jimpuglise(at)comcast.net
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 Posted: Sun Jan 15, 2012 6:44 am Post subject: Better Cabin Heater |
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Carl-
Long shot but may be worth looking at. If your cabin is well sealed, the positive pressure in the cabin may be preventing adequate flow. I put a vent in my "D" panel that John Lawton recommended. You may want to try something similar before rebuilding your heater.
Jim Puglise
Europa XS, Jab 3300
From: "Carl Meek" <carlmeek(at)gmail.com>
To: jabiru-list(at)matronics.com
Sent: Sunday, January 15, 2012 3:54:56 AM
Subject: Better Cabin Heater
Hi,
Yesterday was freezing inside my Europa XS with Jabiru 3300. My wife has now refused to fly until I rectify the situation - she wants a 20 degree cabin!
The current cabin heater layout is:
* Opening on the cowl to provide a RAM air into the SCAT hose
* Goes through a shallow metal V that's jubilleed to a horizontal running exhaust pipe on the left
* Goes into a on/off box with pull cable
* Goes through the firewall into a fibreglass box
* Splits into 2
* Goes to 2 ball valves above pilot and passenger footwell
I didn't measure the SCAT hose, it's something in the region of 2 or 2.5"
With the ball valves open, the airflow is pretty decent, but virtually no detectable heat
Closing one valve completely, and the other to 20%, i can JUST detect mild warmth.
OAT yesterday probably around 2 degrees at best, air coming out of vent might have been 10-15 at a push with virtually no flow
It's clearly the design of the heat exchange/exhaust muff that is rubbish, it has so little contact with the exhaust pipe.
It looks like two 5 inch long stainless pipes welded at a 15 degree angle. The angle has then been cut away to fit over the exhaust.
So.... what to do? Can anyone recommend where I can get a ready made muff that will perform better, or do i need to have one made?
Thanks in Advance,
Regards,
-Carl.
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