Hi, I am a plastic modeler and I would like to build a scale model of a Boeing JB-17 with the Pratt & Whitney XT34 engine. I have seen photos of the JB-17 with XT34, and I am curious about a "ring" behind the propeller, visible through the engine cowling (see attached photo from this same forum, from NARA). The arrow in the edited photo indicates this "ring". Also, if anyone has pictures showing details of the front of the XT34 engine (as used in the JB-17), and details of the propeller hub, I'll be very grateful.