Propeller Hat : 4 Steps - Instructables

DIY 4 Blades 56mm Motor Propeller (Blue)

Propeller Hat : 4 Steps - Instructables

How to Make a DIY Toy Car: 4 Fun & Easy Tutorials

BlueROV2 - Affordable and Capable Underwater ROV

40 Easy DIY Wood Toys to Make for Kids

10 Hands-On Science and Math Activities

How do propellers work? - Explain that Stuff

Raspberry Pi Drone: How to Build Your Own

Make Inspector Gadget's Helicopter Hat! #electronichalloween

Instructables: Instructions in how to construct things

Sew a Propellor-Equipped Beanie : 9 Steps (with Pictures

Make a Wooden Propeller : 23 Steps (with Pictures) - Instructables