:: Before leaving the classroom you can suggest ways the students might experiment on their own. 

Several bottles could be manifolded together, plumbing the airflow into a single turbine. If two such bottles were placed at either end of a pitching raft (say, tied to a piece of wood), the airflow through the turbine might be steadier. 

Encourage them to test different shapes and sizes of floating platforms in a swimming pool (where their friends will have to make the waves), or at the shores of a lake or river, where the waves are of the same small scale as their models.

This page completes the 5 pages of information for schools

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