Greg has implemented excellent scoops & ducting for all three radiators.

John Slade wrote:

Paul,
Those ducts are huge and very draggy. I know Greg plans to reduce them.
While we're talking about cooling, I'm planning at approaching the problem
in the other direction - i.e. start with the plans 14.5 * 4.5 NACA and then
add whatever I need. I'm making the cowling now and seem to remember that
the rule of thumb for outlet vents is 2/3 the size of the inlet - i.e. 43.5
sq inches in my case, or 22 sq inches per side.  Is this right?
John Slade

The question is; Will Greg's still cool at 300 HP? 

About 125% or 150% larger than the scoop openings. Not 2/3 rds.
Make two round openings back by the front of the prop.

Paul Lamar
 
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