Build 15 vehicles propelled by a hydropneumatic motor.
Two different systems:
* 5 models with a motor using pressurized water – Ideal for inside use since this system keeps the water in.
* 8 models with a reaction motor using pressurized water – Ideal for outside use since this system releases water.
Includes all parts required for assembly: water tanks, secure pump, nozzle, air-water power pack...
Full colour 48-page instruction sheet with explanation of concept and models.