PROJECT VISHNU: INDIA’S EMERGING HYPERSONIC MISSILE PROGRAM

1)      Introduction: India is entering a new era of advanced deterrence with Project Vishnu, a DRDO-led initiative to develop a long-range, scramjet-powered hypersonic cruise missile, formally known as ET-LDHCM (Extended-Range Long-Duration Hypersonic Cruise Missile). As global powers race to develop hypersonic weapons—capable of travelling above Mach 5 with unpredictable manoeuvrability—India’s program signals strategic intent to safeguard national security, enhance deterrence, and achieve technological parity with China and other major military powers.

2)      What Project Vishnu Is About

Project Vishnu builds on India’s Hypersonic Technology Demonstrator Vehicle (HSTDV) success of 2020, which validated scramjet combustion in supersonic airflow. Vishnu aims to create both conventional and nuclear-capable hypersonic missiles that can penetrate next-generation air-defence systems. The programme integrates expertise from aerodynamics, materials science, propulsion engineering, and indigenous defence manufacturing—aligned with Atmanirbhar Bharat.

3)      Development Status

Post-2020, DRDO accelerated work on high-temperature composites, computational fluid dynamics, and engine integration. By 2024, prototypes entered fabrication. In mid-2025, India conducted its first integrated hypersonic cruise flight trial from the eastern seaboard. Sustained scramjet endurance tests exceeding 1,000 seconds indicate high propulsion stability. Full operational induction is targeted before 2030.

4)      Understanding Hypersonic Weapons

Two main types exist:

1.      Hypersonic Glide Vehicles (HGVs) – rocket-launched, then glide unpredictably.

2.      Hypersonic Cruise Missiles (HCMs) – scramjet-powered, using atmospheric oxygen.

Project Vishnu is an HCM. Its scramjet ignites only at very high speeds, requiring a solid-fuel booster for initial acceleration.

5)      Design & Propulsion

Vishnu features:

• Slender, low-drag airframe to withstand >2,000°C heating
• Carbon-carbon composites and ceramic matrix materials
• Active cooling systems
• Solid booster + scramjet cruise stage + integrated warhead
• Advanced navigation suite combining inertial, satellite, and terminal guidance

Scramjet propulsion allows speeds > Mach 8, long ranges, and heavy payloads due to oxygen-breathing efficiency.

Expected Performance

• Range: 1,500–2,500 km
• Speed: Mach 8+
• Payload: 1,000–2,000 kg (conventional or nuclear)
• Launch platforms: Land, sea, air
• Mission profile: Low-altitude, manoeuvrable, radar-evading flight

Kinetic energy alone enables destructive capability even without large warheads.