I don't see anything wrong with running a duct into the cabin. My plane
(74 warrior) has the battery under the back seat and it must also be
preheated. I run warm air into the cabin from my Red Dragon and prop up
the bench seat so the air gets to it. By the time I've shut down the
heater, put it away, opened the door and got in, any CO buildup is
gone.

Electric heater would work great except for the fact that I don't have
a hangar or electricity available.


Blanche wrote:
dave wrote:
I'm not planning on using it to preheat the cabin. I'm wondering how
this is any different than a red dragon or the large pre-heaters that
the FBO's use.

Dave

Stan Prevost wrote:
If this is blowing the warm combustion gases into the cabin, plenty of
drawback. The combustion products are primarily carbon dioxide and water
vapor. Lots of water vapor. The moisture can fog all the windows, or
create frost on the inside of the windows if it is below freezing. OK on
the engine, bad in the cabin.


"dave" wrote in message
. ..
Another thread made me think about using the portable propane heater I use
in my garage to preheat my airplane. It's the standard metal tube type
with the fan from Home Depot or Lowes. I've seen people simply attach a
flex duct to the end of this type heater and blow the hot air into the
cabin - poor man's red dragon. Any drawbacks?

Didn't snip -- all the info is needed...

"blow the hot hair into the cabin" read just like that - you were
attempting to heat the cabin and not the engine. IIUC, you are thinking
of using the duct to blow air into the air intakes of the engine?
That's all a Red Dragon is, without the paint job and logo.