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Not clear to me from the article - what's the different between an 'open rotor' engine and a turboprop (https://en.wikipedia.org/wiki/Turboprop)? At face value, both seem to be jet engines with propellers used on single-aisle planes?

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There is still a jet stream coming out of the engine propelling the aircraft. Unlike a turboprop where only the propellor generates thrust.

> Unlike a turboprop where only the propellor generates thrust

Each of turbojets, turboprops and turbofans generate thrust with exhaust.

Turboprops have no meaningful thrust component from the exhaust.

Almost. Wikipedia says 10%, which is kinda meaningful but really not much. Even some piston engines (like in WW2 fighters) get 2% or so from exhaust.

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