Recent design concepts for future inter-planetary NASA spacecraft have included a hopper capability by which the spacecraft will be able to move about the surface of a planet, moon, or asteroid by restarting its propulsion system and flying to another location. To participate in the development of the technology needed for this new capability, a series of hopper spacecraft simulators have been designed and built by several students at Lehigh University with funding from the Pennsylvania Space Grant Consortium and the Lehigh University Undergraduate Laboratory Enhancement Program. Specifically, the Hopper Spacecraft Simulator program is focused on designing, building, and testing quadrotors and hexacopters that can be used to simulate the dynamics of a spacecraft landing on a planet or moon. A primary goal is to develop guidance systems that will optimize fuel consumption in real time.