Their Frisbee design was first introduced in 1994 .
Their Frisbee design was first quickly evolved into a model that could swing 40 passengers up to 90 degrees at 63 feet ( 19 m ) off the ground .
Their Frisbee design was first introduced in 1994 and quickly evolved into a model that could swing 40 passengers up to 90 degrees at 63 feet ( 19 m ) off the ground .