Skyscraper shapes and wind forces
The hypothesis that a circular cross-section shaped skyscraper will be able to withstand the greatest force of wind is proven to be correct.
Apart from wind factor, another limitation in building skyscrapers is in meeting elevator requirements. Taller buildings have more people working or living in them and therefore more space needs to be allocated for elevators on the ground floor. To overcome this problem, double- decked elevators and sky lobbies are used as intermediary points to improve efficiency of the elevator system.
The experiment can also be done by constructing model buildings with denser material such as wood.
It would also be interesting to ascertain if the type of surface or paintwork on a building will affect its resistance to wind forces. For example, would a building with an exterior consisting mainly of glass or metal be more resistant to wind, than one consisting of masonry?
How skyscrapers work - http://science.howstuffworks.com/skyscraper4.htm
How tall can skyscrapers be? - http://www.wisegeek.com/how-tall-can-skyscrapers-be.htm
Basic safety requirements. Ensure that you handle the fan with care to avoid accidents.