In the Yantra Sarvasva, sage Maharshi Bhardwaj describes vimana, or aerial aircrafts, as being of three classes:
4. Roopaakarshana: By means of the photographic yantra in the Vimana to obtain a television view of things inside an enemy's plane.
5. Stabdhak: By projecting apasmaara poison fume smoke through the tube on the north side on the Vimana, and discharging it with stambhana yantra, people in enemy planes will be made unconscious.
6. Chaapla: On sighting an enemy plane, by turning the switch in the force center in the middle section of the Vimana, a 4087 revolutions an hour atmospheric wave speed will be generated, and shake up the enemy plane.
7. Parashabda Graahaka: As explained in the "Sowdaaminee Kalaa: or science of electronics, by means of the sound capturing yantra in the Vimana, to hear the talks and sound in enemy planes flying in the sky.
Read the part (ii) of Ancient Vimanas; @here...