a free spinning annular cylinder - like hollow body , having a leading and trailing end which are open at the ends . the leading end contains a balanced , uniformly and heavily weighted dense rim for generating gyroscopic forces . when the device is propelled forward with a spinning motion about an axis in substantially the direction of flight , the body is gyroscopically stabilized , in reference to direction , attitude and orientation . the weighted rim also shifts the body &# 39 ; s center of gravity toward the center of pressure , near the leading edge , which enables creation of lift .