30 models are propelled by a hydro pneumatic motor–by water jet and water inside recycling!
Build 15 vehicles propelled by a hydropneumatic motor.
Two different systems:
* 5 models with..
● The hydro power in this set utilizes the principles of air and water pressure so that after kids c..
●5 different models built easily one after another – windmill, electric car, airplane, helicopter an..
● Build gravity-defying Gyro Robots without batteries but rip cord!
● Explore the magic of Gyrosc..
● With detailed assembly instructions, the manual also includes principles and app..