Its a fairing based propeller.
basically when I launch it (and i tried it with other propellers too, like the Comet Mk3 from "Squiddy" on youtube) and i press Alt + E, i can see the Roll meter go up in the bottom left corner.
When i then decouple the engine it spins rapidly and my plane and the propellers move sort of like they should.
But when i decouple first and then press Alt + E, nothing happens.
it kind of feels like a fault with some of the settings, since i have the same exact problem with propeller planes from other people.