The objection to diesel engines to date has been their greater weight compared to AVGAS ones. Building on automotive developments leading to simpler and lighter-weight gearboxes and advances in engine technology, EINSTAIN saw a path forward for diesel engines. According to Amedeo Fogliano of TECNAM, project coordinator, “the most unexpected challenge was minimising lift and drag given the huge impact on weight of the frontal section inlets due to increased heat exchange requirements.” In the end, overcoming this challenge led the team to surpass original goals. Achieving required engine mount sizing and simulation of inlet flow to improve the design led to significantly enhanced knowledge of modal analysis and heat exchange. A multidisciplinary approach with a numerical-experimental analysis enabled the team to keep performance up and weight down.