Last build day I hacked together a thruster testing stand out of paint sticks and a packaging scale to measure bollard pull. I decided to make a more robust and better version of it out of laser cut acrylic which would also have mounts for attaching different types of nozzles. The goal is to build up a testing stand that would enable the simultaneous capture of bollard pull, motor rpm, and ESC voltage and current (for power). With this setup, we would be able to characterize motor, propeller, and nozzle efficiency curves, and quantify our propulsion analyses to help drive better design.
The CAD files for the testing stand are here:CAD and laser files
I'm using a kitchen scale to measure the bollard pull; both lever arm lengths are 500mm.
The L-arm is held together with 4x M5x25 bolts
The base is held together with 3x M5 threaded rod, with one of them acting as the pivot point.