We evaluate the performance of hypercubes on a computational fluid dynamics problem and con-sider the parallel environment issues that must be addressed, such as algorithm changes, implementation choices, programming effort, and programming environment. Our evaluation focuses on a widely used fluid dynamics code, FLO52, written by Antony Jameson, which solves the two-dimensional steady Eu-ler ... [Show full abstract] equations describing flow around an airfoil. We describe our code development experience, includ-ing interacting with the operating system, utilizing the message-passing communication system, and code modifications necessary to increase parallel efficiency. Results from two hypercube parallel computers (a 16-node iPSC/2, and a 512-node NCUBE/ten) will be discussed and compared. In addition, we develop a mathematical model of the execution time as a function of several machine and algorithm parameters. This model accurately predicts the actual run times obtained and is used to explore the performance of the code in interesting but not yet physically realizable regions of the parameter space. Based on this model, predictions about future hypercubes are made.