Jerry Hey wrote:

What is the recommended radiator core volume for a normally aspirated
13-B?   The radiator will be mounted in the fuselage (Tailwind) with
plenty of room for adequate size and away from engine/exhaust heat.
Currently I am mocking up for a 24 x 14 x 2  (672 cu in), not
including the end tanks.   Thanks,  Jerry Hey

That sounds like it should work Jerry.
Our current best guess is 600 to 800 cubic inches.
If you want air to go through it at low speed such as takeoff and climb
keep it thin. Say one or two inches.

The duct shape and size in and out is extremely important.
Sealing the inlet duct is also extremely important.

A NACA duct on the bottom of the fuselage starting as far
forward as possible minimizes drag and maximizes air inlet when
the air speed is low and the angle of attack is relatively high.

The area under the stabilizer is normally a low pressure area so
that is a good place for rad air out lets. Use cowl flaps there 
but carefully check them for their affects on elevator authority if any.
You might want to close them before landing.

Paul Lamar
 
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