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Ripcord Spinner Launcher

Build a ripcord-powered spinning disc launcher. Pull the cord, watch it fly — angular momentum in action.

👶 Ages 8–12 ⏱ 60 min Medium 💰 ~$50
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What you'll make

Build a ripcord-powered spinning disc launcher. Pull the cord, watch it fly — angular momentum in action.

What your kid learns

Angular momentum, gyroscopic stability, friction, energy transfer

Supervision

Active supervision recommended

Materials List

Hero Item
Mini Rotary Tool (Dremel-style) $35
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  • Bearings & Spinner Blanks $8 View
  • Notched Launch Rod + String $5 View
  • Plastic Discs $4 View
  • Small Weights $3 View

Tools Needed

You probably own

  • None — all tools listed below

Recommended buy

⚠ Safety Note

Spinning parts can fly off — always wear safety glasses. Test launches in an open area away from faces. Adult supervision required.

What You’ll Build

A launcher that uses a pull-cord mechanism to spin a disc at high speed, then releases it to fly through the air. Think beyblade launcher meets frisbee.

Step-by-Step Instructions

Step 1: Shape the Disc

Use the rotary tool to smooth the edges of a plastic disc blank. Sand any rough spots. Optionally cut notches for aerodynamics.

Step 2: Add Weight

Glue small weights around the rim of the disc. This increases angular momentum — the disc will spin longer and fly straighter.

Step 3: Build the Launcher Body

Construct a handle from a dowel or craft sticks. Drill or cut a center channel for the launch rod.

Step 4: Make the Ripcord Mechanism

Wrap string around the notched launch rod. When pulled, the string spins the rod. The rod engages the disc, spinning it up to speed.

Step 5: Assemble and Test

Insert the launch rod through the disc’s center bearing, place in the launcher body, and pull the cord sharply. The disc should spin off the rod and fly.

Step 6: Optimize

Try different disc weights, cord lengths, and pull speeds. Heavier rim = longer spin. Smoother bearing = less friction.

Make It Easier

  • Use a pre-made bearing and disc kit
  • Skip the rotary tool — use pre-shaped discs

Make It Harder

  • Design multi-stage launchers
  • Add LED lights to the disc for light-up spins
  • Build a target game and score points

What Your Kid Learns

Angular momentum, gyroscopic stability, friction, energy transfer