Al,

Its been hard to get good photos of this, because the lower cowling makes up a good portion of the airflow path.  Basically I have a standard Cozy NACA scoop, with the oil cooler and radiator sitting flat, end-to-end beneath the engine mount.

 

I have a curved deflector on the oil cooler to help the air make the turn up and through the oil cooler.  I have another one of those deflectors on the radiator about half way back. 

 

The downside to this design, is that it takes pressure to make the air turn, and go up through the radiators.  The NACA does not work well that way.

 

What I’m trying to do is augment the existing scoop, with a “bolt on” scoop ahead of it, which will capture air outside of the boundary layer, i.e. high speed air, to improve cooling.

 

I made a scoop first, that while it worked somewhat, does not exclude the boundary layer air.  Also it’s kind of like a funnel, with the largest are at the opening and tapering down into the existing scoop.

 

I hope that makes some sense.

 

I think I’ve got it.  Am I right that the x-sectional area of the flow ducting is always increasing?

 

Al