Abstract: An auxiliary marine propeller drive, primarily for sail boats. The propeller drive is retactable into a water tight cavity formed in the hull of the boat when not in use, thus not distracting from the symmetry of the hull design. Means are provided within the cavity in the form of vertical guides over which the propeller assembly is reciprocally removed into and out of the water tight cavity. There is also included a cam member which will effect rotation of the blades of the propeller into a set position whereby they can be moved through the smallest possible area into and out of the water tight cavity.