I am a fan of "More information is better". I believe that torque can be used to calculate system efficiency. I just do not know what those calculations are. I have seen one commercial thrust stand like your concept/design that includes one or two load cells that measure torque. I do not believe that measuring torque would be included in that thrust stand if there was no merit in it. Look at this similar thrust stand which also comes with data collection and reporting software. It is linked to a computer through a USB: [RC Benchmark Thrust Stand][1] It does not use a linear bearing. I like your concept very much.

I encourage you in your quest for a deeper understanding of the entire performance characteristics of your drone design. I would have a use for a sophisticated thrust stand like yours. [1]: https://www.rcgroups.com/forums/showthread.php?2611223-RCBenchMark-USB-Thrust-Stand

I am a fan of "More information is better". I believe that torque can be used to calculate system efficiency. I just do not know what those calculations are. I have seen one commercial thrust stand like your concept/design that includes one or two load cells that measure torque. I do not believe that measuring torque would be included in that thrust stand if there was no merit in it. Look at this similar thrust stand which also comes with data collection and reporting software. It is linked to a computer through a USB: RC Benchmark Thrust Stand It does not use a linear bearing. I like your concept very much.

I encourage you in your quest for a deeper understanding of the entire performance characteristics of your drone design. I would have a use for a sophisticated thrust stand like yours.