Bob Darrah wrote:

I built a radiator duct test stand very similar to what Paul just described.
Used a squirrel cage blower for air.  It is slow so I don't know if this
info is transferable to our needs.  Used a weighted piece of paper (one end)
to get relative flow over the surface.
     Got even flow 2/3 down toward the pointed end.  A short area there was
no flow, but it picked up again near the pointed end.
     Pushed up on the duct in the area of no flow 1/8 inch (yes, ONE EIGHTH
INCH) and the flow smoothed out beautifully. Pushed up another 1/8 inch and
the flow doubled in that area, but at the expense of the pointed end.
     I am still amazed that that little bit of duct change had such great
effect!

FWIW

Bob Darrah

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site. Copyright 1998-2002 All world wide rights reserved.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org