Final Engineering Challenge

A supply package needs to travel across a dangerous area, avoid damage, and arrive safely. Your job is to design a system that moves or protects the package across the hazard using only the materials you are given. This is your final challenge - it pulls together everything from the whole course.

Real rescue and delivery missions face exactly this problem: get something valuable across a dangerous place without damaging it. Engineers combine structures, motion, and protection to pull it off.

• Search-and-rescue teams
• |Cargo drones
• |Aid drops
• |Cable cars
• |Delivery systems

System

Several parts working together toward one goal, like a structure plus a moving part.

Combining ideas

Using more than one engineering idea at once - strength, motion, and balance in a single design.

Constraints and tradeoffs

Meeting all the rules of a challenge while choosing what to make best.

Iteration

Testing and improving your design again and again until it meets the goal.

• Paper
• Cardboard
• Cups
• String
• Tape
• Straws
• Popsicle sticks
• Rubber bands
• Index cards
• Paper clips
• A small object to use as the package

Pick one direction. There is no single right answer - each path can complete the mission if you design it well.

• A bridge to carry the package across a gap
• A zipline carrier that slides the package across
• A parachute drop system that lowers it gently
• A crane or grabber that lifts and places it
• A protective package that survives the trip
• A small vehicle or sled that ferries it across

Engineers plan before they build. Work through these before you pick up any tape.

1. 1Draw your idea before you build it. A rough sketch is fine.
2. 2Label the strongest part of your design, and the part you are least sure about.
3. 3Predict what might fail first when you test it.
4. 4Decide which material goes where, and why that material fits that job.

These are guides, not rules. Two students can follow them and build very different designs - that is the point.

1. 1

   Pick one solution path and sketch it before you build.

2. 2

   Build a simple first version - a prototype - that you can actually test, not a perfect final model.

3. 3

   Set up your hazard zone and decide how you will run the same test each time.

4. 4

   Make the package easy to load and, if your design moves, easy to release at the end.

5. 5

   Leave room to change things - you will test, find what fails, and improve.

A design is only finished when it passes a fair test. Run each test the same way every time.

• Crossing test

  Run the mission from start to finish across the hazard zone.

  Measure: Did the package reach the other side? (yes / no)

• Safe-arrival test

  Check the package at the end of each run.

  Measure: Undamaged and upright, or dropped/damaged?

• Reliability test

  Run the mission three times without rebuilding from scratch.

  Measure: How many of the three runs succeed

Write down what happens each time you test. Your numbers tell you what to improve. Print this page or copy the table into your notebook.

Your first version is a prototype, not the final answer. Change one thing based on what failed, then test again.

• If the package fell or got damaged, add protection or slow it down at the end of the trip.
• If a structure sagged or broke, add a triangle brace or a support where it failed.
• If a moving part stuck or slipped, adjust the tension, the pivot, or the slope.
• Change one thing, run the same test again, and see if it helped.
• Watch the tradeoffs - a heavier, stronger design may move more slowly.

1. 1Which ideas from earlier lessons did you combine, and how did they work together?
2. 2What failed on your first run, and how did you use that to improve the design?
3. 3Which constraint or tradeoff shaped your design the most?
4. 4If you had another week, what is the first thing you would redesign?

• Deliver two packages in a single run without adding much weight.
• Make the crossing work over a longer or more dangerous hazard zone.
• Add a way to lower the package gently at the end instead of dropping it.

Share your finished design with the group. Be ready to answer:

1. 1What problem did you solve?
2. 2What did you build?
3. 3What failed at first?
4. 4What did you improve?
5. 5Which earlier lesson helped you most?
6. 6What would you change with more time?

Running this lesson? The parent & teacher guide has setup, materials prep, safety notes, common failure points, and questions to ask.