It was derived from the propulsion module which had been used successfully on more than 30 Yantar reconnaissance satellites, leveraging existing equipment and subsystems to minimize new development.
Modifications were limited to updates in command and control systems and adjustments to mechanical and electrical interfaces with payloads.
It featured an in-flight restart capability of up to 50 times, enabling the deployment of multiple satellites into different orbits.
It was powered by S5.144 engine, delivering a vacuum thrust of 2.943 kilonewtons (662 lbf), supported by 16 vernier thrusters for precise flight control.
While its performance was lower than that of the competing Fregat upper stage, the Ikar offered more precise maneuvering capabilities and a longer autonomous operation time.