Those 4b paddles on RB are a later design than the ones on the 47n and some retrofitted D models in Europe. The old ww2 paddles had round ends, with the same width chord to a short taper into the hub assy, looked a lot like an old style canoe paddle, thus the name. RB's props look like the props on Stallions and Helio Couriers and all those other vstol turboprop cargo utes like they used in late Nam, the stepchildren of Beavers. Those had the benefit of computer aided designs, and are much more refined in an aerodynamic sense.

One "story" from Euro in ww2. The Spitfire could outclimb a 47 like it was standing still, until the 47 got the paddle props instead of the 3 blade pretty prop. The 47 was a lot faster in a straight line. As fighter pilots are wont to do, the Brits liked to make a pass at the "friendly" Yanks in the 7 ton milk bottle 47's, and then climb away untouchable, laughing all the way. They did this to Gabby Zabreski, the 47 ace, just after his squadron got the paddle props and water meth injection. The 47 passed the climbing Spit like it was parked, and swatted it with the prop wash from that 13' diameter paddle prop.

The 47 is a lot lower pitched than the inline 51 or 38 water cooled motors, and swings a larger prop at lower rpms (the inline motors usually have a gearbox for the prop, and the corncobs put the prop on the crankshaft. I do not know how they have modifed the powerplants and drivelines on either.

The only thing I've heard that is close to a 47 is a hellcat or bearcat. I had the opportunity to see a pair of matched F8F Bearcats at an airshow once. One of these later continued vfr flight into ifr conditions, and the thunderstorm spit out a shower of blue and gold duralum confetti and one big ole corncob into a soybean field in TN somewhere. They were owned by a pair of brothers who owned the Nashville Tennessean and the Memphis Commercial Appeal.