Paul,

Attached is a picture of a crossflow radiator like I was considering.
Notice that the tanks are on the ends rather than on top/bottom
configuration.  This one is for a Lincoln (model not specified).  Here are
the specs per the Summit Racing web site.  Something around this size could
be made to fit in a fore/aft configuration inside my Lancair cowl.  I was
thinking of converting two of these into a cross-counterflow design.  Two
of
these would give 2.7 cu. in. of core per hp.  The question is would two 7"
inlets (77 sq. in.) feed enough air to cool 375 hp?

  Brand

 Proliance Ready
Rad<http://www.summitracing.com/search/Brand/Proliance-Ready-Rad/
 Manufacturer's Part Number

 431393
 Part Type

 Radiators <http://www.summitracing.com/search/Part-Type/Radiators/
 Product Line

 Proliance Ready-Rad
Radiators<
http://www.summitracing.com/search/Brand/Proliance-Ready-Rad/Product-Line/Proliance-Ready-Rad-Radiators/?autoview=SKU

 Summit Racing Part Number

 *PLI-431393*



 Radiator Style

 Crossflow
 Row Quantity

 Single-row
 Radiator Finish

 Natural
 Radiator Material

 Aluminum/Plastic
 Transmission Cooler

 No
 Inlet Location

 Upper driver side
 Inlet Size

 1 1/2 in.
 Outlet Location

 Lower passenger side
 Outlet Size

 1 1/2 in.
 Core Height (in)

 18.375 in.
 Core Thickness (in)

 1.000 in.
 Core Width (in)

 27.500 in.
 Fan Included

 No
 Quantity

 Sold individually.

With that said, I saw a picture of a turbo-prop Columbia 400 on the EAA
website today that I really like the looks of the cowl, and very low drag.
I sure would like to be able to do something like that for my rotary ES.
The only thing I can think of is to put the radiator on the firewall and
use
a wedge shaped plenum.  (You did a sketch like this for a Legacy a while
back.)  Now back to reality...

Mark S.

Looks good. Use two back to back in a counter cross flow configuration
on the right side of the engine.  I think a single 10 inch diameter inlet
would work OK if you have a nice set of cowl flaps you can open
to suck the air out the back side through the right side of the
cowl.  Keep the oil cooler as is on the other side.

Pointy noses are over rated as far as drag is concerned :)
Paul Lamar


Paul,

I have a spare cowl which has dual 7" inlets (original cowl has 5.5"
diameter inlets).  I would like to plumb both sides to the water radiator
and then add a small chin scoop for the oil cooler.  I calculate the area
for the two 7" inlets at 77 sq. in.  Assuming adequate exit area, do you
think that 77 sq in would provide enough cfm to cool 350 hp?  I was told
that I should have between 20% and 30% inlet area to radiator face area.  If
so, then 77 sq in. is not even close.

Mark S.

Kind of on the shy side. Also there will be some losses plumbing
the right side over to the left.
Here is a suggestion. Use the right intake and the lower center for the
rad and the left intake for the oil.

Paul Lamar