If you notice, on the second youtube video Sid posted, the dorsal fin was rotating completely around as he started his run. I noticed it at the time and have video of it somewhere. It was controlled by some sort of autopilot device which was malfunctioning, and was removed for following runs.
His "Art Arfons" personalized speedometer was calibrated and numbered to 700 MPH. Cool operation, even his starting unit was turbine powered.
Ron