It is the "Gas Turbine Research Establishment" in Bangalore. It was established in 1959, as a control agency for the different aeronautical research and development centers in the country.

-Indigenous projects are known as GTX, very influenced by other existing engines in the world.

“Kaveri”

-Without detracting from these projects, the GTX-35 is an advanced turbojet engine with a 5-stage HP compressor, an annular chamber and a single-stage turbine.

-The GTX-35-VS is a turbofan that has three LP stages with transonic blades, a 5-stage HP compressor and an annular chamber. It has a single-stage HP turbine and a single-stage LP turbine as well. It uses FADEC and is from the years 1991/92. It delivers 11,380 lbf of thrust in "dry" and 18,000 lbf with afterburner.

-The turbojet GTX-37, version 14-U with afterburning, gives 10,000 lbf of normal thrust and 14,450 lbf with afterburner and it ran for the first time in 1977. The 14-UB version is a turbofan that gives 19,990 lbf of thrust.

-GTRE is also the main base of the largest aeronautical center in India: the Hindustan Aeronautics Ltd. (HAL).

-Lately it is involved in the development of the "Kaveri" engine for LCA (Light Combat Aircraft).

-The engine ran for the first time in 1994, delivering about 12,000 lbf "dry" and 18,000 lbf "wet" (with afterburner).

-The "Kaveri" is considered an improved version of the GTX-35, with a redesigned "core", FADEC and an advanced outlet nozzle.

From Appendix 9: A new little-thrust turbine engine for UAV vehicles appears  It is the Laghu Shakti.

-The author has the belief that it is already an engine with a certain active career and that a kind of frontal fan has been added to the compressor. It was presented in a recent aeronautical fair.

“Laghu Shakti cutaway with fan details” (PiP)

-GTRE has another interesting story, the turbojet Kaveri. Below we show a new photograph from an engine booklet. As mentioned, the altitude tests were done in Russia.

“GTRE Kaveri”

-At the 2025 AeroIndia, two new engines, designed by the GTRE (Gas Turbine Research Establishment), have been presented together with DRDO (Development and Research Defense O).

-They are the Manik I, and an unknown or little published for the public domain,  Manik II.

“Manik I”

-The Manik presented with a side cutaway section is the 42.5 KN, possibly for the UCAV (Unmanned Combat Aerial Vehicle) "Aura".

“GTRE Manik I rear view”

-This engine has a very simple look but it has an enigmatic cylinder on top of the engine.

“GTRE, Manik II” (Defenceforumindia.com)

“Frontal del Manik II”

-Common design between  GTRE and DRDO.