Air Independent Propulsion (AIP) Technology (Download PDF)


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AIP is a marine propulsion technology which access non-nuclear submarine to operate without access to atmospheric oxygen. On 30th Oct 2019, DRDO tested a land based prototype of an Air Independent Propulsion (AIP) for submarine. The prototype operation at the naval materials research laboratory in Ambernath, Maharashtra, giving boots to the DRDO’s plan to develop AIP system for Indian submarines.

Image show of Air Independent Propulsion Technology

Image Show of Air Independent Propulsion Technology

Image show of Air Independent Propulsion Technology

Air Independent Propulsion (AIP) Overview:

  • Normally, submarines have to stay under waters for longer duration by this they are not detected by the enemy submarines. When these submarines come to the surfaces of the water there is a chance to get detected and attack by enemy submarines.
  • AIP significantly improves stealth because it enables a submarine to generate electricity for services and battery charging and propulsion while completely submerged which gives it invulnerability and makes more difficult for enemy to detect it.
  • There are 2 types of submarines conventional and nuclear. Conventional submarines are use a diesel electric engine, and must come to surface daily for oxygen for fuel combustion. But with AIP system the submarines needs to take oxygen only once in a week.
  • Nuclear submarines constantly pump coolant generation some amount of noise but non-nuclear submarines running on battery power or AIP can be virtually silent.
  • There are four types of AIP are found
  • Closed-cycle diesel engines
  • Closed cycle steam turbines
  • Sterling engines
  • Fuel cell

- Published/Last Modified on: November 6, 2019


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