Abstract: A hydroplaning disk for safely projecting and skimming or skipping upon and across the surface of a body of water at the air-water interface for sport or recreation. The hydroplaning disk includes an ellipsoidal bottom surface, a top surface, and a deformable rim. The deformable rim deforms and returns to its original shape after absorbing impact energy. The top surface has an aerodynamic lip section with a leading edge portion, a peak portion, and a trailing edge portion. The aerodynamic lip section is integrated with a trough portion. The trough portion is integrated with an upraised central dome portion that has a central dimple which intrudes into the dome portion. The trough portion includes a water collecting groove and bailing channels. The ellipsoidal bottom surface includes anti-friction grooves or dimples. The hydroplaning disk has gripping means to provide a secure grip for throwing when hydroplaning disk is wet, and grasping means for safely throwing and catching the hydroplaning disk.