auxiliary heat

[Jim Burns]

Does anyone in the group use a 12v auxiliary heater or heated blanket for
added cabin or passenger heat? I've seen that they come in 150watt/12.5 amp
and 300watt/ 30amp versions. We'd have to figure out the current load on
our alternators but I'm wondering if we should even consider such an option
for the rear seat passengers in our Aztec. I've seen this quesion asked
before but it's been several years.

Jim


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[Jim Burns]

What about portable heated seat cushions?? 12v/60watt/5amp 100-120 degrees
surface temp

"Jim Burns" > wrote in message
...
> Does anyone in the group use a 12v auxiliary heater or heated blanket for
> added cabin or passenger heat? I've seen that they come in 150watt/12.5
amp
> and 300watt/ 30amp versions. We'd have to figure out the current load on
> our alternators but I'm wondering if we should even consider such an
option
> for the rear seat passengers in our Aztec. I've seen this quesion asked
> before but it's been several years.
>
> Jim
>
>
> ---
> Outgoing mail is certified Virus Free.
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[[email protected]]

I'm assuming you mean for seat heat, and not space heat? It's awfully
difficult to get much heat out of 14V. Even automotive folks (with a fairly sealed
cabin) do very minimal heating on very localized areas (read: arse). It might be
doable, but only for localized/concentrated situations (seat heat, blankets, etc).

Imagine getting cabin heat from a hair dryer... 1250-1500W... around 100A for
14v.

-Cory

Jim Burns > wrote:
: Does anyone in the group use a 12v auxiliary heater or heated blanket for
: added cabin or passenger heat? I've seen that they come in 150watt/12.5 amp
: and 300watt/ 30amp versions. We'd have to figure out the current load on
: our alternators but I'm wondering if we should even consider such an option
: for the rear seat passengers in our Aztec. I've seen this quesion asked
: before but it's been several years.

: Jim


: ---
: Outgoing mail is certified Virus Free.
: Checked by AVG anti-virus system (http://www.grisoft.com).
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--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

[Jim Burns]

Correct.
It would be about like huddling around a 150 watt lightbulb. I'm thinking
heated seats or blankets.
Jim
> wrote in message
...
> I'm assuming you mean for seat heat, and not space heat? It's awfully
> difficult to get much heat out of 14V. Even automotive folks (with a
fairly sealed
> cabin) do very minimal heating on very localized areas (read: arse). It
might be
> doable, but only for localized/concentrated situations (seat heat,
blankets, etc).
>
> Imagine getting cabin heat from a hair dryer... 1250-1500W... around 100A
for
> 14v.
>
> -Cory
>
> Jim Burns > wrote:
> : Does anyone in the group use a 12v auxiliary heater or heated blanket
for
> : added cabin or passenger heat? I've seen that they come in 150watt/12.5
amp
> : and 300watt/ 30amp versions. We'd have to figure out the current load
on
> : our alternators but I'm wondering if we should even consider such an
option
> : for the rear seat passengers in our Aztec. I've seen this quesion asked
> : before but it's been several years.
>
> : Jim
>
>
> : ---
> : Outgoing mail is certified Virus Free.
> : Checked by AVG anti-virus system (http://www.grisoft.com).
> : Version: 6.0.775 / Virus Database: 522 - Release Date: 10/8/2004
>
>
>
> --
>
> ************************************************** ***********************
> * Cory Papenfuss *
> * Electrical Engineering candidate Ph.D. graduate student *
> * Virginia Polytechnic Institute and State University *
> ************************************************** ***********************
>


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[David Johnson]

Back in WW2 they used to have heated flight suits for the crews
of military aircraft. I imagine that they were particularly
useful in the high flying bombers with huge open gun ports on
the sides. I had a pair of the slippers at one time, and found
that they really did work. I used a variable DC supply to power
them. Originally they ran on aircraft power (28V) through a
rheostat. I never tried them in an airplane, but something similar
may be what you need. I have seen some battery powered socks in
outdoor supply catalogs.

Another approach might be chemical heat pads. I happened to look
at some in the hardware store the other day. You activate them
by simply opening the package and exposing the pad to the air.
Finding out if they will do the job will be cheap - they only
cost a dollar or so.

David Johnson

[zatatime]

On 18 Oct 2004 20:05:15 -0700, (David Johnson) wrote:

>Another approach might be chemical heat pads.


These things work great, just make sure they're on the outside of your
socks.

I used 'em a bunch flying Cubs in the winter. For some reason if your
feet are warm your whole body feels a bit warmer.

z

[Doug]

There are motorcycle vests that really work. They use the motorcycle
battery so they don't draw "much", though I really don't know how
much. It's like having the sun beating down on your back. Work best
worn under a jacket. Check out moto cycle shop or online motorcycle
supply place.

"Jim Burns" > wrote in message >...
> Does anyone in the group use a 12v auxiliary heater or heated blanket for
> added cabin or passenger heat? I've seen that they come in 150watt/12.5 amp
> and 300watt/ 30amp versions. We'd have to figure out the current load on
> our alternators but I'm wondering if we should even consider such an option
> for the rear seat passengers in our Aztec. I've seen this quesion asked
> before but it's been several years.
>
> Jim
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.775 / Virus Database: 522 - Release Date: 10/8/2004

[Kyler Laird]

I used a heated seat cushion, chemical packs (in lots of places)
and a little 12VDC car (air) heater when I was going between
California and Indiana a couple winters ago without heat. I
still froze.

I recommend lots of insulative clothing and heating devices under
that. (Try the heaters designed for motorcycle riders.)

--kyler

[Joe Dubner]

On 18-Oct-04 20:40 zatatime wrote:
> On 18 Oct 2004 20:05:15 -0700, (David Johnson) wrote:

[snip]

> For some reason if your
> feet are warm your whole body feels a bit warmer.

That's the theory I used when I wired in some Gerbing's electrically
heated socks for my Long-EZ. They're economical (both cost-wise at $60
and energy-drain wise at 2A). I picked up a set in a Boise (Idaho)
motorcycle shop but they're available on the web too. See
http://www.gerbing.com/pages/clothing/socks.html

Along with thermal underwear, they fill 90% of my heat requirements for
wintertime flying at medium altitudes (FL010 to FL180) but my right hand
still gets too cold for comfort. I think the stick's control grip is
"sucking the heat" out of my hand so I'm looking at a Rube Goldbergesque
scheme to put a small power resistor into the stick.

--

Joe
(Remove "NOSPAM" to reply via Email)
Long-EZ 821RP
Clarkston, WA

[Jay Honeck]

> That's the theory I used when I wired in some Gerbing's electrically
> heated socks for my Long-EZ.

Hmm. This is something I'd not considered before, never having seriously
considered a homebuilt plane.

Do Long-EZs not have *any* heat? Does having the engine behind you
preclude using hot air off the exhaust for cabin heat?
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"

[PaulaJay1]

In article >, zatatime
> writes:

>These things work great, just make sure they're on the outside of your
>socks.
>
>I used 'em a bunch flying Cubs in the winter. For some reason if your
>feet are warm your whole body feels a bit warmer.
>

Boy Scouts say, "if your feet are cold, put on a hat."

Much of your heat loss is via the head, so don't forget the hat in winter.

Chuck

[Joe Dubner]

> Do Long-EZs not have *any* heat? Does having the engine behind you
> preclude using hot air off the exhaust for cabin heat?

Like any homebuilt, it has whatever heating system the builder opts for
<g>.

In the Long (and other EZs), this ranges from nothing at all, to a
exhaust heat muff and a long duct forward, to a forward mounted oil
cooler used as a cabin heat exchanger. One local has a 28V/350W quartz
heater.

I had a exhaust heat muff system but found it so ineffective that I
removed it and used the duct for a wiring conduit. On a sunny day, the
solar heat gain is enough to keep me comfortable in sweatshirt and jeans
except for me feet (hence the heated socks) and my stick hand.

When I flew a Piper Apache my feet were always cold too in spite of that
expensive (to operate and to repair) gas-burning heater. Wish I had
known of the electric socks then. As a bonus, I'd probably be a lot
smarter today, not having inhaled so much carbon monoxide :-)

--
Joe
Long-EZ 821RP
Clarkston, WA



On 19-Oct-04 06:36 Jay Honeck wrote:

>> That's the theory I used when I wired in some Gerbing's electrically
>> heated socks for my Long-EZ.
>
> Hmm. This is something I'd not considered before, never having seriously
> considered a homebuilt plane.
>
> Do Long-EZs not have *any* heat? Does having the engine behind you
> preclude using hot air off the exhaust for cabin heat?

[Marc J. Zeitlin]

Jay Honeck asked:

> Do Long-EZs not have *any* heat?

While there is a heating system design for the LE, many folks don't
install it, and when they do, it works with varying degrees of success.
Some folks are toasty, and other freeze, even with the heat.

> .....Does having the engine behind you
> preclude using hot air off the exhaust for cabin heat?

Not at all. My COZY MKIV (basically a 4-seat L.E.) uses an exhaust muff
on the right side pipes to run heated air through a duct up to my feet
area. The first winter I flew, this system would maintain a 20 degree F
temperature difference between outside and inside. After mucho
weathersealing, the second winter I could maintain a 30 degree F
difference. This coming winter, after more sealing, I'm hoping to get a
35-40 degree delta between outside and inside.

If the sun's out, the large canopy adds another 10-20 degrees to
interior temps, too.

With long underwear and gloves, I'm good down to about 20 F. Below
that, I don't like going out to the airport and firing up anyway - I'm
tied down outside, and it's a pain to preheat.

You've got to remember - the L.E. was designed by a guy that lives in
Mojave, CA, and the COZY by a guy that lives in Phoenix, AZ. Neither of
them care a lot about heat :-).

--
Marc J. Zeitlin
http://marc.zeitlin.home.comcast.net/
http://www.cozybuilders.org/
Copyright (c) 2004

[G.R. Patterson III]

Joe Dubner wrote:
>
> I think the stick's control grip is
> "sucking the heat" out of my hand so I'm looking at a Rube Goldbergesque
> scheme to put a small power resistor into the stick.

I bought a pair of deerskin gloves. They work very well at keeping my hands warm
without being bulky.

George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.

[One's Too Many]

(Doug) wrote in message >...
> There are motorcycle vests that really work. They use the motorcycle
> battery so they don't draw "much", though I really don't know how
> much. It's like having the sun beating down on your back. Work best
> worn under a jacket. Check out moto cycle shop or online motorcycle
> supply place.
>

Also have a look at electric socks. I find it's very true that when
your feet are warm, the rest of you feels warmer too. A down-filled
sleeping bag (unzipped wide-open) makes a nice warm blanket for your
back seat pax to cover up with too, and doesn't have any electric
requirements. That's what we used last winter and it was very
effective. Not very "elegant" but it got the job done.

[Kyler Laird]

Joe Dubner > writes:

>I think the stick's control grip is
>"sucking the heat" out of my hand so I'm looking at a Rube Goldbergesque
>scheme to put a small power resistor into the stick.

or...
http://www.hotgrips.com/styles.html

--kyler