Quote:
Had to look up fineness ratio...
...
My goal in this discussion is to understand the principles and optimum approaches, regardless...
|
You went right to private tutoring from aerohead. That's a good start.
Have you looked at his public albums?
Here's mine, some of the stuff he posted plus others of interest to me.
_________
semipermeable box cavity
You can think of a box cavity as a boattail that is cut off and not filled in. They tend to be short as in this example, but on truck trailers they will be 2ft deep. The interesting thing is that they can be inset or stepped in, instead of following the Template line as long as they terminate on that line. This could be helpful for clearing taillights.
The semipermeable refers to a perforated surface. This could mean 400 louvers on a '34 Ford roadster body, or the Mesh panels on the tail of a modern supercar. Here's an example of using a fabric mesh to affect turbulence and wind noise without adding drag:
