From: ReganRanch@aol.com
Message-ID: <c9cf6c75.36447140@aol.com>
Date: Sat, 7 Nov 1998 11:11:44 EST
To: lancair.list@olsusa.com
Subject: Hot time in a IV-P
Mime-Version: 1.0

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In a message dated 98-11-06 23:33:19 EST, you write:

<< Other opinions/observations?? Info/sources of A/C systems for an IVP??
  >>

Living in the CA Central Valley I have lots of experience with hot weather. My
standard operating procedure on a hot day is to start and taxi with the door
open, run-up, takeoff and climb to 8K with the door seal off (this allows lots
of airflow into the cabin), seal the cabin and pressurize, heat on above
FL250. Using this procedure has the same relative discomfort as driving a car
without AC and the windows open.

I really don't see the logic in adding AC. By the time the AC is effective,
you are ready for takeoff and wont need it in another 10 minutes. Then there
is weight, drag, reliability and maintenance. The AC condenser pods seem to
reduce IAS by about 10Kts, this has a big negative impact on engine cooling.

If you had to have supplemental cooling then I would make a large, parallel,
Peltier device (solid state heat pump used in ice chests and RV refrigerators)
and build it into the upper aft pressure bulkhead. The existing cabin fan
would circulate cool air and a fan in the baggage compartment would take away
heat. A second alternator would provide the 1.5KW needed for the system (and
emergency power in a pinch). The entire installation would weigh less than 10
lbs and add no drag.

Food for thought.

Regards
Brent