Students and coaches should look at the web site to see a sample set-up of the apparatus. The equipment that will be used matches this set-up.
The blade or "sails" of the windmill must clear the clamp.
Go to this web site. http://soinc.org/physics_lab_b Physical Science Middle School

John H. Ostendorf
Professor, Physics & Engineering Department
Vincennes University
Vincennes, Indiana
812-888-4098
jostendorf@vinu.edu