The CZ-5-5.0 heavy launcher would use the 5.0 m core stage together with a number of modular 2.25 m or 3.35 m diameter stages as strap-ons. Maximum payload with four 3.35 m diameter strap-ons is given as 23 tonnes to low earth orbit or 11 tonnes to geosynchronous transfer orbit. Lower payloads could be achieved by using 2 x 2.25 m plus 2 x 3.35 m strap-on stages; four x 2.25 m strap-on stages, or two of either stage. Growth to 40 tonnes payload would be possible if eight 3.35 m strap-ons could be used. The CZ-5 core stage is similar in dimensions and mass to the Ariane 5 core, but powered by four engines instead of the single engine used in Ariane. More about these launchers can be found here: