Thames Kosmos Thames & Kosmos WindBots: 6-in-1 Wind-Powered Machine Kit Best

Build six awesome bots that move without any batteries or electricity. The secret behind these fascinating machines is one of the oldest power sources in the world: wind! A full-color manual guides you in assembling six models one at a time from over 130 pieces. 

Build a big-wheel tricycle, quadruped, soaring machine, drilling monster, walking robot, and even a wind-powered yacht. To make them all go, the kit also includes the pieces to build a hand-powered wind generator. As you build and experiment, you will learn about how gears transmit power and torque. Also learn about wind as a power-generating technology — past, present, and future.

• Easy, snap-together assembly requires no glue
• Step-by-step, illustrated instructions
• 6-in-1 engineering kit: build six wind-powered models and a handheld wind generator. Start cranking the generator and watch them go!
• Learn about gear ratios and wind-power technology.
• No batteries or electricity required