The one design capability that Hindustan Aeronautics Ltd. (HAL) has yet to acquire is that for gas turbine propulsion systems. Admittedly, they had got in to that field years back, but only in a very small way. About the very earliest jet engine that HAL had designed in-house was the very simple HJE-2500 single-shaft axial-flow turbojet of about 1,150 kg-f thrust. It was followed years later, in 1994, by the PTAE-7 for the Pilotless Target Aircraft Lakshya. That engine was a single-shaft turbojet with a four-stage transonic axial compressor driven by a single-stage axial turbine. It had a thrust of 370 daN (380 kg-f) and was designed to be refurbished and reused after each recovery. The Chief Designer, Mr. T. V. Vareed, can be regarded as the "father of turbine engine design in India".
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机译：印度斯坦航空有限公司（HAL）尚未获得的一项设计能力是燃气轮机推进系统的设计能力。诚然，他们早在几年前就涉足了该领域，但规模很小。 HAL内部设计的最早的喷气发动机是推力约为1,150 kg-f的非常简单的HJE-2500单轴轴流涡轮喷气发动机。几年后，即1994年，PTAK-7被用于无人驾驶目标飞机Lakshya。该发动机是单轴涡轮喷气发动机，带有由单级轴向涡轮驱动的四级跨音速轴向压缩机。它的推力为370 daN（380千克力），设计用于每次恢复后进行翻新和重新使用。首席设计师T. V. Vareed先生被视为“印度涡轮发动机设计之父”。
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