New Delhi: Gaganyaan Mission achieved another major milestone after the Indian Space Research Organisation (ISRO) successfully completed the first ground test of the SOLVE (Sub-Orbital Launch Vehicle for Experiments) solid motor. The successful test is an important step towards validating the parachute-based deceleration system that will safely return the Gaganyaan Crew Module to Earth during future human spaceflight missions.
ISRO Conducts First SOLVE Ground Test Successfully
ISRO carried out the first ground test of the SOLVE solid motor on July 3, 2026, at the Static Test Facility of the Satish Dhawan Space Centre (SDSC), Sriharikota. According to the space agency, all motor performance parameters matched expectations, confirming the successful operation of the new test vehicle.
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What is SOLVE Ground Test
SOLVE stands for Sub-Orbital Launch Vehicle for Experiments. ISRO is developing this solid motor-based vehicle as a dedicated test platform for the Integrated Parachute Tests of the Gaganyaan Crew Module.
The vehicle will help scientists validate the parachute system under different flight conditions before astronauts are sent into space.
How Will SOLVE Ground Test Support the Gaganyaan Mission
During future SOLVE missions, the Crew Module will be lifted to an altitude of 10–17 kilometres. After reaching the required height, the module will separate from the vehicle.
A sequence of 10 parachutes will then deploy to slow the Crew Module before it safely splashes down in the sea. This process is designed to verify the safety and reliability of India’s human spaceflight recovery system.
Technology Behind the SOLVE Vehicle
The SOLVE solid stage is based on the PSLV Strap-on Motor, but ISRO has introduced several important modifications. These include:
- Slow burn-rate propellant
- Straight nozzle design
- Secondary Injection Thrust Vector Control (SITVC)
These upgrades make the vehicle suitable for Gaganyaan’s specialised testing requirements.
What is the Importance of SOLVE Ground Test
ISRO said the SOLVE vehicle provides greater flexibility in conducting Gaganyaan test missions under different simulated mission conditions. The successful ground test strengthens India’s preparations for its first human spaceflight mission and improves confidence in the Crew Module’s safe landing system.
Gaganyaan Mission Progress
Over the past few months, ISRO has completed several important milestones for the Gaganyaan programme. These include the second Integrated Air Drop Test (IADT-02) and the Mission Mitra behavioural study, where astronaut candidates participated in extensive scientific and behavioural evaluations.
The first uncrewed Gaganyaan mission has been delayed from its earlier schedule as ISRO continues additional testing to ensure maximum crew safety.
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