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Date: Wed, 25 May 2005 11:36:32 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Galvanic action (was: radiators as jugs 4)
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Bill Dube wrote:

>
>         The main problem I see is that the radiators are not 
> electrically isolated from the aircraft frame and engine block. There 
> is no vibration isolation either. This can cause serious problems with 
> metal fatigue and with corrosion driven by galvanic action.
>

There was a piece of weatherstripping between the bottom bevelled piece 
and the radiator.  Sorry, didn't mean to leave that out.  But there 
would probably be plenty of electron flow through the threaded rods and 
plates (even though the plates are all painted).  A good powdercoating 
on the plates may eliminate that path.  Some mylar tape 'washers' would 
probably be a better idea.

The biggest problem I saw was that this wouldn't provided enough 
cooling.  He had 3 rad-jugs dedicated to coolant and two dedicated to 
oil.  The volume would work for jugs because they're running at 350 to 
400 degrees.  The water is only at 180, so it needs quite a bit more.  
On a 20B, this arrangement might work for the oil only, but as Rusty 
taught us, the rotary isn't nice to just anything standing in for oil 
coolers.

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