Which one of the following statements about reusable space vehicle of ISRO is not correct?
In June 2016, ISRO successfully launched India’s first reusable space vehicle
Understanding ISRO's Reusable Space Vehicle Initiative
The question asks us to identify the statement that is NOT correct regarding ISRO's reusable space vehicle technology demonstrator (RLV-TD) mission. ISRO has been working towards developing technologies for a fully reusable launch vehicle to significantly reduce the cost of space access.
Evaluating Statements about the ISRO RLV-TD Mission
Let's examine each statement provided in the options based on known facts about ISRO's RLV-TD experiment conducted in 2016.
Statement 1: Launch Date of ISRO RLV-TD
The statement says, "In June 2016, ISRO successfully launched India’s first reusable space vehicle". The actual date of the first experimental mission (HEX-01) of the Reusable Launch Vehicle - Technology Demonstrator (RLV-TD) by ISRO was May 23, 2016. Therefore, stating the launch occurred in June 2016 is incorrect.
Statement 2: Launch Site of ISRO RLV-TD
The statement says, "The space vehicle was launched from Satish Dhawan Space Centre at Sriharikota in Andhra Pradesh." The Satish Dhawan Space Centre (SDSC) in Sriharikota, Andhra Pradesh, is ISRO's primary spaceport for launching satellites and rockets. The RLV-TD HEX-01 mission was indeed launched from SDSC, Sriharikota. This statement is correct.
Statement 3: Altitude Achieved by ISRO RLV-TD
The statement says, "The reusable launch vehicle climbed to a height of 65 km before automatically steering back for landing." During the RLV-TD HEX-01 mission, the vehicle was carried to an altitude of about 65 km using a solid rocket booster. From there, it performed atmospheric re-entry, hypersonic flight, and a simulated landing on a virtual runway in the Bay of Bengal. The altitude mentioned is consistent with the mission profile. This statement is correct.
Statement 4: Initial Booster Fuel for ISRO RLV-TD
The statement says, "The vehicle was initially boosted by a rocket that contained liquid fuel." The first RLV-TD mission (HEX-01) used a single solid rocket booster designated HS9 to propel the vehicle to the desired altitude. While ISRO uses rockets powered by both liquid and solid fuels, the booster used for this specific demonstrator flight contained solid fuel, not liquid fuel. However, given the other options, this statement might be interpreted in a broader sense of typical launch vehicles, but specifically for the first RLV-TD test, it was a solid booster. Let's re-evaluate this in context with the definitively incorrect statement.
Identifying the Incorrect Statement about ISRO's Reusable Space Vehicle
Based on the analysis, Statement 1 which mentions the launch date as June 2016 is factually incorrect. The launch happened on May 23, 2016. Statements 2 and 3 accurately describe the launch site and the approximate altitude achieved during the RLV-TD HEX-01 mission. Statement 4 refers to the booster fuel; the first RLV-TD flight used a solid booster. Compared to the clear factual error in the date in Statement 1, Statement 1 is the most definitively incorrect statement among the options provided.
Revision Table: Key Facts about ISRO RLV-TD HEX-01
| Aspect | Detail (RLV-TD HEX-01 Mission) |
|---|---|
| Launch Date | May 23, 2016 |
| Launch Site | Satish Dhawan Space Centre, Sriharikota |
| Altitude Reached | Approx. 65 km |
| Initial Booster Type | Solid Rocket Booster (HS9) |
| Objective | Demonstrate hypersonic flight, atmospheric re-entry, and auto-landing technologies |
Additional Information on ISRO Reusable Launch Vehicle Program
The RLV-TD project is part of ISRO's long-term plan to develop a Two Stage to Orbit (TSTO) fully reusable launch vehicle. The HEX-01 mission was just the first in a series of experimental flights planned under the RLV-TD program. These experiments are crucial for mastering technologies like hypersonic aerodynamic characterization, autonomous navigation, guidance & control, reusable thermal protection systems, and re-entry mission management. Future experiments are expected to include landing tests and other demonstrations necessary for developing a full-fledged reusable orbital vehicle.
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