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The Vimanika Shastra is remarkable not only for its age but also for its detailed descriptions of various types of Vimanas. According to the text, there are four distinct classifications: the Rukma Vimana, the Tripura Vimana, the Shakuna Vimana, and the fourth type, variously referred to as the Sundara Vimana. These Vimanas are depicted as diverse in shape and design—some resembling airplanes with wings, others taking the form of cigar-shaped Zeppelin crafts, and yet others appearing as helicopter-like vehicles or disc-shaped flying saucers.