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There have been a few comments about
the efficiency of the NACA duct on the tail negating the need for a cabin fan on
the ES or IV. Inflight this is true. Those of us who advocate them
will all attest to their effectiveness on the ground. I don't use my fan
at all in flight, but unless it's a pretty cool day, it's on every moment I'm on
the ground. In the summer, I consider it essential, as the cabin
can become a sweltering greenhouse in the sun. I can still recall the
image of Orin after doing my first flight on August 13th. He had the fan
on and 4 overhead vents all pointed at his head and still emerged drenched
in sweat.
The bottom line is that the NACA duct
does not become effective until you're at flying speed. Between
pre-start, after start, taxi, runup, and after landing taxi up until you
shut down, there is plenty of time every flight that you'll be glad you
installed a fan.
My .02 worth.
Skip Slater
N540ES
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