I put together a lesson where students created sail cars, and we used a fan for power. Students studied the impact of area (and perimeter) of the sail on how far the sail would go. (Depending on grade level, this can cover math - area and perimiter calculation; science (experimentation, force-distance, measurement) engineering (sailcar design)

here's a link to the lesson plan

https://docs.google.com/document/d/100HIrTibRUE3p7aUq70IFVN3EHR6-A7BZBLs_uht_ak/edit?usp=sharing

 

and a few pictures/videos from my class: