Abstract: Structure is provided which provides a changeable bow configuration for a floating hull which requires a bow configuration which facilitates travel through water only part of the time. An amphibious vehicle is an example of such a requirement, wherein the bow of the vehicle hull in the land mode is relatively snub-nosed presenting a hard unyielding surface to ground obstacles such as rocks and mounds as it travels over the terrain. The amphibious vehicle in a sea or water traveling mode generally requires additional buoyancy in the bow to prevent a diving tendency when underway and also requires a shape better adapted to travel along the surface of the water than the snub-nosed bow configuration of the land mode. Left and right moveable bow segments and a lower bow segment are retracted in the land mode to form the snub-nosed or bow.