Hi Ed,

I have also read this many times but have never seen a boundary layer bleed on a BF-109.  I have considered method this for my RV-4 and looked at many pictures of the 109.  Attached is a picture of an 'F' model.

Ken Powell

snip.....

 >One  article I read indicated the American P-51 and German fighter designers
> figured out the significance of keeping the boundary layer out of the
> cooling ducts whereas the British supposedly continued to be plagued with
> cooling problems with the Spitfires due to their cooling inlets being partly
> in the boundary layer. FWIW
>
> Keep us apprised
>
> Ed