I huvudsak ... inget .
Själva styrelsen, även om den är energiserad av Power Cosmic, har ingen kraft på ryttaren.
Styrelsen är i allmänhet kontrollerad av vem som har Silver Surfers krafter (och sålunda förefaller det, hans psioniska länk till det).
Detta har inkluderat Thaddeus Ross (som Red Hulk) och Dr. Doom (icke-film). I båda fallen stal de eller absorberade Surferens kraft. Inte styrelsens.
Cosmic Surfboard: When flying, the Silver Surfer uses a construct which resembles an earthly surfboard. This "board" is made with the same silvery material (The Galactic Glaze) that composes the Surfer's body, thus making the board indestructible. Few forces aside from the power cosmic itself can affect it, and if it is somehow damaged, the Surfer can easily repair it in an instant.
The board is psionically linked with the Surfer's mind in some unknown fashion, and it follows his commands instantly. It apparently taps cosmic energy in much the same fashion as the Surfer himself, and although the Surfer could theoretically use the power cosmic to fly without his board, the construct enables him to do so without expending any of his own energy.