Hey guys! I have something pretty fun to play with that I built in like 10 minutes. It's a pretty powerful & fast spinning machine. The concept is that you put something at the end of the rod to test with G-Forces. It is recommended that you have what ever is at the end balanced in terms of weight. It doesn't, however, have to be 100% balanced. You can have it a little unbalanced since the base is super heavy. The engines that power it (20x BLASTO BFE 300) are rotatable, so you can make the turbine spin in the opposite direction. NOTE : If you rotate the engines when the are on or cooling down, they will pull the entire turbine foward and cause it to tip over in some cases. Have fun and enjoy! :D