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A Green Propulsion System, developed under the Technology Development Fund (TDF) scheme of the Defence Research and Development Organisation (DRDO), has successfully demonstrated in-orbit functionality on a payload launched by PSLV C-58 mission. 

• The TDF is a flagship programme of the Ministry of Defence executed by DRDO under the ‘Make in India’ initiative for funding innovation in defense and aerospace, especially to start-ups and MSMEs.

Green Propulsion System

• The Green Propulsion System consists of indigenously-developed propellant, fill and drain valves, latch valve, solenoid valve, catalyst bed, drive electronics, etc.
• ISRO has made a beginning by developing an eco-friendly solid propellant based on Glycidyl Azide Polymer (GAP) as fuel and Ammonium Di-Nitramide (ADN) as oxidizer at the laboratory level, which will eliminate the emission of chlorinated exhaust products from rocket motors.
• Executed by Bengaluru-based startup Bellatrix Aerospace Pvt Ltd, the project involves a 1N Class Green Monopropellant thruster designed for microsatellite attitude control and orbit maintenance.

Significance Of Green Propulsion Systems

• Environment-Friendly: This innovative technology has resulted in a non-toxic and environment-friendly propulsion system for low orbit space. 
• Ideal for Space Missions: It is ideal for those space missions with high thrust requirements.
• Demonstration Of: Pulsed mode and steady state firing in vacuum, passivation of residual propellant in outer space, propellant realisation and establishing of filling procedure under the TDF.

What Are Green Propellants?

• Green propellants offer 50% higher performance over a traditional hydrazine propulsion system, due to its higher density and higher specific impulse (Isp). 
• They are easier to handle and, therefore, lower cost to integrate and fuel for operation.

News Source: PIB