//It's the same as in college level help forum but it fits better here i think...// Now it's time for me and a friend to prepare our project for a physics tournament in school. The task is: Construct a car which is proppelled solely by wind energy. The car should be able to drive !straight! into the wind. Determine the efficiency of the car. I would like some ideas for an efficient solution. I have researched how boats do it. They can't sail straight into the wind they can only zig zag, which is not sufficient. My idea was to use Bernoulli's principle which is the one that aircrafts use. Create a low pressure in the front of the car and hight pressure behind it, this might be able to move it forward. My friends idea was to use, i dont know what you call it... umm it consists of three cups (from above) ,,,,,,,,,,< ,,,,,,,,,,| ,,,,,,,,,/ \ ,,,,,,,>,,,/\ Horisontally as in: .........O-O-O .............| ......----------> .......0.........0 Something like that, it's three cups placed with angles of 60 degrees. This module always rotates no matter from which direction the wind is coming. This might be used to drive some kind of axis which then moves the wheels... Any ideas or suggestions? We are in high school, but the project is supposed to be solved with help of others, we are to consult with professors later on. Our task is mainly to make a final presentation of our ideas and lab results and then to present and defend them.