The "circle paper airplane," also known as the "circular glider" or "tubular glider," is a unique and interesting variation of traditional paper airplanes. While they might not achieve the long distances of some traditional paper airplane designs, circular paper airplanes can exhibit impressive stability and can be capable of sustained flight in the right conditions. They are particularly fascinating when flown indoors, where air currents are minimal, and their unique flight patterns can be full

NASA's experimental glider