Jerry Hey wrote:

Does anyone see a problem with supplying air to the cool tube as shown
in the drawing?   Also,  could slowing the air inside the tube by
slightly restricting the outlet be beneficial?   The purpose would be
to make sure  cool air contacted 100 per cent of the inner surface of
the cool  tube.  If it just swirls in from the inlet, might there be
hot spots?     Jerry

Jerry Hey
j-winddesigns@thegrid.net

You won't get any airflow unless you hook the 1-1/2 inch tube to a
source
of dynamic pressure. Restricting the out let will hurt rather than
help.

If you really want to cool the tube better you need internal
fins. No easy way to do that.

Paul Lamar

Let me try again:
  The purpose of the 1.5 feed tube is to clear the S beam so that air
can be taken from the front of the cowl (I thought that was obvious),
Air will  be blasting through the cool tube.  But swirling air does not
necessarily touch all surfaces,   so I asked about slowing it down a
bit.        Jerry

That won't do any good. The faster the better.

Paul Lamar
 
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