Quote:
Originally Posted by i_am_socket
I would think that the difference of hub cap design would depend on the vehicle in question. Has anybody seen tuft testing done for stock vs disc on a particular vehicle? Has anybody seen windtunnel tests at highway speeds for the same?
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I'm not sure what the yarn would look like on a moon disc. But my guess is,
it would lay down in a spiral and maybe outwards towards the tips.
Depending on the yarn's weight or if a
circular laminar air layer would exist on the surface of the disc.?.
Maybe do it small scale with a drill and sanding disk?
Or glue a 14" coroplas disk on top of the sanding disk?
Somewhere, I've seen spinning disks where paint (in the center) flowed out to the edges, but I can't recall what the results looked like!
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Would the wheels need to be spinning while the car was in a wind tunnel??
I think some wheels are designed to allow air to flow over disk brakes, for cooling. Maybe even force the air around the discs. With spokes acting like fan blades.
I wonder what mine are doing with the air?
Does centrifugal force (in the middle inside) fling air towards the outside of the rim? Where it exits out those 8 holes? Where it will have a dirtying effect on the air flow passing by the car?
I'm just trying to imagine what the turbulence and drag would be like, if I cut a round 2" hole in the vertical stabilizer on a model RC glider??
I'm almost positive it would have a very detrimental effect on airspeed, and the amount of control provided by the rudder..
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I've seen pictures of those little Honda hub holes being taped over.. I'll bet there is some small positive affect.
Now I'm wondering if Zig-Zag tape just forward of the wheel wells would do anything for the cd.?.
Cheers,
Rich