The stepper shuttle was adapted from an old SpaceX Dragon and twain technology thus making it able to step.[1]
It was used by Willis Linsay, Sally Linsay and Frank Wood to reach the Brick Moon.[2]
The one they used was piloted by Al Raup but everything is automated and the shuttle compensates the Earth's rotation speed itself and can direct itself to the Brick Moon.
Appearance[]
It is described as a cone-shaped spacecraft, looking like an Apollo command module on four legs.[2]