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Dual Bag... [message #281266] Thu, 02 July 2015 09:42 Go to next message
Chr$ is currently offline  Chr$   United States
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Registered: January 2004
Location: Scottsdale, AZ
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I thought this setup didn't work well?
Gateway is selling this.

http://www.gmcmotorhomeparts.com/Air%20Bags%20=%20Double%20Bag%20PHOTO.jpg

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

[Updated on: Thu, 02 July 2015 09:42]

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Re: Dual Bag... [message #281275 is a reply to message #281266] Thu, 02 July 2015 10:39 Go to previous messageGo to next message
Joe Weir is currently offline  Joe Weir   United States
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Why wouldn't it? It just would not have the redundancy and limp home characteristics of the rigid center mount 4 bag systems. I would think it would have more redundancy than a standard 2 bag system, though.

76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator, brakes, Sully airbags, fuel lines, seats, adult beverage center... those Coachmen guys were really thinking about us second hand owners by including that beverage center... Columbia, SC.

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Re: Dual Bag... [message #281276 is a reply to message #281275] Thu, 02 July 2015 10:44 Go to previous messageGo to next message
tphipps is currently offline  tphipps   United States
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The first version, built like this, had failures of the center support due to flexing. I have no knowledge of the exact system being sold by Gateway.
Disclaimer: I have a four bag system installed, designed by Leigh Harrison. It works well.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

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Re: Dual Bag... [message #281300 is a reply to message #281276] Thu, 02 July 2015 12:50 Go to previous messageGo to next message
Harry is currently offline  Harry   Canada
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It may work if it was bolted down.

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Re: Dual Bag... [message #281301 is a reply to message #281300] Thu, 02 July 2015 12:53 Go to previous messageGo to next message
Chr$ is currently offline  Chr$   United States
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Location: Scottsdale, AZ
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Yeah, I noticed that it wasn't bolted down too! Laughing

I just thought there was a safety issue as well with the flappy paddle bag system.

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

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Re: Dual Bag... [message #281303 is a reply to message #281266] Thu, 02 July 2015 13:11 Go to previous messageGo to next message
habbyguy is currently offline  habbyguy   United States
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Silly question, but why not just eliminate the whole center arm / pivot? You'd end up with something pretty similar to a single-bagger system... you'd still have the redundancy of being able to limp along with one bag blown (though with twice the opportunity for a blown bag), and you wouldn't have to worry about the strange forces on that rigid center arm (which is going to be tweaked every time the rear wheels move out of sync).

Mark Hickey Mesa, AZ 1978 Royale Center Kitchen

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Re: [GMCnet] Dual Bag... [message #281338 is a reply to message #281303] Thu, 02 July 2015 20:57 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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I've read the documentation that Firestone published and the bags used in the Quadra Bag, Four Bag, and Dual Bag are NOT meant to be
mounted horizontally and subjected to side loading.

They are meant to be mounted horizontally between the frame and a suspension component with minimal offset from horizontal, IIRC
it's something like 25°.

Please don't ask me for the Firestone reference I just don't have the time to look for it, sorry.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: G Mark

Silly question, but why not just eliminate the whole center arm / pivot? You'd end up with something pretty similar to a
single-bagger system...you'd still have the redundancy of being able to limp along with one bag blown (though with twice the
opportunity for a blown bag), and you wouldn't have to worry about the strange forces on that rigid center arm (which is going to be
tweaked every time the rear wheels move out of sync).
--
Mark

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] Dual Bag... [message #281339 is a reply to message #281300] Thu, 02 July 2015 20:52 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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David,

The flapper "pivot" was bolted down to the bolt that holds the brake line on the inside of the bogie and the bolt that holds the
center skirt on the outside of the bogie.

IIRC the flapper pivoted on a 3/8" bolt.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426


-----Original Message-----
From: David H. Jarvis

It may work if it was bolted down.

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: Dual Bag... [message #281344 is a reply to message #281266] Thu, 02 July 2015 21:34 Go to previous messageGo to next message
Chr$ is currently offline  Chr$   United States
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Location: Scottsdale, AZ
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I think the best airbag is the OEM, with the Sully Bag a close second. Sorry, I put the Quadrabag on my coach, and the ride got harder, and it lost the "magic" carpet ride quality where I could drive over a curb or small child and not even fell it... Rolling Eyes

Randy has the Sully Bags, and he's happy with them.

-Chr$: Perpetual SmartAss
Scottsdale, AZ

77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"

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Re: [GMCnet] Dual Bag... [message #281349 is a reply to message #281344] Thu, 02 July 2015 22:21 Go to previous messageGo to next message
Len Novak is currently offline  Len Novak   United States
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I run the dual bag here, nice ride, no issues

Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/





-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Chris
Choffat
Sent: Thursday, July 02, 2015 7:35 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Dual Bag...

I think the best airbag is the OEM, with the Sully Bag a close second.
Sorry, I put the Quadrabag on my coach, and the ride got harder, and it lost
the "magic" carpet ride quality where I could drive over a curb or small
child and not even fell it... :roll:

Randy has the Sully Bags, and he's happy with them.
--
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.

Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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Len and Pat Novak 1978 GMC Kingsley The Beast II with dash lights that work and labels you can see! Las Vegas, NV new email: B52sRule@Gmail.com http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375 www.bdub.net/novak/

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Re: [GMCnet] Dual Bag... [message #281350 is a reply to message #281339] Thu, 02 July 2015 22:21 Go to previous messageGo to next message
<rallymaster is currently offline  <rallymaster   United States
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On Fri, 3 Jul 2015 11:57:00 +1000 "Robert Mueller"
writes:




Rob, did you mean to say "VERTICALLY" in the following sentence?

They are meant to be mounted horizontally between the frame and a
> suspension component with minimal offset from horizontal, IIRC
> it's something like 25°.




> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
> -----Original Message-----
> From: G Mark
>
> Silly question, but why not just eliminate the whole center arm /
> pivot? You'd end up with something pretty similar to a
> single-bagger system...you'd still have the redundancy of being able
> to limp along with one bag blown (though with twice the
> opportunity for a blown bag), and you wouldn't have to worry about
> the strange forces on that rigid center arm (which is going to be
> tweaked every time the rear wheels move out of sync).
> --
> Mark
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>


Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II

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Re: Dual Bag... [message #281351 is a reply to message #281344] Thu, 02 July 2015 22:54 Go to previous messageGo to next message
Bob de Kruyff   United States
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Registered: January 2004
Location: Chandler, AZ
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Chr$ wrote on Thu, 02 July 2015 20:34
I think the best airbag is the OEM, with the Sully Bag a close second. Sorry, I put the Quadrabag on my coach, and the ride got harder, and it lost the "magic" carpet ride quality where I could drive over a curb or small child and not even fell it... Rolling Eyes

Randy has the Sully Bags, and he's happy with them.

Chris--how dare you express an opinion like this on this forum Smile

Bob de Kruyff
78 Eleganza
Chandler, AZ

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Re: [GMCnet] Dual Bag... [message #281352 is a reply to message #281350] Thu, 02 July 2015 23:00 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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Location: Sydney, Australia
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Oops!

Yes it should read:

They are meant to be mounted VERTICALLY between the frame and a suspension component with minimal offset from VERTICAL, IIRC it's
something like 25°.

Regards,
Rob M.



-----Original Message-----
From: rallymaster@juno.com

Rob, did you mean to say "VERTICALLY" in the following sentence?

They are meant to be mounted horizontally between the frame and a
> suspension component with minimal offset from horizontal, IIRC
> it's something like 25°.

Ron

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] Dual Bag... [message #281354 is a reply to message #281352] Thu, 02 July 2015 23:07 Go to previous messageGo to next message
ljdavick is currently offline  ljdavick   United States
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i have the 4-bag system and was concerned about potential failure until I fully understood the failure mode (delusionally I comfort myself with phrases like “fully understood.”) The center pivot may not be robust enough to withstand the twisting that the bogies like to do when turning. I believe with my true trackers the twisting is held in check, and therefore my need to worry about this issue is minimized.

Just what I think I know.

Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA

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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy

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Re: Dual Bag... [message #281397 is a reply to message #281266] Fri, 03 July 2015 13:06 Go to previous message
biggreen is currently offline  biggreen   United States
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We use that same bag (the double humper) in the body shop on the frame rack as a jack to lift the body when installing anchor clamps.
Manufactured with a plate on the bottom and what you would see on a floor jack on the top. Made by, or for, Chief Industries.
Yeah, you would never want to use this device horizontally to push anything.
I agree the OEM was the best, and the Sullybag a close second, both for ride and price.

R.D. Northeast Florida 77 ex-Palm Beach 403

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