Hi to all, this is my first topic and I hope I'm not in the worng section. As you can see at this link: http://www.skeetty.com/disco.jpg, I have a plate with a diameter of 4 meters which can rotate at 200 RPM. On this platform, I have four fans with 4 blades where the lenght of each blade is 1 meter and its width is 0.4 meters. Is it possible to understand if the fans are able to rotate during the disc rotation? If not, what is the condition which make the fans to rotate? For example, if I increase the RPM of the disc, then the fans can rotate? What kind of formulas do I have to use in order to better understand the problem? Thank you and I'm sorry for my english.