ORIGINAL: Xairflyer
Done a lot of searching on the net and very surprised that I cant come up with any pics of N146CM only one I found was below.
There are plenty of the Red Baron Super Stearmans but none of N146CM which makes you wonder how GP came to choose this version.
Note that N146CM uses the more conventional spinner nut rather than the big round spinner as in the kit and on the Red Baron Stearmans. I personally love the shape of the big spinner looks much better.
Its actually not a spinner but a giant machined cover made of thick cast aluminum. It retains the gearing and a large spring inside that force the blades to what we know as flat pitch. When the engine is running, engine oil pressure is pumped into a cavity/cylinder (much like a hydraulic ram) against the spring that is within this hub and that creates the desired "pitch" the pilot selects for the flight condition. The other is an true "spinner" if you will to aid aerodynamically....that would actually cover the above mentioned assembly.
Not trying to be a "know it all" but have as a mechanic I have disassebled my share of these.
The spinner the GP Super Stearman comes with is actually inaccurate if that is the actual plane they were modeling...a hub spinner would be much more accurate.
Paul