Home » Public Forums » GMCnet » [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118187 is a reply to message #118070] |
Wed, 09 March 2011 10:32   |
pbrownsd
Messages: 56
Registered: December 2010
Location: Hayden,ID
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It would be helpful to hear from someone who has this system in place for a "real-world" assessment. In my opinion, even if this product has some limitations the price still warrants consideration. With OEM bags now going for $600-700 each (and will only go higher as supplies depleat) and the quad-bag running $1600, then $600 per set sounds attractive. Of course, if limited travel makes the GMC ride like a brick then its no bargin.
1976 Glenbrook
Hayden, ID
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118221 is a reply to message #118187] |
Wed, 09 March 2011 16:12 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Or if the rear end collapses because of a GREAT idea that doesn't work out
in practice.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Pete
Sent: Thursday, March 10, 2011 3:32 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution
It would be helpful to hear from someone who has this system in place for a
"real-world" assessment. In my opinion, even if this product has some
limitations the price still warrants consideration. With OEM bags now going
for $600-700 each (and will only go higher as supplies depleat) and the
quad-bag running $1600, then $600 per set sounds attractive. Of course, if
limited travel makes the GMC ride like a brick then its no bargin.
--
1976 Glenbrook
Hayden, ID
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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] Fw: Hensley GMC Motorhome Airbag Solution [message #118244 is a reply to message #118221] |
Wed, 09 March 2011 20:30 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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I think this guy came up with a good solution. He said he would give us some ride height measurements on the next installation he does. The ride comfort is a subjective measurement so I say all you can do here is drive a coach with them installed or ask someone who already has them installed. So give him a chance and wait for his follow up before ruling out his very neat solution.
I use to run into the NIH (Not Invented Here) factor all the time with my clients. I hope we are not getting into this same thing with Mr. Hensley.
Go for it, Mr. Hensley. I for one will be watching. I do not need any air bags at this moment but if I did I would definitely look at your solution.
Rob gave us weight capabilities on the bags that the two 4 bag systems are using. I have to assume that the weight rating is similar on the one he is using using. In the 4 bag systems the bags are lashed together in series so you will not get any more weight capability on 4 bags than you get with his two bags. So the only question I see is how far will it go up and down as compared to OEM.
For comparison purposes I would sure love to see the specifications on the original bag as far as travel and weight carrying capability.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Wed, 09 March 2011 22:47] Report message to a moderator |
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118246 is a reply to message #118244] |
Wed, 09 March 2011 20:38 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Ken,
Very well stated. We need innovation and people commited to making actual product for our GMC's. Dan has commited time and energy to developing and manufacturing -- lets support his effort. Some of our existting GM vendors have not always been without issue when they bring a product to our market.
Dennis
Dennis Sexton
73GMC
Germantown, TN
USA
-----Original Message-----
From: Ken Burton <n9cv@comcast.net>
To: gmclist@temp.gmcnet.org
Sent: Wed, Mar 9, 2011 8:30 pm
Subject: Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution
I think this guy came up with a good solution. He said he would give us some
ide height measurements on the next installation he does. The the ride comfort
s subjective measurement so I say all you can do here is drive one with them
nstalled oor ask someone who already has the installed. So give him a chance
nd wait for his follow up before ruling out his very neat solution.
I use to run into the the NIH (Not Invented Here) factor all the time with my
lients. I hope we are not getting into this same thing with Mr. Hensley
o for it, Mr. Hensley. I for one will be watching. I do not need any air bags
t this moment but if I did I would definitely look at your solution.
Rob gave us weight capabilities on the bags that the two 4 bag systems are
sing. I have to assume that the weight rating is similar on the one he is
sing using. On the 4 bag systems the bags are lashed together in series you
ill not get any more weight capability on 4 bags than you get with his two
ags. So the only question I see is how far will it go up and down as compared
o OEM.
For comparison purposes I would sure love to see the specifications on the
riginal bag as far as travel and weight carrying capability.
Ken B.
-
en Burton - N9KB
6 Palm Beach
ebron, Indiana
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118254 is a reply to message #118244] |
Wed, 09 March 2011 21:23 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma: 0
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| Ken Burton wrote on Wed, 09 March 2011 20:30 |
I think this guy came up with a good solution. He said he would give us some ride height measurements on the next installation he does. The the ride comfort is subjective measurement so I say all you can do here is drive one with them installed oor ask someone who already has the installed. So give him a chance and wait for his follow up before ruling out his very neat solution.
I use to run into the the NIH (Not Invented Here) factor all the time with my clients. I hope we are not getting into this same thing with Mr. Hensley
Go for it, Mr. Hensley. I for one will be watching. I do not need any air bags at this moment but if I did I would definitely look at your solution.
Rob gave us weight capabilities on the bags that the two 4 bag systems are using. I have to assume that the weight rating is similar on the one he is using using. On the 4 bag systems the bags are lashed together in series you will not get any more weight capability on 4 bags than you get with his two bags. So the only question I see is how far will it go up and down as compared to OEM.
For comparison purposes I would sure love to see the specifications on the original bag as far as travel and weight carrying capability.
Ken B.
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i thought one of the selling points on the 4 bag system was that if you had a flat the other bag would take the total weight. did i miss understand that?
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118268 is a reply to message #118254] |
Wed, 09 March 2011 22:39 |
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It does. And, it puts the other bag out of spec on the recommended maximum
psi. As JimB says, it lets you get to the edge for a repair instead of
blowing out the side of the coach.
In the end, it's all about risk management.
Preferred ride.
And money.
--
Byron Songer
1978 GMC Royale
Louisville, KY
http://www.gmceast.com
http://web.me.com/bnsonger
Fred Veenschoten wrote:
> i thought one of the selling points on the 4 bag system was that if you had a
> flat the other bag would take the total weight. did i miss understand that?
>
> --
> Fred V
> '77 Royale RB 455
> P'cola, Fl
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--
Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
http://www.songerconsulting.net
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118277 is a reply to message #118254] |
Thu, 10 March 2011 00:36 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Fred,
I posted this data awhile back and no one commented.
Reference GMC Motorhome Operating Manual X-7521A (issued 1974)
GVWR (Gross Vehicle Weight Rating) represents the maximum permissible loaded
weight of the vehicle.
26 foot GMC GVWR = 11,700 lbs
GAWR (Gross Axle Weight Rating) the maximum weight that the axle can carry.
26 foot GMC GAWR
GAWR = 4,200 lbs Front Wheels
GAWR = 7,500 lbs Rear Wheels
Tire Load Range: The max load a tire can carry and the max pressure.
D load range max load @ 65 PSI = 2,235 pounds
E load range tire max load @ 80 psi = 2,680 pounds
The weight distribution per tire would be dependant on the how much pressure
the GMC driver applied manually to the air bag supporting the remaining tire
or the Powerlevel/Electrolevel systems applied automatically. For arguments
sake lets say it is what the two tires supported. Using the rear GAWR noted
above the load on the tire would double going from 1,875 pounds to 3,750
lbs.
The overload would be 1,515 pounds (68%) on a D range tire at 65 psi.
The overload would be 1,070 pounds (40%) on an E load range tire at 80 psi.
If the tires are not inflated to these pressures the overload would be even
higher.
It should be noted that using the 11,700 GVWR noted in the manual is
actually a low number. Ken Burton posted the average weights on each of the
wheels of the coaches that were weighed at the DuQuoin GMCMI Convention. I
added them together and came up with a weight of 12,563 pounds. If you would
like to see the message in which Ken posted that information it is message
#101370 on the Forum.
The bottom line is that if you drive your GMC with one tire removed (or one
air bag blown) you WILL be operating the GMC with the remaining rear tire
overloaded.
I am of the opinion that it is not safe to do that.
In one of the responses I sent in to this question I noted that if I was a
couple of miles out of town I'd probably do it. However, upon reflection I
don't think I would do it. The reason being I hadn't taken into
consideration that I could damage the remaining tire. I would proceed at
slow speed to the closest spot where I could effect repairs.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of fred veenschoten
Sent: Thursday, March 10, 2011 2:24 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution
i thought one of the selling points on the 4 bag system was that if you had
a flat the other bag would take the total weight. did i miss understand
that?
--
Fred V
'77 Royale RB 455
P'cola, Fl
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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] Fw: Hensley GMC Motorhome Airbag Solution [message #118281 is a reply to message #118277] |
Thu, 10 March 2011 00:54 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Robert Mueller wrote on Thu, 10 March 2011 00:36 |
Fred,
I posted this data awhile back and no one commented.
Reference GMC Motorhome Operating Manual X-7521A (issued 1974)
GVWR (Gross Vehicle Weight Rating) represents the maximum permissible loaded
weight of the vehicle.
26 foot GMC GVWR = 11,700 lbs
GAWR (Gross Axle Weight Rating) the maximum weight that the axle can carry.
26 foot GMC GAWR
GAWR = 4,200 lbs Front Wheels
GAWR = 7,500 lbs Rear Wheels
Tire Load Range: The max load a tire can carry and the max pressure.
D load range max load @ 65 PSI = 2,235 pounds
E load range tire max load @ 80 psi = 2,680 pounds
The weight distribution per tire would be dependant on the how much pressure
the GMC driver applied manually to the air bag supporting the remaining tire
or the Powerlevel/Electrolevel systems applied automatically. For arguments
sake lets say it is what the two tires supported. Using the rear GAWR noted
above the load on the tire would double going from 1,875 pounds to 3,750
lbs.
The overload would be 1,515 pounds (68%) on a D range tire at 65 psi.
The overload would be 1,070 pounds (40%) on an E load range tire at 80 psi.
If the tires are not inflated to these pressures the overload would be even
higher.
It should be noted that using the 11,700 GVWR noted in the manual is
actually a low number. Ken Burton posted the average weights on each of the
wheels of the coaches that were weighed at the DuQuoin GMCMI Convention. I
added them together and came up with a weight of 12,563 pounds. If you would
like to see the message in which Ken posted that information it is message
#101370 on the Forum.
The bottom line is that if you drive your GMC with one tire removed (or one
air bag blown) you WILL be operating the GMC with the remaining rear tire
overloaded.
I am of the opinion that it is not safe to do that.
In one of the responses I sent in to this question I noted that if I was a
couple of miles out of town I'd probably do it. However, upon reflection I
don't think I would do it. The reason being I hadn't taken into
consideration that I could damage the remaining tire. I would proceed at
slow speed to the closest spot where I could effect repairs.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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PLUS you are also doubling the weight on the remaining air bag and bogie. Will the bag hold this amount of weight? I'm also wondering if you would bend the bogie arm attempting this.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118290 is a reply to message #118281] |
Thu, 10 March 2011 06:49 |
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Not that it matters but I totally agree. You can probably push the upper
limits of anything but why push and risk damage in ways you don't think
about that will rear it's ugly head on into the future if not immediately?
As I said in the last post, it is all about risk management (and how much
you want to pay now or later).
Thanks for the great info (which I did read earlier, Rob) and the affirming
response. I, too, think some bogie damage may occur.
Now, it's interesting that this information implies the GMC, as built, is a
two axle vehicle, not three. Toll booth operators want to stick it to us
when they count three wheels on the side. Of course, I always did question
their abilities at deductive reasoning.
--
Byron Songer
1978 GMC Royale
Louisville, KY
http://www.gmceast.com
http://web.me.com/bnsonger
Ken Burton wrote:
>
>
> Robert Mueller wrote on Thu, 10 March 2011 00:36
>> Fred,
>>
>> It should be noted that using the 11,700 GVWR noted in the manual is
>> actually a low number. Ken Burton posted the average weights on each of the
>> wheels of the coaches that were weighed at the DuQuoin GMCMI Convention. I
>> added them together and came up with a weight of 12,563 pounds. If you would
>> like to see the message in which Ken posted that information it is message
>> #101370 on the Forum.
>>
>> The bottom line is that if you drive your GMC with one tire removed (or one
>> air bag blown) you WILL be operating the GMC with the remaining rear tire
>> overloaded.
>>
>> I am of the opinion that it is not safe to do that.
>>
>> In one of the responses I sent in to this question I noted that if I was a
>> couple of miles out of town I'd probably do it. However, upon reflection I
>> don't think I would do it. The reason being I hadn't taken into
>> consideration that I could damage the remaining tire. I would proceed at
>> slow speed to the closest spot where I could effect repairs.
>>
>>
>> Regards,
>> Rob M.
>> USAussie - Downunder
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>
>
>
> PLUS you are also doubling the weight on the remaining air bag and bogie.
> Will the bag hold this amount of weight? I'm also wondering if you would bend
> the bogie arm attempting this.
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--
Byron Songer
Full-timing to enjoy the USA
Former owner but still an admirer
GMC paint schemes at -
http://www.songerconsulting.net
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118304 is a reply to message #118281] |
Thu, 10 March 2011 09:09 |
Don A
Messages: 895
Registered: October 2008
Location: Dallas, TX
Karma: 0
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Senior Member |
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PLUS you are also exceeding the max weight rating on one of those expensive Alcoa wheels.
Don Adams Dallas, TX
'76 26' Glenbrook, '90 Sidekick
rebuilt by R Archer, powered by J Bounds, Koba
[IMG]http://www.gmcmhphotos.com/photos/data/6109/G2.jpg[/IMG]
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118328 is a reply to message #118326] |
Thu, 10 March 2011 13:32 |
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cjonesgo
Messages: 69
Registered: June 2009
Location: Oakland CA
Karma: 0
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| roy1 wrote on Thu, 10 March 2011 10:57 |
If you reread mr Hensley's statement if his bag blows just continue driving on the blown bag a reasonable distance (surely slower). The coach will not bottom out the tires to the body.
Roy
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I think the "overrating" comments on wheels/tires/bags are in reference to the quadrabag system, and what happens when you loose a bag. The weight distribution is placed on a single bag/wheel/tire on the affected side.
The advantage of all these systems to get you to a safe spot to make repairs is a great benefit over the stock system in my opinion. Perhaps even worth a sacrifice in bag travel. I am eager to see the bag travel measurements from Mr. Hensley's setup. For that matter, I am not sure what the measurements are on the stock system. I'll have to test that out on my coach...
Being new to the GMC game, I am pleased to see such innovation and products that are coming from all the suppliers to help keep our coaches on the road. While different systems may fit different individual needs, they also fill gaps in the market. I am excited to see simple low cost options for bag replacement, as well as more involved solutions as well. The variety allows people to decide what they are after in both ride quality, and cost (near and long term) and select the product that best suits their style of driving and how they use their coach.
Having these bolt on solutions to the increasing problem of part obsolescence will keep our GMC's on the road for years to come. I applaud ALL the part suppliers and innovators that make owning a GMC possible. Thank you.
[Updated on: Thu, 10 March 2011 13:33] Report message to a moderator |
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| Re: [GMCnet] Fw: Hensley GMC Motorhome Airbag Solution [message #118493 is a reply to message #118488] |
Fri, 11 March 2011 23:01 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Bob, I am with you on this one. So far, no problems with the Q bag doing it for us. I often get comments. All I say is, I am level. I know it looks odd but I like for the shower water to run down the drain.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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