Lesson 4: Assembly and Structural Integrity (Venting)

How can trapped air inside a pipe act as an "accidental" float?

Why do we avoid using glue in the prototyping phase?

Venting/Flood Holes: Small holes drilled into the frame to allow air to escape and water to enter.

Friction Fit: A fastening between two parts which is achieved by friction after the parts are pushed together.

Structural Rigidity: The ability of a structure to resist deformation under load.

NGSS HS-ETS1-2: Design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems.

Description: Students assemble the frame and use a power drill to create flood holes. They perform a "twist test" to ensure the frame won't fall apart under motor torque.

Purpose: Finalization of the physical chassis.

DOK Level: Level 4 (Extended Thinking). This lesson moves into DOK 4 as students must evaluate their physical build against their original 2.1 stability theory. If the frame feels flimsy or crooked, they must "synthesize" a fix by modifying the design on the fly—an example of iterative engineering.

In this course, we recognize that students enter the lab with varying levels of technical experience. Our differentiation strategy employs a 'Scaffolded Autonomy' approach. We provide structured, step-by-step guidance for foundational concepts while offering open-ended, 'Design Challenge' extensions for advanced learners. By utilizing peer-mentorship models, diverse instructional media (visual, tactile, and digital), and flexible project pathways, we ensure every student can move from consumer to creator at their own pace.

The "Dry-Fit Inspection": A formal sign-off. The frame must stand level on a flat table and have visible vent holes in the designated "bottom" rails.