All you need to know about Vikram-1, India’s first privately developed orbital-class rocket
Skyroot Aerospace's Vikram-1, India's first privately developed orbital-class launch vehicle, was readied for its maiden orbital flight, designated Mission Aagaman, from the First Launch Pad of the Satish Dhawan Space Centre (SDSC-SHAR), Sriharikota.
Vikram-1 is a four-stage, roughly seven-storey-tall (about 20-metre) expendable rocket with an all-carbon-composite airframe; its first three stages use solid propulsion (the Kalam-1200, Kalam-250 and Kalam-100 motors) and the fourth stage uses a liquid, restartable engine cluster (Raman-1 engines) for precision orbital insertion.
The mission is designed to place customer small satellites into a roughly 450 km orbit at 60-degree inclination, requiring the liquid upper stage to execute precise orbital-insertion manoeuvres.
The attempt marks the first time an Indian private company has tried to place a payload into orbit, building on Skyroot's November 2022 Vikram-S suborbital flight (Mission Prarambh) — India's first-ever private rocket launch, which reached about 89 km altitude.
The launch proceeds within India's private space sector framework, under which the Indian National Space Promotion and Authorisation Centre (IN-SPACe) authorises private launch and satellite activity, while ISRO/SDSC-SHAR provides launch-range infrastructure.
India's Private Space Sector Framework: IN-SPACe, NSIL and the Indian Space Policy 2023
India's space sector was long dominated by ISRO as sole operator; reforms since 2020 opened it to private participation. The Indian National Space Promotion and Authorisation Centre (IN-SPACe), an autonomous body under the Department of Space, is the single-window agency that authorises, promotes and hand-holds private ("Non-Government Entity") space activities — including launches, satellite operation and use of ISRO infrastructure. NewSpace India Limited (NSIL), a Department of Space public sector undertaking, separately handles commercial aspects — transferring ISRO-developed technology to industry and marketing space products/services. The Indian Space Policy 2023 formalised this by delineating roles: the Department of Space sets policy, ISRO focuses on R&D and new technology, IN-SPACe regulates/authorises, and NSIL commercialises.
Key Details
- IN-SPACe was set up in June 2020 as the nodal single-window agency for private-sector space activity in India.
- The Indian Space Policy 2023 is the overarching framework document that formally separated ISRO's research role from IN-SPACe's regulatory role and NSIL's commercial role.
- Private firms may access ISRO facilities (such as launch pads at SDSC-SHAR) with IN-SPACe authorisation, as seen in Skyroot's use of the First Launch Pad for both Vikram-S (2022) and Vikram-1.
Vikram-1's launch from ISRO's Sriharikota range, under an IN-SPACe-authorised private mission, is a direct real-world application of the 2023 policy's design — separating "who regulates," "who researches" and "who launches" among IN-SPACe, ISRO and private players like Skyroot.
Orbital vs Sub-Orbital Launch: The Technical Distinction
A sub-orbital flight crosses the internationally recognised edge of space (the Kármán line, 100 km altitude) but does not attain the horizontal velocity needed to complete a full revolution around Earth before falling back — it follows a parabolic, up-and-down trajectory. An orbital flight must reach "orbital velocity" (roughly 28,000 km/h, or about Mach 23, for low Earth orbit) so that the vehicle's forward motion balances gravitational pull, allowing it to continuously fall around the Earth rather than back to it. Achieving orbit is substantially harder engineering than reaching sub-orbital altitude, since it requires far greater propulsive energy, staging efficiency and precise velocity-vector control.
Key Details
- Skyroot's 2022 Vikram-S flight was sub-orbital: single-stage, solid-fuelled, reaching about 89 km altitude and Mach 5, staying airborne roughly 300 seconds.
- Vikram-1 is designed as a fully orbital, four-stage vehicle, targeting insertion into a stable ~450 km orbit — an entirely different velocity and control regime from Vikram-S.
- Only a small number of countries and private companies worldwide have achieved orbital (as opposed to sub-orbital) launch capability, reflecting the technological gap between the two.
The jump from Vikram-S (sub-orbital, 2022) to Vikram-1 (orbital, 2026) illustrates precisely this distinction — the earlier flight validated structural and propulsion technologies, while the orbital attempt requires an added liquid, restartable upper stage to achieve and circularise orbital velocity.
Launch Vehicle Staging and Propulsion Types
Multi-stage rockets shed spent stages progressively to reduce mass and improve efficiency, per the Tsiolkovsky rocket equation. Stages may use solid propellants (simple, storable, high thrust but not throttleable/restartable — used for the initial high-thrust boost) or liquid propellants (more complex, but throttleable and restartable — suited for the precision manoeuvres needed for final orbital insertion). Composite/carbon-fibre airframes reduce structural mass compared to metallic ones, improving payload-to-orbit efficiency.
Key Details
- Vikram-1's first three stages (Kalam-1200, Kalam-250, Kalam-100) are solid-propellant, providing the initial high-thrust boost through the atmosphere.
- The fourth stage uses a cluster of liquid-propellant Raman engines that can restart and throttle, essential for fine-tuning the final orbit.
- The rocket uses an all-carbon-composite structure and 3D-printed engine components, techniques aimed at cutting build time and structural weight versus conventional metallic launch vehicles.
Vikram-1's solid-then-liquid staging mirrors the standard global pattern (solid boost stages, liquid precision upper stage) used to balance thrust, cost and orbital-insertion accuracy — a design choice UPSC could test by asking why upper stages are typically liquid-fuelled even when lower stages are solid.
Global Significance of Private Orbital-Class Rockets
Until the 2000s, only national space agencies (and a handful of state-backed programmes) could launch orbital rockets. SpaceX's Falcon 1 (2008) was the first privately developed liquid-fuelled rocket to reach orbit, opening a "NewSpace" era of commercial launch providers competing on cost and turnaround time. A successful Vikram-1 orbital flight would make Skyroot the first Indian private company — and one of a small global set of private players — to independently develop and fly an orbital-class launch vehicle, positioning India's private space sector within this commercial small-satellite launch market.
Key Details
- SpaceX's Falcon 1 became the first privately developed rocket to reach orbit in September 2008, after three earlier failures.
- Global private orbital launch providers remain few, dominated by SpaceX, with several other companies (including Rocket Lab) also serving the small-satellite launch segment that Vikram-1 targets.
- Vikram-1 is aimed at rapid, on-demand small-satellite launch services, a niche distinct from ISRO's larger workhorse vehicles like PSLV and GSLV.
A successful orbital flight would place Skyroot among a small global cohort of private companies with independent orbital launch capability, reinforcing India's stated aim of capturing a share of the global small-satellite launch market through private players operating alongside ISRO.
- Vikram-1: four-stage, expendable, carbon-composite orbital rocket, approximately 20 metres tall, 1.7 metres in diameter.
- Stages: three solid-propellant stages (Kalam-1200, Kalam-250, Kalam-100) plus a liquid, restartable fourth stage (Raman engine cluster).
- Mission Aagaman targets a roughly 450 km orbit at 60-degree inclination, launched from the First Launch Pad, SDSC-SHAR, Sriharikota.
- Predecessor flight: Vikram-S (Mission Prarambh), launched November 2022 — India's first private rocket launch, sub-orbital, reaching about 89 km altitude and Mach 5.
- Skyroot Aerospace was founded in 2018 by former ISRO scientists Pawan Kumar Chandana and Naga Bharath Daka.
- Regulatory framework: IN-SPACe (authorisation, set up 2020) and NSIL (commercialisation) operate under the Indian Space Policy 2023, alongside ISRO's continued R&D role.