Jerry Hey wrote:

  This cooling scheme fits the

Tailwind perfectly.  On the ground with the exhaust vents closed, the
13B installation will be invisible. ---Jerry

Mike Wills wrote:

  And on the ground it may not cool at all. May need some fans for taxi. I
think I've been told that the NACA works moderately well for the EZ types
on the ground because the proximity of the prop to the exit provides a good
low pressure to pull the air through the system. Can you comment on this
aspect of Jerry's proposed cooling scheme Bill? You wont have that going
for you. And your inlets are far enough back from the prop that you wont
see a lot of benefit from prop blast on the inlet side either.

  I sure understand the need to not compromise on the aesthetics of the
installation. I'm working on the same dilemma with my oil cooler
installation now.

  It will be interesting to see how this works for you. I wish you luck.

Mike Wills

I agree. I think fans are a good idea for you Jerry.

Paul Lamar

Bill Freeman wrote:

At 06
Jerry,
If you can find a nice lightweight fan assy, it would be a good idea.  The NACA
may not do much at taxi speeds.  Take a scale to the local salvage yard, esp
if you have one of the new "fancy" ones that pull all the stuff off and
stacks it on
shelves.  Weigh at least 6 or 8 different ones.  Find a moderate sized LIGHT
unit.  Remember, you will NOT be pulling significant HP when on the ground,
and WILL
be losing payload and adding drag to the cooling system with a fan.  A
small, partial coverage fan may be plenty for ground cooling.  If it was me,
I think I'd at least try a few ground runs before I panic and add a system
that I just might not need.  If you can taxi around for 10 minutes at low
throttle settings without overheating, you should at least tart the test
program without a fan.  You can always add it later - and keep that in mind
so as
to not do anything that might preclude adding a fan  later.

                 Systems that you don't buy are the cheapest.
                 Systems you don't install are the lightest and they NEVER fail.

Bill Freeman

 
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