| Random non GMC question [message #342627] |
Wed, 17 April 2019 23:19  |
NextGenGMC
Messages: 146
Registered: December 2017
Location: Washington State
Karma: -1
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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
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| Re: [GMCnet] Random non GMC question [message #342628 is a reply to message #342627] |
Thu, 18 April 2019 01:39  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Modern airplanes typically use mat-like insulation packages that consist of a puffy mineral fiber material and welded cover films. The insulation packages are installed in an overlapping fashion at a suitable distance from an 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 passages that allow circulation of air from the airplanes air conditioning system, either heating or cooling which regulates the temperature inside the passenger compartment. The walls are thick enough to accommodate this.
None of this would be adaptable to the GMC. We must rely on more conventional insulation. The most efficient one for us would be sprayed in place polyurethane foam which is what GM used when our motorhome were built. The problem is that the GM workers were not very good at applying it. A good spray job would result in about a 1” 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” or even less. The workers were in a hurry and often sprayed in a “kiss and a miss” pattern resulting in very poor insulation. Years ago I bought a two tank mixing system to spray additional 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 gives quite good insulation. If I were to do it today I would remove panels and take the motorhome to a company that sprayed foam into walls of commercial refrigerator/freezers for meat or vegetable storage. It would probably not cost any more and they have the equipment and experience to do it properly. The solid polyurethane foam would be much better that the typical bubble wrap materials that some are using. It also seals any cracks to prevent air circulation that can occur when using sheet materials.
Emery Stora
77 Kingsley
Frederick, CO
> On Apr 17, 2019, at 10:19 PM, Vadim Jitkov via Gmclist wrote:
>
> 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
>
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| Re: Random non GMC question [message #342634 is a reply to message #342627] |
Thu, 18 April 2019 09:56 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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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
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| Re: [GMCnet] Random non GMC question [message #342637 is a reply to message #342634] |
Thu, 18 April 2019 11:12 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
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Great, now we have a plan ! lol
On Thu, Apr 18, 2019 at 12:24 PM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> 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
>
>
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--
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 !
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| Re: Random non GMC question [message #342657 is a reply to message #342634] |
Thu, 18 April 2019 22:53 |
NextGenGMC
Messages: 146
Registered: December 2017
Location: Washington State
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Johnny Bridges wrote on Thu, 18 April 2019 07:56To 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
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