Diameter of stage 1: 2.4m
Gross weight: 85 tons
Four auxiliary engines are located between the four main engines of the first stage (The first stage was steered not by jet vanes) . They each produce 3.75 tons of thrust and can rotate ± 36˚ to control the direction of the rocket.
Fuel : UDMH
Oxidizer : N2O4 / AK-27I ???
Simorgh-A used four 35.5 (37) -ton Safir-B1 SLV engines as expected, and uses four auxiliary engines each with 3.75 tons of thrust, for a total of 157 (163) -tons of thrust for the engine. The auxiliary engines enhance the thrust and control the direction of the rocket.