In the decade I've been a member of this community I have learned a tremendous amount of information relating not only to, most obviously, model cars and model building in general but also automotive history and engineering, physics, a bit of chemistry and even marketing. To that list I can now add aeronautical engineering.
Though it seems obvious now, the concept that a propeller blade would have a specific directional structure had not occurred to me. My thought was if the direction of operation were reversed, the action, force and work energy would also reverse. After a little independent study on the physics and operation of aircraft propellers I learned that in prototypical operation most modern propellers have a variable pitch adjustment which essentially allows them to reverse operational direction while maintaining the same direction of rotation. This allows for pushing air forward of the aircraft, acting as a type of brake, rather than pulling it toward the aircraft to cause acceleration and create lift.
So what does all this mean? Essentially nothing aside from giving me a somewhat rational explanation for how this whole irrational combination might reasonably function. Q: "So if the propeller turns in reverse, how do they get forward motion?" A: "They vary the pitch." I almost forgot to mention that I've worked in a transfer case between the rotary engine and the VW trans-axle to drive the road wheels.
Besides, the way the propeller blades are formed to accommodate the shroud, I don't believe that simply flipping them over and mounting them would work without significant alteration or complete re-fabrication. Either it's a bit more work than I want to do for this goofy mash-up.
So, after a bit of thought, I've decided that I can live with the prop the way it is.
Now, on with the show!
These air scoops are among the custom bits provided in the kit. Though I don't recall ever seeing an old Bug with anything like in place, I plan to use them for their intended purpose.
In its usual configuration, a radial engine of this type is cooled mainly with the air rammed through it by the prop. Since this engine is in the rear and running the prop as a pusher instead of a tractor, the prop would have to pull air through the engine for cooling. All that air would have to come from somewhere and I think the scoops would help with that.
The air collector will be attached via tubes to the window scoops. The box will house the "avionics controls".
As always, thanks for taking the time to look and please feel free to comment.