Joseph M Berki wrote:

Paul,
        The radiator which I need to have built is 24" X 12" and will

sit next to

a stock Mazda oil cooler.  They will be mounted in a tray under the main
spar at an angle downward.  A P51 scoop feeds this whit the inlet under
the main gear.  The aft end of the rad/cooler line up just behind the fron
of the motor looking at it from the side.

Joe

OK I will draw it into the 3D.
Perry mentioned your engine looked a bit too far aft. How far is it

>from the e-shaft pulley to the firewall.

Paul Lamar

Joseph Berki wrote:

Paul,
         It is 27" from the firewall to the bellhousing location where the
ears are bolted.  Used this location because the widest point of the mount
is further forward than plate design making it easier to cowl.  Have you
tested the wedge duct / diffuser?  I thought the Caravan episode was a K&W
duct?  Thanks
Joe

No the Caravan test was a simple wedged shaped duct. The K&W duct has a few
problems for our use. Number one is; it is only valid for rads mounted 
perpendicular to the axis of the duct. This means any tilting
of the rad becomes highly configuration sensitive and extensive 
development would be required to insure uniform air flow through
the core. You could spend months with a test rig optimizing the
exact shape of the duct. Velocity taps should be used all
over the back side of the rad to insure uniform air flow.


The second major problem is the K&W is too long. In your case 
it would be half the length of the fuse :)

BTW Those are real big problems with rads mounted on either 
side of the PSRU in a tractor configuration. Thick or thin they 
both have the same problems. Nobody is doing their homework on this. 

Paul Lamar
 
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