The Hipp's Superbirds J-3 Kitten and related designs are a family of single-engined, single seat, high wing conventional landing gear-equipped aircraft available in kit form or as plans from of Saluda, North Carolina. The J-3, J-4 and Reliant designs are intended to have empty weights under 254 lb (115 kg) and fit into the US ultralight category. The remaining designs are heavier and fit into the US Experimental - Amateur-built category.