640px-Spaceship One and White Knight in flight 1.jpg
WhiteKnightOne in flight.

Scaled Composites Model 318 "WhiteKnightOne" (aka WK1, formerly White Knight) is an external-drop-carry cargo airplane. It was designed as the mothership for Scaled Composites SpaceShipOne, as part of Scaled Composites Tier One; though it can carry out other tasks. It is an evolution of the Scaled Composites Proteus design. The follow-on design to this one is Scaled Composites WhiteKnightTwo. Only one example of WK1 has been built by Scaled Composites, N318SL.

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