Secondary Side Considerations for the BOLT Flight Experiment

The Boundary Layer Transition (BOLT) Flight Experiment is preparing for launch in the Spring of 2020. Final designs decisions have been made to allow fabrication of hardware. The secondary side experiment, which was initially proposed to be a roughness experiment, was selected instead to be an investigation of step effects to provide better synergy with the primary side. Numerous design decisions have influenced the decision to revise and refine the goal of the secondary side, which is now to investigate the effects of rearward-facing steps. The present paper focused on the BOLT secondary side flight experiment, providing details of the key inputs and decisions made to finalize the flight vehicle and instrumentation.