 Mauro's "Easy Riser" was used by "Father Goose", Bill Lishman.Other biplane ultralights include the Belgian-designed Aviasud Mistral, the German FK12 Comet (1997–), the Lite Flyer Biplane, the Sherwood Ranger, and the Murphy Renegade.The feathered dinosaur "Microraptor gui" glided, and perhaps even flew, on four wings, which may have been configured in a staggered sesquiplane arrangement.