| Summary: | In the early stages of maturity of a system built for a specific function, it is common for the solutions to lie in a broad architectural space, in which numerous concepts are being developed, built, and tested. As the product matures, certain concepts become more dominant. This pattern can currently be observed in the suborbital tourism industry, in which the obvious question is what system architecture will provide the best combination of cost and safety and in the long run become the dominant architecture. This paper addresses this question by defining a broad architectural space of thousands of possibilities and exploring it comprehensively. We identified 33 feasible architectures, 26 of which had not been proposed earlier. A genetic algorithm optimizes each architecture with respect to the launch mass (a proxy for cost) and operational safety. The launch mass has been calculated in a design analysis framework consisting of four modules: weight/size, propulsion, aerodynamics, and trajectory. A validation of this framework shows relative differences below 7%. A quantitative safety analysis is developed and validated with a survey of 11 leading experts. We identify six dominant architectures. These form a set from which optimal variants are likely to come.
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