Perry Mick wrote:

Paul:

That previous picture I sent you of the streamlined hub and thin duct
was actually based on my current 37.5 inch fan.  This is the drawing of
my proposed 33 inch fan for 6500 RPM.  Looks pretty darn small.

I've had this idea for awhile of putting slots in the leading edge of
the
duct, like slats on wings.  The fan could draw in air from these slots
during low speed but as speed increased the slots would be bypassed.
If it works I love it because no moving parts or linkages.  What do
you think?

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

You are in good company with this idea Perry. Both the B52, C141 and the Galaxy
C5 use slots in the duct and blow in doors to enhance the slow speed thrust. 
Here are pictures of the B52 version.

I think my idea of large inflatable rubber lip... sort of like a big de-ice boot
would work even better. Could be made from  a truck tire inner tube.

Paul Lamar
 
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