Seawind with 20B radiator  mounted above the engine at about 20 degrees
above horizontal.  It can be tilted forward or back, but high in the back
(down flow) is the easiest from the cowling point of view.  About 450 sq

in.

of surface area.

Al Gietzen wrote:

Sounds like a configuration that would not give any natural convection air
flow for cooling on the ground; so fan assist is necessary.  Inlet close to
prop and close to prop hub may mask inlet flow.

Front opening would start as a continuation of the spinner shape, about

18

inches wide circling the spinner (big frown) and about 6 inches high in

the

center, slightly more as it follows the spinner outward.  The front edge
would just clear the prop.  Exit would be back past the high point in the
cowling, between large cowl flap and the continuation of the top of the
original structure.

What's the inlet area?  For my Velocity with a 20B at 120 kt climb speed I
calculated 71 sq. in. free stream inlet for 220hp climb on a 90 degree day.
This assumes a 50 degree rise in air temp.  Outlet area should be about 1.6
x inlet.

 Best,
Al Gietzen

 
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