Even the building turned out to be quite difficult for my 8 year old son, because the parts are not very precisely worked out and either again even need regrinding or must exert much pressure. However, this is not very advisable, because this is the same time one wing broken off from the propeller. Rotate the propeller does only when the solar cell max. Holds 3 cm away from a good light source. Was a short and fun it is still too expensive.
