Core concept
Treat the launch as an observation experiment: record actual release, stability, module/fin retention, and post-recovery condition.
IED Unit 3 • Lesson 3.14
Compressed-Air Rocket Flight Test & Post-Flight Review
Focus question: What can a controlled flight test reveal about the quality of an engineered assembly?
Your lesson guide
Objective
Observe the rocket as a complete assembly under real flight loading. Evaluate whether the rocket remained stable and intact. Inspect the rocket after landing for assembly or manufacturing failures.
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 3.14 Learning Studio
Understand the engineering, follow the examples, and document the result
Today's process
The instructor operates the pressurized launcher; students observe from safe locations; after the teacher clears recovery, photograph condition, inspect modules, and propose one evidence-based design improvement.
Worked example
If visible yaw occurs and one fin is loose on recovery, suggest checking fin alignment/retention—but do not claim a measured aerodynamic cause without data.
01 / Visual lesson
Compressed-Air Rocket Flight Test
Treat the launch as an observation experiment: record actual release, stability, module/fin retention, and post-recovery condition. This diagram is explanatory rather than a tested or dimensioned engineering artifact.
02 / Watch and research
Engineering tutorials and further learning
Fusion workflow review
Apply the useful modeling and assembly techniques to this lesson; sample parts in the tutorial may differ from your rocket.
Open the video on YouTube ↗Expert technical references
Read these Autodesk or NASA learning resources for the relevant design or aerospace fundamentals.
Primary technical reference ↗Additional learning reference ↗Learn independently: read, pause, apply the idea, then record the actual evidence.
03 / Follow the procedure
Guided engineering workflow
Steps for your project
- The instructor operates the pressurized launcher
- students observe from safe locations
- after the teacher clears recovery, photograph condition, inspect modules, and propose one evidence-based design improvement.
What your result means
If visible yaw occurs and one fin is loose on recovery, suggest checking fin alignment/retention—but do not claim a measured aerodynamic cause without data.
Example statements are not actual flight observations or substitute measurements. Use the original requirements and instructor approval.
04 / Independent checks
Review your evidence before submitting
Concept explorer: total finished mass
Not a measurement or GO authorization. For 3.14, only actual flight observations count.
Self-check questions
Who operates the compressed-air launcher?
The instructor under established safety procedures.
Can students guess speed or altitude?
No. Report only actual measurements or qualitative observations.
The existing “What to Submit” section below provides exact filenames and required proof.
Lesson Overview
What You Are Learning
Learning Targets
- Observe the rocket as a complete assembly under real flight loading.
- Evaluate whether the rocket remained stable and intact.
- Inspect the rocket after landing for assembly or manufacturing failures.
- Use flight evidence to identify one future design improvement.
Unit 3 Progression
The unit ends with the assembly doing what it was designed to do: leave the launch tube as a complete physical system and provide evidence for the next iteration.
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.
Instructor-controlled compressed-air test
The instructor operates and pressurizes the PVC launcher using established class procedures and fixed test settings. Students remain in the designated observation area and do not alter the launcher or pressure system.
Assignment
Flight-Test and Inspect the Final Rocket
The flight test is a qualification event, not a maximum-distance contest. The goal is to determine whether the modular assembly performs safely and remains intact.
Step-by-Step Instructions
- Complete the final preflight confirmation: Verify the Lesson 3.13 approval is still valid and no part has changed since inspection.
- Prepare the observation record: Be ready to record launch release, flight stability, assembly integrity, and landing condition.
- Turn the rocket over for launch: The instructor installs and launches the rocket using the established compressed-air apparatus and fixed class test settings.
- Observe launch release: Record whether the rocket leaves the PVC tube cleanly without binding or shedding parts.
- Observe flight behavior: Record whether the flight is generally stable or shows immediate tumble, severe yaw, or another obvious instability.
- Observe assembly integrity: Record whether major modules and fins remain attached throughout flight and landing.
- Recover and inspect: After the instructor indicates the area is safe, inspect the rocket for cracks, loosened interfaces, fin damage, or deformation.
- Disassemble the rocket: Verify the serviceable modules can still be separated after the test.
- Compare with the CAD: Identify whether any post-flight issue originated from geometry, interface design, material use, or manufacturing.
- Write one next-iteration recommendation: State the single most important change you would make before a second design cycle.
Before You Submit
- The rocket had instructor flight approval.
- Flight observations are recorded rather than guessed afterward.
- Post-flight damage is documented before repair.
- Assembly integrity and serviceability are evaluated.
- The final recommendation is tied to actual flight evidence.
Submission
What to Submit
Submit only the following assignment-specific deliverables in Google Classroom:
Grading: Engineering documentation and evidence-based analysis matter more than maximum flight distance.
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: Flight-test and post-flight report (one PDF): LastName_FirstName_3_14_FlightReport.pdf recording launch release (clean/binding), observed flight stability, whether fins and modules remained attached, landing condition, and any observed failure. Do not guess missing observations. Post-flight photos (inside the PDF): overall rocket after recovery plus close-ups of any damage or loosened interfaces; note 'no visible damage' if appropriate.
A PDF download is not a submission. Review it, then upload it and any required attachments through your classroom assignment system.