Chris,

 

It is interesting that Lance chose -7 degrees rather than the -10 seen in chart 2.  Perhaps the pitching moment is too great at -10.  Note that Larry Henney claims max speed at 3 degrees higher than the faired position I.E. -10 degrees.  However, in that configuration his elevator horns are sticking above the horizontal stab (significant down elevator).  It is difficult to overcome the extra nose up pitch. 

 

Scott

 

<<Fortunately, doing what is required for structural reasons also makes the airplane go fast by reducing the otherwise high trim-drag.>>

 

Dan, et al

The attached excerpts show another key reason for the reflex.  Our planes are too fast for this airfoil without using reflex.  Reflex repositions the drag bucket to coincide with our cruise speeds.  The paper on the NLF 0215 describes how this feature was built in from right from the start.  

 

Chris Zavatson  

N91CZ

360std

www.N91CZ.com

 

 

--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html