Eric,

If I understand your comments in this thread, you have the capability to
test props and prop configurations.  Have you researched the Kline Fogleman
air foil?  http://www.rexresearch.com/klinfogl/klinfogl.htm  It would be
interesting for someone with testing capability to apply this to a ducted
fan configuration.  The airfoil configuration could be applied to both the
prop and the fairing.

However, if one was able to eek out an additional 10% efficiency out of the
prop and another 10% out of the fairing, that still would give you a Lambda
i of only 7.2.  Is that enough to get you where you need to be?  If so, it
might be worth experimenting.

Gordon

It has been around since 1984. How come I don't see it on any airplanes?

Paul Lamar



Hmm.  No mention of Reynolds number, even though the data was taken on
scale models.  Where's the L/D, and lift coefficient and alpha plots?
A bit short "real" aerodynamic discussion..


Matt-