Bragging rights are not exactly what [Jeremy Fielding] has in mind for his DIY dynamometer, nor is getting the particulars on a big Detroit V8 engine. Rather, he wants to characterize small- to ...

The dynamometer outputs a chart that looks like this. On it, two lines are plotted: a line for torque and another for horsepower. Peak torque is where the engine produced the most force.

That’s the idea behind [Michal]’s Automated RC Motor Efficiency Tester, his entry to the 2016 Hackaday Prize. [Michal]’s project is not a dynamometer, the device you should use if you’re ...