V1.8.1 You've likely heard of Project Orion - the incredibly metal spacecraft propulsion concept from the '60s that involved surfing on the wake of serial nuclear explosions - but Project Orion wasn't just the eponymous engine; it was an entire vehicle concept study to construct a fleet of Orion powered spacecraft variants to explore and utilize the local Solar System - Luna, Mars, even Jupiter or Saturn and their extensive moon systems. What this mod does is bring Project Orion to KSP. Par