X-Mozilla-Keys:                                                                                 
Fredmoreno@aol.com wrote:

The improved triple pass radiator they show suggests that the velocity in the
core is not high enough for good cooling, and so contributes substantially to
overall thermal resistance.  This should not be a problem in aircraft as the
engine is running at high rpm all the time.  But you need to be sure that you
have adequate flow rate of coolant

In the table I generated for cooling a 180 hp 13B, I failed to note that the
assumed flow rate of coolant was 40 gpm (a figure pulled form a portion of my
anatomy).  This proves inadequate for the heat rates analyzed, and should be
60 and preferably 80 gpm for best thermal performance.  I will reexamine the
180 HP case, and also try to show sensitivity to flow rates in a separate
graph.

Fred

Opps! We are looking at flow rates of 30 gph or less Fred.
Jeff & Paul Yaw are working on water pump improvements but that may
be down the road so to speak.

Paul Lamar
 
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