Our laboratory studies space propulsion devices and thrust measurement method. For space propulsion, we focus on small thrusters for spacecraft, and covers both chemical and electric propulsion. Additionally, thrust measurement method is designed to accurately evaluate thrust with relatively high frequency thrust variation, since accurate evaluation of thrust is indispensable to develop thrusters. To develop advanced space propulsion and thrust measurement method, we propose original concepts and evaluate performance by try and errors; brushing up ideas through discussion and analysis including CFD and FEM, designing prototypes, and testing them. Hence, students carefully design and fabricate their prototypes using manufacturing machinery in the factory at Tokyo Metropolitan University. Moreover, we sometimes make measurement apparatus such as high voltage and current measurement device by ourselves. Since most of experimental devices used in the experiment have been studied for long time, their making has no originality. Nevertheless, making processes for both prototypes showing the effectiveness of original ideas and conventional experimental apparatus require our diligence and perseverance, and accordingly student can learn how to create something. Through try and error, students enhance not only the performance of thrusters and thrust measurement method, but also develop their professional experience and abilities in various fields: mechanics, electronics, and computer programming.