Paul,
Thank you, that makes very interesting reading. Voyager had a NACA duct
on the bottom of the fuselage for the rear engine but it has a "ramp"
that could be extended into the slipstream for increased airflow for
takeoff and climb then retracted in cruise to reduce drag and where
cooling isn't as critical. Do you think that method would work better
in my application? The "standard" method of cooling the Honda powered
BD-5 is with a belly scoop. It is big, ugly and causes a lot of drag.
I'd hate to go back to that configuration.
Regards,
John Lewis
N501BD

Just about anything would be an improvement but it is best to use P51 type ram air
scoops that far back on the fuse.

Paul Lamar
 
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