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Message-ID: <4697B0B6.5050702@nc.rr.com>
Date: Fri, 13 Jul 2007 13:04:54 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary Engine <rotaryeng@earthlink.net>,
        Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: Oil cooler air flow
References: <4697A0D6.4000304@earthlink.net>
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Rotary Engine wrote:
>
> You need to read my book Ernest.
> You can get it from Aircraft Spruce
> http://www.rotaryeng.net/how-to-cool12.html
> http://www.aircraftspruce.com/catalog/bvpages/coolYourWankel.php
> -- 
> Paul Lamar ...No rotor no motor.
>

Yeah....
I'll probably skip that one.
>
> Here is a better way of dealing with the boundary layer Al.
> This is from Hoerner Fluid Dynamic Drag.
> -- 
> Paul Lamar ...No rotor no motor.

The thing is, Al's trying to improve cooling, not reduce drag.  Your 
proposal may be a good solution if he was working from a clean sheet, 
but I know I wouldn't want to do the butcher job to a completed wing 
that this retrofit would require.  Even from a clean sheet, the 
straight-line wedge duct as depicted would leave a lot of cooling on the 
table.  The back side of the core would get an overabundance of airflow, 
while the front side gets little to none.  The air that does flow will 
meet the core fins at an acute angle that will cause flow separation on 
the backside of the fins and block flow through the radiator.  The goal 
is to get the air to flow into the entire face of the  core.
>
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