Let's take a look at Iranian upcoming rocket : Simorgh - - - Updated - - - Overall length of vehicle: 25974 mm Length first stage: 17816 mm (first stage with forward adapter) Length second stage: 8158 mm (second stage with fairing) First stage diameter: 2.40 m Second stage diameter: 1.50 m First stage thrust: 142 tons (4 x 35.5) Second stage thrust: 7.2 tonnes - - - Updated - - - - - - Updated - - - - - - Updated - - - - - - Updated - - - There is a point here ! Here is R-7 Derivatives : Samara - - - Updated - - - Kometa - - - Updated - - - Adler & Aldan