Abstract: A compact drive assembly for a wheeled transporter, illustrated as a wheelchair, and method convert reciprocating input forces applied by oppositely-directed essentially linear strokes to a drive shaft journaled for rotation in opposite directions of rotation about a central axis of rotation within the drive assembly, into rotation of a drive wheel of the transporter in a given single direction of rotation. Oppositely oriented clutches couple the drive shaft with respective sun gears. Sets of planet gears are engaged with corresponding ones of the sun gears and are overlapped for engagement with one-another. One of the sun gears is coupled to the drive wheel such that upon rotation of the drive shaft alternately in the first direction and the second direction in response to the oppositely-directed strokes, the drive wheel is rotated in the same given single direction of rotation during each direction of rotation of the drive shaft.