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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Oil Cooling Issues
Date: Fri, 16 Jun 2006 21:28:51 -0400
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

>
> It will depend on, if your cooler is "serpentine style" (one tube  
> meandering
> back and forth through the cooling fins) or a "tank  
> style" (collector tanks
> on both sides and multiple cross tubes).
> Serpentine doesn't allow air-cushions (Think shower-hose) No matter  
> if the
> water goes up or down the hose, any air is purged out with the flow.
> With end-tanks, the flow-speed comes way down in the cooler and may  
> allow
> air to ocuppy the upper few cross tubes, reducing the effective  
> cooling area
> as the oil goes through the lower tubes.
> If you have the "OUT" on top it will push the air out into the  
> engine, no
> matter what...
>
> Thomas

Thomas, his oil cooler has the one side tank split in two. Oil enters  
in the one of the half side tanks and is forced through the first  
half of the flat tubes to the other end. Than it is returned back to  
the other half end tank.
The thermostat opens the partition between the both halves at the  
first side tank, and the oil passes without taking the long path  
through the flat tubes. I think if there was air trapped, soon or  
later the oil will purge it out. Most likely the thermostat allows  
direct bypass of the core?
Buly