I plan on making a mini-wind tunnel that is cheap (less than a hundred dollars), with the help of a sophomore. We had to apply Bernoulli's principle to get the target airspeed of 40 mph, while keeping costs lows. We plan on using 5 small  but cheap fans, which is why we need Bernoulli's Principle. We are using scrap parts and materials from my school's Innovation center combined with bought fans. This is the basic layout of what it would like. The fans would go in the back, the red parts are 3D printed. We plan on using straws to separate the streams of air on entry and then having 3D printed tubing to get the smoke in.

This is a small project I am working on with the same sophomore. We call it the Wingman, it’s meant to be thrown like a card.