E-Props propellers have been around for a while now, but has recently hit high levels of popularity due to it's automatic constant speed effect.
But ask 3 pilots how it works, and you get 4 different explanations. While the exact workings is proprietary information, I share what I have found after months of research.
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----Image attribution-----
E-PROPS DURANDAL 80 S-author Anubis2202 (creativecommons.org/licenses/by-sa/3.0/deed.en) cropped + zoomed, overlaid text & arrows
Dowty R391 Advanced Propeller System-author Sanjay Acharya (creativecommons.org/licenses/by-sa/4.0/deed.en) croped + zoomed
Propeller diagram-author nydano (creativecommons.org/licenses/by-sa/2.0/deed.en) no changes
Cessna T182T Cockpit-author Stahlkocher (creativecommons.org/licenses/by-sa/3.0/deed.en) cropped + arrow overlaid
G-DEEZ Denney Kitfox Mk.3-author Aeroprints.com (creativecommons.org/licenses/by-sa/3.0/deed.en) cropped propeller from plane, arrows overlaid
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Crazy STOL Action at EAA Oshkosh 2022 by RRiner (ua-cam.com/video/e6RPz9onFZg/v-deo.html), license CC-BY
Chapters:
0:00 What is an E-Props Propeller?
0:34 Disclaimer
1:00 Prop Angle of Attack Basics (Don't Skip)
4:59 Extended Speed Range (ESR)
6:58 Alternative Way to Achieve ESR
13:26 Further Extending Speed Range