REFLECTOR: Cabin Heating
Chuck Jensen
reflector@tvbf.org
Tue, 27 Jan 2004 13:16:33 -0500
Ooops....220F. At 220C, I could install a french frier.
Chuck
220C is 428F...
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
Behalf Of Chuck Jensen
Sent: Tuesday, January 27, 2004 9:19 AM
To: 'reflector@tvbf.org'
Subject: RE: REFLECTOR: Cabin Heating
Since every configuration is different, yours may vary but I tried some
of your proposed fixes with less than stellar results. My cabin air is
fed from a flapper that opens and taps air flow downstream plenum of the
front oil cooler and ducts it to the cabin. It was obvious, due to the
massive airflow thru the oil cooler, the outlet discharge air was heated
just a few degrees. Figuring that by slowing the air flow, the
increased residence time would allow sufficient heating of the air, I
cut some squares of a cloth bag filter and put 4 layers over the cooler
inlet and plugged the plenum outlet. The only air allowed to pass was
what I feed to the cabin. My plan was to rely on the rear oil cooler to
maintain engine oil temps.
On the test flight at OAT 5C, the cabin heat was nice and toasty; a big
improvements (and a high "smug" factor). Then the oil temps started to
climb, and climb. Finally topping out at 220C (181C is normal) and
elevated CHTs at reduced cruise. End of experiment. Removed the outlet
plug and 2 of the 4 cloth layers on the inlet and went back to freezing
at 0C OAT. It was unexpected (in my mind) that the front oil cooler
carried that large a fraction of the cooling load. I expected to be
able to block off the front cooler and still maintain adequate oil
temperatures. Not. There just doesn't seem to be a happy medium.
Bottom line; I'm going to try a second oil cooler, in series with the
front cooler, that's dedicated solely to cabin heat.
Chuck
Jim S. wrote:
I have the same problem with my 173 FG. I have outlets to the cabin in
the outlet plenum of the forward oil cooler, but not much air goes there
if it can get out the bottom scoop. I plan on making a "flapper valve"
that in one position covers the outlets to the cabin, and in the other
position covers the overboard vent. That will force all the air coming
through the forward cooler into the cabin. Of course that's continually
heating outside air, so if it still doesn't work, I'll fix it so when I
open the vents to the cabin and close the overboard vent, it will also
close off the inlet and turn on a blower that recirculates cabin air
through the forward cooler. I'm not worried about not being able to cool
the oil since this only happens in the dead of winter when the aft
cooler should be able to do the job by itself. Fix it next summer, try
it next winter .... Jim S.
Chuck Jensen wrote:
> Jack,
>
> I get the same speed in the XL RG...if I have about an 80kt
> tailwind!!! I too am going thru the "I tired of freezing to death and
> I'm not going to take it any more." I'm going to try tapping into the
> oil line to the
front
> cooler and route it to a cooler in a plenum in the nose so the air
> flow
can
> slow down and absorb the heat or I'll route it to a oil cooler in the
cabin
> and use a fan to blow air across it.
>
> No doubt about it, the heated seats and nice blanket doesn't cut it at
-8C.
> It feels like a meat locker. When I blocked off enough air flow
> through
the
> front oil cooler, it heated up the air nice, but the engine oil temp
> went
up
> 30F. I don't know what I'm doing, but I'm doing it!!!
>
> Want a cheap speed increase...gap seals were the answer for me. I
> gained
an
> easy 5 kts and maybe as much as 8-9kts with a $5 gap seal kit, though
> it doesn't help aileron responsiveness any!
>
> Chuck
>
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Jack Sheehan
> Sent: Monday, January 26, 2004 2:03 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR: Vortilons
>
> Wow ! So much discussion VG's Vortillons , Trailing edge fences. I
> must be nuts. I have about 150 Hours on my XL-RG I did the test flying
> without anything. It flew great. I painted the airplane and it flew
> better. ( guess I just got better). I have looked at all the stuff and
> am reluctant to make any changes because the wing just looks good
> clean. The airplane gets a little sloppy below 100 knots with the gear
> down. You have to use the rudders to lead the turn and the aileron
> inputs are very deliberate. The problem I have is I am so used to it
> everything feels OK. I plan to install the vortillons and see if that
> makes a big change and then put on some trailing edge fences to see if
> that does anything. I would remove anything that effects the top end.
> I would rather go fast. The only other modification I would be looking
> to do would be to get some more heat in the airplane. On a trip back
> from Kentucky last week I was really cold OAT -8C @ FL 015 but the
> ground speed was 260 KTS 285 in the decent.
> Jack
> N55XL
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--
Jim Sower ... Destiny's Plaything
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T
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