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Following the objectives of the European Space Agency, specific studies have been performed concerning a Crew Transport Vehicle (CTV) based on the Ariane 5 launcher. This vehicle is designed to transport a maximum crew of 4 members to/from the International Space Station, with a limited amount of payloads. It is mainly composed of: Crew Module (CM), capable of withstanding the severe environmental conditions of the atmospheric re-entry, offering an adequate habitable environment for the crew all mission time long. Resource Module (RM), where most of provisions and electrical equipment (e.g. batteries) supporting the vehicle orbital life is stored; the truncated cone shape external surface of RM is entirely exploited for mounting dedicated fluid radiators. Transfer Vehicle (TV), a propulsion module designed to supply means and resources for the vehicle orbital manoeuvres and attitude control from launcher separation up to de-orbitation, when the RM + TV composite is jettisoned.