Re: Europa-List: FW: New 914 Exhuast muffler and tailpipe

[Gilles Thesee <Gilles.Thesee@acgrenoble.fr>]

> Answer to both...got a wind tunnel?  :-)
>
> It's a real skinny pipe, so ain't talking much.

You can have a rough estimate. See Hoerner's book 'Fluid dynamic drag'.

 But a round pipe
> angled becomes a messy oval for less drag, as you implied.  As I look
> at various production aircraft, seems they either don't care or know
> why they shouldn't care.
>

They actually don't care because they don't know why they sould ;-)
Drag reduction or internal flow dynamics is now a forgotten lore among light
aircraft manufacturers.

Regards,

Gilles Thesee
Grenoble, France