Simorgh (rocket)

Simorgh is a two-stage liquid-fueled rocket developed from the Safir rocket. It is able to place a payload into a circular low Earth orbit (LEO). It is also the first Iranian rocket that can place multiple payloads into orbit (e.g., one main payload and several secondary cubesats). In comparison, the Safir was only able to place a 50 kg payload into a 250x375 km elliptic orbit. The Simorgh rocket is long, and has a launch mass of . Its first stage, with a diameter of 2.4 meters, is powered by a cluster of four synchronized Safir-1B first-stage engines with four separate turbopumps, each of these engines generating up to of thrust. The first stage also utilizes a set of four vernier engines sharing a single turbopump used for attitude control and providing an additional . At liftoff, these engines generate a total of thrust. The second stage with a diameter of 1.5 meters utilizes a set of four smaller engines similar to the two engines of Safir's second stage. These produce a total of thrust. The Simorgh's total flight time to a 500-530km orbit is between 480 and 495 seconds. Stages separation takes place at an altitude of 90 km and a velocity of 2300 m/s. The fairing shroud is ejected simultaneously with the second stage engine's ignition. The satellite is then accelerated to 7400 m/s and injected into its designated orbit. == Reliability ==

The development of the Simorgh has been marked with difficulties and unreliability of certain sub-systems due to the overcomplexity of its engines and turbopumps. Out of the system's first four launches (two orbital and two sub-orbital launches) there have been three failures, giving the rocket a reliability rating of twenty five percent. There were however, indications of progressive improvements to the design and reliability of the system with each successive launch; with the 2017 launch operating for 120 seconds before failure, the 2019 launch operating 450 seconds before failure, and the 2020 launch operating correctly for 475 seconds out of the 490 seconds of operation required for a successful mission, giving the missions a 25, 92, 97, percent success rate respectively, indicating a trend of increasing reliability in the design. == Launch history ==

File:Simorgh Payam launch 08.jpg|Simorgh during the launch of Payam satellite on 15 January 2021 File:Simorgh Payam launch FARS 07.jpg|Simorgh during launch preparations File:Simorgh Payam launch 06.jpg|Simorgh in its servicing tower == See also ==