Pass first. Then weigh in.
Structural qualification is pass/fail. Among the structures that pass every requirement, the lowest total assembled mass wins.
POE Unit 0 • Lesson 0.4
CubeSat Challenge: Define & Design
Focus question: How can we turn fixed competition constraints into several promising lightweight CubeSat concepts?
Challenge Rules
CubeSat Lightweight Structure Challenge
Every team works inside the same architecture and material limits. Your engineering advantage comes from how efficiently you use them.
- Maximum assembled envelope: 4 in × 4 in × 4 in, including hardware.
- Top and bottom: laser cut from the team’s single 4 in × 12 in × 1/8 in acrylic sheet.
- Sides: remain open; no side panels.
- Primary frame: 3D printed using the same teacher-selected filament material for every team.
- Assembly: M3 screws for all primary structural connections; structural glue is not permitted.
- Serviceability: the structure must be able to be disassembled and reassembled with normal hand tools.
- Competition: the lightest structure that passes every qualification requirement wins.
Lesson Targets
What You Will Be Able to Do
I can define the CubeSat design problem, distinguish criteria from constraints, and communicate three viable structural concepts.
CubeSat Design Brief + 3 annotated concept sketches
The design brief captures the fixed rules and each sketch clearly shows how the acrylic plates, printed frame, and M3 connections work together.
Activity Flow
How Today Advances the CubeSat
1. Launch the competition
Read the fixed architecture, material limits, and win condition.
2. Build the design brief
Separate criteria, constraints, and anticipated engineering challenges.
3. Generate three concepts
Sketch a strength-focused, lightweight-focused, and balanced frame concept.
Design Brief
What Is Fixed vs. What Can You Optimize?
| Fixed Constraint | Design Variable |
|---|---|
| 4 in × 4 in × 4 in maximum envelope | Corner-frame cross section and geometry |
| 1/8 in acrylic top and bottom | Plate shape and lightening cutouts |
| One 4 in × 12 in acrylic sheet | Material nesting and scrap reduction |
| 3D-printed primary frame | Ribs, gussets, wall thickness, hollow features |
| M3 structural assembly | Nut traps, inserts, screw access, connection geometry |
| Same filament for all teams | Print settings and print orientation |
Project Milestone
Today’s Required Deliverable
CubeSat Design Brief & Concept Sketches
Submit one team package containing:
- Problem statement and competition objective.
- Criteria and fixed constraints.
- Two or three predicted engineering challenges.
- Three annotated concept sketches: strength-focused, lightweight-focused, and balanced.
- Each sketch shows the acrylic top/base, printed corner frame, M3 connection locations, and approximate geometry.
- A preliminary preferred concept with a short justification. You are not locked into this choice yet.
Engineering Decision
Document the Reasoning
What did your team decide today?
What measurements, requirements, comparisons, calculations, or manufacturing information support that decision?
Why does that evidence make the decision appropriate for a lightweight structure that still has to qualify?
Resources
Lesson Resources
Lesson 0.4 — CubeSat Challenge: Define & Design
Download the class presentation used to introduce the CubeSat Lightweight Structure Challenge, project requirements, inspiration examples, design brief, and concept-sketch expectations.
CubeSat Unit 0 Overview
Review the complete challenge sequence, project rules, deliverables, and competition objective.
Principles of Engineering
Return to the POE hub for units, course resources, and certifications.