I suspect this is an error in the VEX manuals. But I’m sitting here reading that changing the 393 to “High Speed Mode” results in only 64% efficiency. But I’ve read people saying this method is much more efficient than using gears or similar. Do we really lose 36% of our efficiency by switching to “High Speed Mode”? That seems rather dismal, but it is what VEX has written.
However, that could be a mistake by someone who didn’t understand their math doing the typing/editing. What I’m reading explicitly says it “provides 60% faster rotational speed with a 60% reduction in torque.” Let’s call the original angular speed w, the original torque T (using Latin letters that look like the standard Greek because I’m not sure about fonts on the forum), and the original power P=wT. That means the new values are 1.6w and 0.4T. That means the new power is (1.6w)(0.4T)=0.64P.
So I’m stuck wondering if these are really so inefficient or if there is something wrong with what VEX wrote about their own motor. If there is something wrong with what VEX wrote, which part is in error (angular speed or torque or both)?
If the conclusion is there is some sort of error, I’ll post a refined message in the official forum for VEX to help them edit.