REFLECTOR: Cabin Heat - Really Alternative

[Andrew Ellzey]

I haven't seen anyone talk about sealing the keel elevator push rod hole, 
the attached photo shown my solution.


Andrew Ellzey
479-631-2851 (Office)
479-531-5139 (iPhone)

-----Original Message----- 
From: William Walker
Sent: Thursday, January 19, 2012 8:29 PM
To: reflector at tvbf.org
Subject: REFLECTOR: Cabin Heat - Really Alternative

I had my upholstery shop install inexpensive, aftermarket seat heaters in my 
front seats during my interior installation. They are Hi/Lo switched, have 
their own circuit breaker, and work wonderfully. As others have said, 
sealing the elevator push rod at the top of the keel, as best you can, is 
very important. My shop used rubberized 1/4" sheeting and made two 12" by 5" 
flaps that run along the top front of the keel. They simply velcroed them to 
my carpet pieces running up the sides of the keel where it meets my elevator 
push rod cutout. The flaps then go vertical, kind of forming around the push 
rod, but are not sealed at the top. They do, however, try to naturally 
straighten out and form a satisfactory quasi-seal around the push rod. It 
pushes the incoming air up, behind the panel, where it encounters warm 
avionics and feels much better than not having them there at all.

I also fabricated a block-off panel to seal out the air from the nose wheel 
area which mates to the leading edge of the canard with rubber gasket 
sheeting. Two screws through the forward Triax canard tabs hold it in 
position.

The seat heaters would not be too much of a pain to retrofit, and the 
cost-to-benefit ratio is outstanding. I have flown comfortably down to 
18F/-8C with my cabin heat producing very little or no output (IO-550 cool 
running syndrome).

Bill Walker
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