the Jupiter-I was a massive behemoth, and seemed capable of achieving any orbit desired. however, like the Venture line before it, the Jupiter line was to suffer its share of problems. the prototype collapsed on the pad, as the main thruster pods proved incapable of supporting the beast\'s massive weight. the Jupiter-II would fail to leave the launch pad, proving the generated thrust insufficient to lift the craft. the original, behemoth design was then scrapped, and a new chassis built from the ground up. this new design would be designated the \'Jupiter-III,\' and suffered a critical structural failure prior to launch. the Jupiter-IV, on the other hand, was the Mechlab\'s first taste of success since the ATLAS-I, and achieved and altitude of almost 5000 meters before tilting inexorably towards Kearth for unknown reasons. if the issue could be corrected, the scientists announced, it would be capable of achieving heavy payload lift easily. the Jupiter-V was largely unchanged from its previous incarnation, save the addition of numerous stabilizing fins in an attempt to eleiminate the \'list\' that had been a problem in the IV. these measures would alleviate, but not eliminate, the list, and the mark-V successfully flew on-course up to 8000 meters before once again listing to one side. thinking the craft\'s \'top-heavy\'-ness was to blame for the tilt, several of the redundant stages were removed from the Jupiter-VI. this seemed to help, as the craft was almost capable of entering Kearth\'s Exosphere before the list forsed it bact to landing. the Jupiter-VII would use a larger, more robust engine in an attempt to \'out-power\' the list, in order to make the persistent problem into a feature that would put the craft on an \'orbit course\' without Kerbal or computer input. however, this attempt also met with failure, and the team began re-examining the design en tota to spot flaws they may have missed. the thruster design was redone for a proposed \'Jupiter-VIII,\' but was never completed as the company briefly lost the contract to Jebidiah LTD, who offered their own \'V-1\' design. Mechworks Aerospace won the contract back after Jebidiah LTD\'s payloadless craft suffered a string of spectacular failures, and turned back to their only successful design; the ATLAS, which by that point had become the staple of KSP\'s launch capacity.