NACA Ducts

[Turtle TR]

Anyone know the formula to sizing them? I've searched and searched around over on google and came up on illustrations on NACA ducts, but never a way to size them.

Thanks

 

[Turtle TR]

? Anyone ?

 

[Freedster]

Here's some of the math behind it:

http://naca.larc.nasa.gov/reports/1948/naca-rm-a7i30/

Ugh. Here's some drawings on this page:

http://www.wisil.recumbents.com/wisil/nacaduct/naca-duct.htm

Those are reprinted from the NACA archives, but I couldn't find the originals.

Let me know if those don't fill the bill, I can look elsewhere.

- Freed