Newbie alert to start out here-- I have only 15 hours on my new-to-me Sky Raider. I have the 2.58:1 B box on my Rotax 503, with a Powerfin 66" two-blade ground-adjustable prop. I understand the PSRU box has a centrifugal clutch inside. Is it the RK400C clutch? I don't understand why my prop doesn't freewheel with the engine shut down. In fact, it feels like I can pull the prop through the compression cycle to reorient the blade position. How does this work? I'm used to Lycomings and Continentals, so this is new to me.