Aviation history in the palm of your hands! Launch or toss this amazing glider and watch it soar. The Internal Wing Aircraft was invented by Robert Carr to capture the energy wasted by conventional wings. When the air passes through the unique wing configuration nearly all of the energy is used and creates the phenomenon that we have called the Dynamic Natural Propulsion. This effect also works in water converting buoyancy to thrust (9 inches long by 7 inch wing span).