REFLECTOR: Oil cooler NACA duct

[Dave Philipsen]

I am trying to improve my oil cooling a bit and was looking over the 
front NACA duct/oil cooler.  Just inside the aft end of the duct on the 
floor of the fuselage is a "bump" that is about 3/8-1/2" tall and 
extends across the width of the duct.  To me, it doesn't seem like it 
should be there.  It appears that it would impair the smooth flow of air 
but maybe it is designed that way on purpose.  Does anyone know if this 
is correct?


Dave Philipsen
Velocity STD-FG
N83DP