This thing is a stand to test the performance of different combinations of motors, propellers and batteries used in model aircraft like quadcopters. The stand is intended to be used with a digital scale to measure the thrust produced by the motor. Thrust is measured as the motor forces the probe of the stand down on to the digital scale.
Necessary Hardware Sourced from McMaster Carr:
Standoff: Catalog #93330A450 (x1)
Screws: Catalog #91735A104 (x2)
Recommended Digital Scale Sourced from Amazon
Scale: ASIN #B003MSZBSI
The test stand is laser cut from 3mm acrylic and assembled with a solvent. Source files including the vector templates used by Ponoko for laser cutting services are included.