This website has some nice explanations and GIFs: https://s2.smu.edu/propulsion/...

Ajedi32 · 2026-02-03T20:24:49 1770150289

So the "open rotor" engine is actually a propfan engine?

nickff · 2026-02-03T20:41:17 1770151277

Essentially yes, different engine companies have used different nomenclature over time. It seems that the "open rotor" terminology is being used to emphasize the improvements which have been made to blade design, noise, and general efficiency.

game_the0ry · 2026-02-03T19:40:15 1770147615

The inner nerd in me is so satisfied. Thanks for the link.

jiehong · 2026-02-03T20:06:56 1770149216

That website it gold!