modules and two removable interfaces. Select a connection strategy without being given one required solution.
Materials
For the online work: a browser and your engineering notebook. Follow the activity’s materials list for any physical build, and get teacher approval before using equipment.
Plan your time
Suggested work block: 45–60 minutes. Physical builds and projects may span several classes; follow your teacher’s schedule.
IED Unit 3 • Lesson 3.6 • Learning Studio
Learn the concepts before completing the assignment
Today's engineering work
Sketch nose, hollow body, lower/fin module, both removable couplers, launch bore and 3 or 4 fins; identify 1/8 in acrylic or plywood and support-free print orientations.
Worked example
Fin angles: 3 equal fins → 120° between fins; 4 equal fins → 90°. A rocket bore matching 21.34 mm exactly has zero nominal tube clearance.
01 / Illustrated concept
Modular Rocket Design Concept
What the diagram means: Plan three or more individually printed major modules joined by two removable interfaces, with laser-cut fins and a sliding fit over the 21.34 mm OD launcher tube. The example values illustrate the principle and do not replace actual teacher-assigned dimensions.
02 / Watch and research
Instructional video and technical resources
Fusion component assembly foundations
Use the relevant modeling or assembly technique; the demonstration project may differ from the rocket assignment.
Watch directly on YouTube ↗Expert references
Use these official Autodesk or NASA guides when the video alone does not explain the underlying workflow.
Primary technical reference ↗Additional learning resource ↗Self-study: identify a key technique, pause the tutorial, apply the operation and verify the result before continuing.
03 / Step-by-step guide
From theory to your own project
Guided task sequence
- Sketch nose, hollow body, lower/fin module, both removable couplers, launch bore and 3 or 4 fins
- identify 1/8 in acrylic or plywood and support-free print orientations.
Worked example and verification
Fin angles: 3 equal fins → 120° between fins; 4 equal fins → 90°. A rocket bore matching 21.34 mm exactly has zero nominal tube clearance.
Important: Do not substitute illustrative numbers for actual CAD dimensions, real measurements or instructor approvals.
04 / Independent practice
Explore one key parameter
Interactive concept explorer
Illustrative values only; not a completed engineering inspection or teacher authorization.
Check your reasoning
Can the main modules be permanently glued?
No. Both major removable interfaces must remain serviceable.
What is the launcher reference diameter?
21.34 mm outside diameter for the 1/2 in PVC tube.
Use the lesson's original assignment and “What to Submit” sections below for exact deliverable requirements.
Unit 3 Learning Studio • Lesson 3.6
Understand, visualize, and apply the concept
The engineering idea
A modular rocket has at least three separately printed main modules and two removable interfaces. Its fins are laser-cut, not fused into one printed shell.
Apply it to this project
360° ÷ 3 = 120°; 360° ÷ 4 = 90°. Nominal bore size equal to launcher OD has no modeled sliding clearance.
What successful work shows
- Reference the 21.34 mm OD launcher tube.
- Plan a nose, body and lower/fin section.
- Use 3 fins at 120° or 4 fins at 90°.
01 / Learning diagram
Rocket Design Challenge & Concept Development — visual walkthrough
Interpret the illustration: A modular rocket has at least three separately printed main modules and two removable interfaces. Its fins are laser-cut, not fused into one printed shell. Treat the diagram as an explanatory model, not as a dimensioned Fusion part or an approved fabrication file.
02 / Watch and learn
Video demonstration and technical references
Organizing components in Fusion
Pause the video at relevant commands or principles and apply them to this lesson. The tutorial's sample design may differ from your teacher-supplied parts and rocket specifications.
Watch directly on YouTube ↗Read the expert explanations
Official Autodesk Fusion or NASA guidance provides further diagrams and step-by-step instruction.
Primary technical reference — www1.grc.nasa.gov ↗Additional worked reference — www1.grc.nasa.gov ↗Self-study routine: read the explanation, identify a concrete command or concept, do that step in your own file, and capture evidence before proceeding.
03 / Practical walkthrough
Follow the lesson workflow
Guided sequence from the assignment
- 1. Define the major modules: Plan at least three printed modules: a lower launch/fin module, a main body module, and a nose/upper module. You may use additional printed couplers or retainers.
- 2. Plan two removable interfaces: Decide how the nose/upper module connects to the body and how the body connects to the lower module. Major printed sections may not be permanently glued together.
- 3. Select a connection concept: Choose an approved method such as a keyed coupler, twist-lock/bayonet, fasteners/inserts, snap-fit feature, or another serviceable connection.
- 4. Plan the launch interface: Add the 1/2 in PVC launcher as a 21.34 mm OD reference and identify the rocket region that will slide over it.
- 5. Choose 3 or 4 fins: Plan identical fins at 120° or 90° spacing. Identify whether you will use 1/8 in acrylic or plywood.
- 6. Design the fin locating strategy: Show how slots, tabs, pockets, or another repeatable feature will control fin position and angle.
Worked example & mistakes to avoid
360° ÷ 3 = 120°; 360° ÷ 4 = 90°. Nominal bore size equal to launcher OD has no modeled sliding clearance.
Check your evidence: Use 3 fins at 120° or 4 fins at 90°. Verify with the actual CAD geometry, teacher-assigned parameters or physical observations—not just with the example shown here.
When stuck: return to the lesson's diagram, review the relevant section of the video, and compare your setup with the specific checklist in the assignment below.
04 / Interactive learning and review
Investigate and explain the key requirement
Concept explorer
Change a sample parameter, then explain what it means. These are illustrative values, not measured student results or approved settings.
Check your understanding
Can you glue the three main sections permanently?
No. The main printed modules must be serviceable and detachable.
What materials are permitted for fins?
⅛-inch acrylic or plywood.
Before you submit
Identify the actual Fusion file, screenshot, drawing, PDF, video or physical measurement requested below. Save original evidence, not simply a screenshot of this webpage.
Lesson Overview
What You Are Learning
Learning Targets
- Translate the challenge constraints into an assembly architecture.
- Plan at least three major printed modules and two removable interfaces.
- Select a connection strategy without being given one required solution.
- Plan the 21.34 mm launcher interface and laser-cut fin system as real assembly interfaces.
Unit 3 Progression
Lessons 3.1–3.5 provided controlled assembly practice. The rest of Unit 3 applies those skills to a student-designed compressed-air rocket that will be physically flight-tested.
ComponentsAssembleVerifyFabricateReviseFlight Test
Compressed-Air Rocket Challenge
Project Requirements
These requirements apply throughout Lessons 3.6–3.14.
1/2 in PVC Reference Tube
- The launcher tube outside diameter is 0.840 in (21.34 mm).
- Model the launch tube as a separate grounded Fusion reference component.
- You choose the rocket's internal launch clearance, but the finished rocket must slide freely over the actual PVC tube without binding.
- Before choosing the rocket's internal bore dimension, measure the actual unpressurized classroom launch tube. The 0.840 in (21.34 mm) diameter is the nominal outside-diameter reference, not the target bore size.
- The launcher itself is teacher equipment and is not modified as part of this project.
Modular 3D-Printed Rocket
- The structural rocket body is 3D printed in classroom-approved filament.
- Use at least 3 major printed modules: a lower launch/fin module, a main body module, and a nose/upper module.
- The rocket must have at least 2 removable printed-to-printed interfaces.
- Major printed modules must be disassembled without damaging the parts; permanent adhesive is not allowed between major modules.
Connection Method
- You choose how major modules connect.
- Examples include keyed/slip couplers with retention, twist-lock/bayonet features, screws/inserts, snap-fit features, or another approved method.
- The connection must keep the rocket aligned and secure during handling and flight-readiness checks.
- If a connection uses hardware or a tool, it must still be serviceable without damaging the printed parts.
Laser-Cut Fin Assembly
- Use 3 or 4 identical fins, equally spaced at 120° or 90°.
- Fins are laser-cut from 1/8 in acrylic or plywood.
- Use 3.175 mm as the nominal CAD thickness, then measure the actual stock and use that measurement for the final fin interface.
- Fins must use a repeatable locating feature such as slots, tabs, keyed pockets, or another approved feature. Surface gluing alone is not an acceptable locating method.
- Adhesive may be used to retain the fins after the fit/alignment check is approved.
Lightweight by Design
- Primary body walls should generally be 1.2–2.0 mm thick; 1.6 mm is the recommended target.
- Geometry thicker than 2.5 mm should be limited to local interfaces, couplers, fin mounts, fastener features, or other justified reinforcement.
- Total predicted 3D-printed material should be 100 g or less.
- The finished rocket should have a total mass of 125 g or less before the flight-readiness review.
Build for the Classroom Process
- Every printed component must fit the classroom printer build volume and be designed to print without support material.
- No support material may be required inside the launch bore or any mating interface.
- The nose must be rounded/blunt, and exposed fin corners/edges must be made safe before flight.
- Only the instructor operates, pressurizes, or changes settings on the compressed-air launcher.
Assignment
Plan the Modular Rocket Assembly
Create the architecture for a rocket that is fully 3D printed except for laser-cut fins and that can be disassembled after manufacturing.
Step-by-Step Instructions
- Define the major modules: Plan at least three printed modules: a lower launch/fin module, a main body module, and a nose/upper module. You may use additional printed couplers or retainers.
- Plan two removable interfaces: Decide how the nose/upper module connects to the body and how the body connects to the lower module. Major printed sections may not be permanently glued together.
- Select a connection concept: Choose an approved method such as a keyed coupler, twist-lock/bayonet, fasteners/inserts, snap-fit feature, or another serviceable connection.
- Plan the launch interface: Add the 1/2 in PVC launcher as a 21.34 mm OD reference and identify the rocket region that will slide over it.
- Choose 3 or 4 fins: Plan identical fins at 120° or 90° spacing. Identify whether you will use 1/8 in acrylic or plywood.
- Design the fin locating strategy: Show how slots, tabs, pockets, or another repeatable feature will control fin position and angle.
- Plan lightweight construction: Use approximately 1.6 mm body walls and identify only the locations that need local reinforcement.
- Estimate manufacturability: Confirm each printed module can fit the classroom printer and can be printed without support material.
- Sketch the assembly: Create an annotated concept showing the modules, connections, fins, and launcher interface.
- Get approval: Do not begin final CAD until the architecture has been approved.
Before You Submit
- At least three major printed modules are shown.
- At least two removable interfaces are planned.
- The 21.34 mm launch tube interface is identified.
- The fin count, material, spacing, and locating feature are defined.
- Wall thickness and reinforcement are reasonable.
- The concept can be manufactured without support material.
Submission
What to Submit
Submit only the following assignment-specific deliverables in Google Classroom:
Resources
Lesson Resources
IED Unit 3
Return to the Unit 3 lesson map and project sequence.
Introduction to Engineering Design
Return to the IED course hub.
Build your lesson report
Checkpoint: is your evidence ready?
- Check calculations, units, labels, and measurements against the activity requirements.
- Record what actually happened, including unexpected results.
- Explain what you changed and why; attach required drawings, photos, CAD, or code in your classroom assignment.
Submit only the following assignment-specific deliverables in Google Classroom: Annotated rocket concept (one PDF): LastName_FirstName_3_6_Concept.pdf. Show front and isometric sketches labeling the nose/upper module, body, lower/fin module, both removable interfaces, 3 or 4 fins, and launch-tube opening. Connection and manufacturing plan (included in same PDF): identify the connection method for both detachable interfaces; name the fin material (1/8 in acrylic or plywood), printed module list, and a brief plan for locating/retaining fins.
A PDF download is not a submission. Review it, then upload it and any required attachments through your classroom assignment system.