1978 Bob Mc Tavish shaped SKY twin fin clocks some tube time. 2.
I asked Bob Mc Tavish for a little design history on the board. He wrote-
"I shaped heaps of twin fins for Sky from 1976 to 1979. Many had channels, many didn’t. I loved those boards at Lennox through those years. By 79 we were adding a small fin box in the tail, and a small centre fin, so we weren’t far off the Thruster 2 years before Simon. Speed with great glide, yet solid pivot. A good design. - Bob"