The genetic algorithm (GA) is a computational model of natural selection and reproduction displayed by biological populations. The capabilities of GAs as search and optimization methods make them well suited to perform conceptual design tasks. A GA has been developed and combined with an industry standard sizing code specifically for helicopter conceptual design. This GA-based program was used to generate conceptual designs for three helicopter missions. Results of these efforts are discussed, providing insight into the ability of the GA to perform helicopter conceptual design.