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Date: Thu, 19 May 2011 08:53:54 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Overheating single rotor
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On 05/18/2011 10:33 PM, Richard Sohn wrote:
> * Some time ago I disassembled my test engine and discovered what 
> looked like local over heating. It appears to have been the result of 
> my own ignorance.*

Richard, if we knew all the stuff we don't know before-hand, it wouldn't 
be any fun, would it?  8*)

> *It appeared to me that the reason for the local overheating must be 
> somewhere in the coolant flow. I think, someone on the other e-mail 
> group pointed to that possibility. *
> *What it boils down to is the fact that not all the cooling pockets in 
> the rotor housing are open to coolant flow. In particular, the second 
> opening on the inlet side is totally blocked off by the side housings. 
> I left it open, and worsening the situation, there is a comparatively 
> large hole in the rotor housing web. As a result, most of the coolant 
> did go through this opening, and not through the area around the 
> plugs. If I had looked close at the flow pattern from MAZDA this 
> problem could have been avoided. *
> **
> *Fortunately, there is no permanent damage to the engine, and the 
> engine in the airplane has not run yet. I fixed the problem by closing 
> off the opening. The engine is now going back to the test stand for 
> another 10+ hrs of beating. *
> **

And the aforementioned unknown unknown is now a known known.

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    On 05/18/2011 10:33 PM, Richard Sohn wrote:
    <blockquote cite="mid:list-4988168@logan.com" type="cite">
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          <div><font face="Arial" size="2"><strong>&nbsp;Some time ago I
                disassembled my test engine and discovered what looked
                like local over heating. It appears to have been the
                result of my own ignorance.</strong></font></div>
        </font></div>
    </blockquote>
    <br>
    Richard, if we knew all the stuff we don't know before-hand, it
    wouldn't be any fun, would it?&nbsp; 8*)<br>
    <br>
    <blockquote cite="mid:list-4988168@logan.com" type="cite">
      <div><font face="Arial" size="2">
          <div><font face="Arial" size="2"><strong> It appeared to me
                that the reason for the local overheating must be
                somewhere in the coolant flow. I think, someone on the
                other e-mail group&nbsp;pointed to that possibility. </strong></font></div>
          <div><strong><font face="Arial" size="2">What it boils down to
                is the fact that not all the cooling pockets in the
                rotor housing are open to coolant flow. In particular,
                the second opening on the inlet side is totally blocked
                off by the side housings. I left it open, and worsening
                the situation, there is a comparatively large hole in
                the rotor housing web. As a result, most of the coolant
                did go through this opening, and not through the area
                around the plugs. If I had looked close at the flow
                pattern from MAZDA this problem could have been avoided.
              </font></strong></div>
          <div><strong></strong>&nbsp;</div>
          <div><strong><font face="Arial" size="2">Fortunately, there is
                no permanent damage to the engine, and the engine in the
                airplane has not run yet. I fixed the problem by closing
                off the opening. The engine is now going back to the
                test stand for another 10+ hrs of beating. </font></strong></div>
          <div><strong></strong> <br>
          </div>
        </font></div>
    </blockquote>
    <br>
    And the aforementioned unknown unknown is now a known known.<br>
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