Do not do your child to

Our 10-year-old should be brought closer with this box the physics of wind power. Full of energy, we went to work and watched the good explanations in the booklet on but already during the assembly began to have doubts. The axes seemed bit stiff, the transmission sluggish and so not ideally shaped wind blades for light winds. The wing has considerably better for strong winds.

Fortunately, we have the part on a windy day could try in Natura same, but the result was disappointing. Wind strength 3 gusts 4 the wheel was able to move, but the LED was barely a glimmer to elicit - Zumm on electricity charging a battery is not to be thought since.
I quickly tuned for strong winds - the wing change is quick and easy. In fact, encouraged what, though less rotation, rather twist and crash broke the teeth of primitive manual transmission.

The idea is good, but in practice a disaster and my son after 5 minutes the pleasure lost. The car models that you can build with the box no longer interested him. Fear of renewed disappointment ?!

Incidentally, the wind turbine works even if one has a fan, and thus more uniform airflow drives.