SUNDAR, SHUKNA, RUKMA

He also described the construction of warplanes and fighter planes. Vaimanika Shastra explains the metals and alloys and other essential materials to make an aircraft indestructible in any condition. Along with the treatise are pictures of three types of airplanes – “Sundar”, “Shukna” and “Rukma”. The vimanas are classified into three types – Mantrika, Tantrik and Krutaka, corresponding to different eras or eras. The aircraft used in Kali Yuga, the running Yuga is called Krutakaviman, which is flown with engine power.