The first one was ridden by a guy who didn't understand the dynamics of heavy braking with only one wheel.
After he face planted at the first corner he went to work for some guy named Igor Sikorsky who at the time was developing a new aviation device with weird bits spinning in opposite directions and bouncing up and down.
Needless to say he didn't last long in that job either.
He was last seen "walking backwards to christmas, across the irish sea"
Blueprints were last seen in The Vatican Archives in the Leonardo Da Vinci section
I have been unable to confirm any of the above, but I don't doubt the veracity......well......on the other hand!!!???? ........