> Last time I took a piece of paper, held it on edge in both hands in front of my face and blew hard, it buzzed like...well a piece of paper with high velocity air going across it with the
     leading
     > edge oscillating up and down relative to the incoming air!  Perhaps one ought to look at the NACA/NASA cowl leading edges??  Either REALLY stiff or blunted leading edge.
     >
     > If not....that edge could resonate to failure in pretty short order or at the very least create a buzzzzzzing sound over the airport that will bring lots of heads out of hangars to
     observe the
     > phenomenon.  The theory is pretty simple, but the paper test is a lot quicker.

Thats just a small part of it. A Long or Vari-Ez driver had done a lot of testing and found that the aitfoil on that edge was critical.. just throwing on a sheet of aluminum may yield an improvement
over having nothing there at all but tests proved that the shape of that edge was important.

...Chrissi

www.CozyGirrrl.com
Cozy Mk-IV RG 13B-turbo
Plans #957 Chapter? big pieces done, details, details

 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net            
Copyright 1998-2005 All world wide rights reserved.