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[–] 4 pts

In actuality this will probably just give a 5-10%

Check the video (again). The efficiency is factually up to 205% for IRL tests.

[–] 2 pts (edited )

OK, at 2:55 there is an impressive +105% gain in efficiency at ~4000 RPM for the motorboat. So basically you can run at 4000 RPM instea I'm impressed.

[–] 1 pt

I’m impressed by my lack of understanding what efficiency means.

Makes sense.

[–] 1 pt (edited )

It's what the guy in the video says. 0.38+0.38*1.05 = ~0.78, which is what the graph shows at 4000 RPM. Obviously the +105% is relative to the base. Which is just a roundabout way of saying double the efficiency, twice the useful work with the same energy input.

Maybe you meant my original 10-20%. I didn't even get to the graph, I just know how many videos on YouTube push something as a game-changer when it's not. I had also seen a critique video about the MIT one he references.