[cymbeline]

“Chain drive 1-4 % friction loss.

Shafts about 20-25 % friction loss.”

Ouch! There are a lot of bevel gear assemblies out there. Those must be more efficient.

https://www.surpluscenter.com/Power-Transmission/Gear-Reducers-Gearboxes/Gearboxes/

Also see power transmission category on the site.

[Scrambler Bob]

Ouch! There are a lot of bevel gear assemblies out there. Those must be more efficient.
= = =

Like there are a lot of democrats out there, they must be more efficient.

Bevel gears have other positive uses, like changing direction, and size and space limitations. The friction loss is a trade-off.