SOURCE: AFI
The Gas Turbine Research Establishment (GTRE) under India’s Defence Research and Development Organisation (DRDO) is pushing forward with the development of the Kaveri Derivative Engine (KDE), also known as the Kaveri Dry non-afterburning engine. This engine version produces 46 kN of thrust (IRA SLS – International Reference Atmosphere Sea Level Static) but comes with a substantial weight of up to 1180 kg, which is on the heavier side for engines in its class, even without an afterburner.
The KDE’s weight is particularly notable because, even without the additional mass of an afterburner section, it matches or exceeds that of some engines equipped with afterburners. This discrepancy could limit its application in manned fighter jets where weight-to-thrust ratio is critical for performance.
For manned aircraft, excess weight can adversely affect agility, fuel efficiency, and payload capacity. This is a significant consideration for integrating the KDE into platforms like the Light Combat Aircraft (LCA) or other fighter jets where every kilogram counts.
GTRE’s approach to reducing the engine’s weight involves the substitution of current materials with lighter alternatives. This includes exploring advanced composites or lighter alloys that can withstand the high temperatures and stresses of jet engine operation. The weight reduction plan is being executed in phases to ensure that each change does not compromise the engine’s integrity or performance. This methodical approach allows GTRE to test and validate each modification thoroughly.
While the weight might pose challenges for manned fighters, it is less of an issue for the 13-ton Remotely Piloted Strike Aircraft (RPSA) Unmanned Combat Aerial Vehicle (UCAV) project, where the KDE is currently planned to be utilized. Here, the focus can be more on thrust and endurance rather than on minimizing weight for human pilots.
GTRE aims to have the KDE cleared for production once the weight reduction targets are met. This process is not just about shedding kilograms but ensuring that the engine remains reliable, efficient, and meets all operational specifications.