Varunastra: Indigenous Heavy weight torpedo | Test fired for Maximum Endurance
Varunastra: Indigenous Heavy weight torpedo
Varunastra as we all know is a ship launched, heavy weight, electrically propelled anti-submarine torpedo capable of targeting quiet submarines, both in deep and shallow waters in an intense countermeasure environment. Varunastra can be fired from all ASW ships capable of firing heavy weight torpedoes.
The torpedo has been developed by Naval Science and Technological Laboratory (NSTL) of the Defence Research and Development Organisation (DRDO). The ship launched variant of Varunastra torpedo was formally inducted in the Indian navy on 26 June 2016. One unit of Varunastra cost around 10-12 crore. Varunastra is considered to be 95% indigenous.
Varunastra Test fired for Maximum Endurance
Recently, BDL has released its annual report for the year 2020-21. As per the report, Varunastra has been test fired in combat mode to test the maximum endurances of the batteries for full length of 20 Km. The test has been successful and met the mission requirements and objectives. Apart from this test, three more regular practice firings of Varunastra were successfully conducted. All these tests were performed in last financial year.
Technical Specification
The Varunastra weighs 1.5 tons and carries a 250-kg warhead. It is (7-8 meters) long and has a diameter of 533 mm – this dimension is derived from the British 21-inch torpedo first seen in use before the First World War. The Varunastra heavy-weight torpedo can reach a maximum speed of 40 knots, or 74 kmph, making it the third fastest of its kind in the world, after the Mk 48 ADCAP (Advanced Capability) and WASS Black Shark torpedoes.
The Varunastra is powered by a DRDO-developed enhanced silver oxide-zinc battery system rated at 250kW and can reach depths of up to 400 meters. The Varunastra’s batteries have a life of up to five years and can tolerate tremendous pressure and stress.
What makes Varunastra invincible?
Varunastra has a dual guidance system which includes wire-guidance and active-passive acoustic homing. The active acoustic homing system in the Varunastra directs itself based on the echoes received in response to sound-pulses generated on-board, much like SONAR. The wire-guidance is via a thin-wire, which is also a communication medium between the torpedo and the firing ship. DRDO has also developed a 26-km-long guidance wire divided across two spools, which is being used in the Varunastra. The wire spools have a twin-core copper cable, wound in such a way that the unreeling is quick and smooth. If the target is located at a range exceeding 40km, the torpedo uses its acoustic homing to locate it. The torpedo changes direction via hydraulically controlled fins that adjust their position according to the homing signals received by the three pressure transducers on board. A key factor in improving the Varunastra’s performance and accuracy is the use of autonomous guidance algorithms and low-drift navigation systems.
In case the enemy uses countermeasures, the Varunastra can be guided via Global Positioning System (GPS), and the DRDO claims the Indian heavyweight torpedo is the first in the world to have added this to its tech suite.
The submarine-launched version of the Varunastra will be guided via a fibre-optic channel and will feature an improved front-end seeker. There are plans to test fire a submarine version with some minor modifications the.
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