Unit 2: Robotic Frame

The Cartesian Coordinate System: Understanding how X, Y, and Z axes relate to the ROV’s movement (Surge, Sway, Heave, Roll, Pitch, and Yaw).Static vs. Dynamic Stability: Why the Center of Buoyancy must be above the Center of Gravity to prevent the robot from flipping.
Structural Drafting: How to read and create a technical schematic for a 3D object.
Material Properties: Why PVC is used (durability, buoyancy, ease of modification) and the importance of "flood holes" to allow air to escape.

Prototype Sketching: Create a 1:1 scale drawing of their proposed frame on graph paper, labeling every PVC fitting (elbows, tees, and pipes).

The "Dry Fit" Assembly: Cut PVC pipe to specific lengths using safety cutters and assemble the frame without glue to test for symmetry.

Drilling for Ballast: Use a power drill (under supervision) to create "vent holes" in the bottom PVC pipes so the frame sinks evenly.

Center of Gravity Test: Suspend the dry-fitted frame by a string to find its natural balance point.

• The Design Review (The "Pitch"): Before moving to the electrical unit, teams must present their "Dry Fit" frame to the "Lead Engineer" (the Teacher).

• The student must point out exactly where the Center of Gravity and Center of Buoyancy are expected to be.