Random non GMC question

[1976GMC]

Reading some of the past discussions on this forum, I known I'm in the right place to get an answer from the great collective mind and who knows how
many years (lifetimes) of experience...

I recently flew on on a long distance and was watching the telemetry data for the flight. At 37,000 ft altitude, the outside temperature reading was
-74F. At the same time, the inside wall of the bulkhead was not even cool to touch. So the question is: what sort of insulation do they use on these
modern airplanes (it was an Airbus A320)? I'm thinking - it would be great to use that sort of insulation on our GMCs. With my work schedule, it
seems we ether get to use ours in January/February, when it's -10F, or in the middle of the summer, when temps climb up to 90-100F. Ether way, a
better insulation would make it easier on the furnace or AC and more comfortable for everyone.

--
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA

 

[emerystora]

Modern airplanes typically use mat-like insulation packages that consist o=
f a puffy mineral fiber material and welded cover films. The insulation pac=
kages are installed in an overlapping fashion at a suitable distance from a=
n inner surface of the aircraft outer skin so as to from an air gap between=
the aircraft outer skin and the insulation packages. The mats contain pas=
sages that allow circulation of air from the airplanes air conditioning sys=
tem, either heating or cooling which regulates the temperature inside the p=
assenger compartment. The walls are thick enough to accommodate this. =
None of this would be adaptable to the GMC. We must rely on more convent=
ional insulation. The most efficient one for us would be sprayed in place p=
olyurethane foam which is what GM used when our motorhome were built. The p=
roblem is that the GM workers were not very good at applying it. A good spr=
ay job would result in about a 1=E2=80=9D layer between the ribs but if you=
remove the wall and ceiling panels you would find that in some places the =
layer is 1/4=E2=80=9D or even less. The workers were in a hurry and often s=
prayed in a =E2=80=9Ckiss and a miss=E2=80=9D pattern resulting in very poo=
r insulation. Years ago I bought a two tank mixing system to spray addition=
al foam in the ceiling and walls allowing it to expand and them trimming it=
down to the level of the ribs with a hand saw. This, combined with the use=
of Hunter Douglas insulated honeycomb window shades over all flat glass gi=
ves quite good insulation. If I were to do it today I would remove panels a=
nd take the motorhome to a company that sprayed foam into walls of commerci=
al refrigerator/freezers for meat or vegetable storage. It would probably n=
ot cost any more and they have the equipment and experience to do it proper=
ly. The solid polyurethane foam would be much better that the typical bubbl=
e wrap materials that some are using. It also seals any cracks to prevent a=
ir circulation that can occur when using sheet materials. Emery Stora=
77 Kingsley Frederick, CO > On Apr 17, 2019, at 10:19 PM, Vadi=
m Jitkov via Gmclist wrote: > > Reading some=
of the past discussions on this forum, I known I'm in the right place to g=
et an answer from the great collective mind and who knows how > many year=
s (lifetimes) of experience... > > I recently flew on on a long distan=
ce and was watching the telemetry data for the flight. At 37,000 ft altitu=
de, the outside temperature reading was > -74F. At the same time, the in=
side wall of the bulkhead was not even cool to touch. So the question is: w=
hat sort of insulation do they use on these > modern airplanes (it was an=
Airbus A320)? I'm thinking - it would be great to use that sort of insula=
tion on our GMCs. With my work schedule, it > seems we ether get to use o=
urs in January/February, when it's -10F, or in the middle of the summer, wh=
en temps climb up to 90-100F. Ether way, a > better insulation would mak=
e it easier on the furnace or AC and more comfortable for everyone. > =
> -- > Vadim Jitkov > '76 Glenbrook 26' > Pullman, WA > > _____=
__________________________________________ > GMCnet mailing list > Unsu=
bscribe or Change List Options: > http://list.gmcnet.org/mailman/listinfo=
/gmclist_list.gmcnet.org

 

[RF_Burns]

Justin Brady has a page on his site about redoing the foam insulation. His recommendation like Emery's is to just spray additional foam over the
existing stuff.

You can see how poor the factory job was in the photo on his page.

http://www.thegmcrv.com/project/the-insulation-fiasco
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[johnny]

To get a furnace and A/C capable of the BTUs an aircraft system makes availabnle for the same cubage, you'd need anpther GMC empty to carry the
equipment.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"I forgive them all, save those who hurt the dogs. They must answer to me in hell" - ol Andy, paraphrased

 

[kingsley coach]

Great, now we have a plan ! lol

On Thu, Apr 18, 2019 at 12:24 PM Johnny Bridges via Gmclist <

> To get a furnace and A/C capable of the BTUs an aircraft system makes
> availabnle for the same cubage, you'd need anpther GMC empty to carry the
> equipment.
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> "I forgive them all, save those who hurt the dogs. They must answer to me
> in hell" - ol Andy, paraphrased
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

Life is too short to hold a grudge; slash some tires and call it even !

 

[1976GMC]

> To get a furnace and A/C capable of the BTUs an aircraft system makes availabnle for the same cubage, you'd need anpther GMC empty to carry the
> equipment.
>
> --johnny

Haha, I wasn't planning on camping in -73F, so no need to go overkill on the HVAC system Too bad the real airplane stuff is not available as
adhesive tiles.
--
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA