| Weight and Balance [message #288902] |
Sat, 17 October 2015 10:15  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Does anyone have a feel for where the center of gravity front to rear falls on a 23' and 26' coach?
I've an implement trailer which fits four 7x14.5 lowboy tires. I can get load range tires which will hold a bit over 10,000 pounds but the CG would need to fall between the axles or very slightly in front. I know I can get a 23' on it, it might be possible to fit a 26' as well. You could tow it with a 2500 series or 3500 series pickup with a heavy duty hitch on. It would probably have to be loaded across a ditch, or with a pair of dollies under the coach rear to clear the overhang.... it would have to load front to front.
It needs a set of tires, but I don't want to spend the money on them unless a coach will fit on it.
Can some of the math gurus take wheel weights from a rally and determine the CG on both lengths?
--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: Weight and Balance [message #288908 is a reply to message #288902] |
Sat, 17 October 2015 13:13  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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Johnny Bridges wrote on Sat, 17 October 2015 10:15Does anyone have a feel for where the center of gravity front to rear falls on a 23' and 26' coach?
I've an implement trailer which fits four 7x14.5 lowboy tires. I can get load range tires which will hold a bit over 10,000 pounds but the CG would need to fall between the axles or very slightly in front. I know I can get a 23' on it, it might be possible to fit a 26' as well. You could tow it with a 2500 series or 3500 series pickup with a heavy duty hitch on. It would probably have to be loaded across a ditch, or with a pair of dollies under the coach rear to clear the overhang.... it would have to load front to front.
It needs a set of tires, but I don't want to spend the money on them unless a coach will fit on it.
Can some of the math gurus take wheel weights from a rally and determine the CG on both lengths?
--johnny There is a sample of weights near the bottom of this web page http://gmcws.org/Tech/TireSafety/ (Weigh-in Summary). I don't see any differentiation between 23 and 26 foot models. I suppose you could assume all 26 foot.
Using the Excel spreadsheet, front-to-rear CG in inches from the center of the front wheel for a 26' would be the weight on the rear wheels (column N) divided by the total weight (column O) multiplied by 160 inches (the wheelbase). So the CG for the first one on the chart at the above URL would be 12200 pounds 102 inches behind the front wheel (=N2/O2*160). The distance of the CG from the front wheel ranges from 93.5 to 108.6 (discarding a single outlier at 112.7) with an average distance of 102.7.
A trailer that can haul a bit over 10,000 pounds won't have the capacity to haul the typically overloaded GMC. Only a very small percentage will be haulable on your trailer. On that chart, only one out of 47 is less than 11,000 pounds.
[Updated on: Sat, 17 October 2015 13:36] Report message to a moderator |
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| Re: [GMCnet] Weight and Balance [message #288917 is a reply to message #288902] |
Sat, 17 October 2015 17:51 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Johnny,
I'm NOT a math guy but I just forwarded you a copy of a spreadsheet for the weigh in conducted at the Chippewa Falls GMCMI
convention last year I think it will help a math guy determine the CG.
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Johnny Bridges
Does anyone have a feel for where the center of gravity front to rear falls on a 23' and 26' coach?
I've an implement trailer which fits four 7x14.5 lowboy tires. I can get load range tires which will hold a bit over 10,000 pounds
but the CG would need to fall between the axles or very slightly in front. I know I can get a 23' on it, it might be possible to
fit a 26' as well. You could tow it with a 2500 series or 3500 series pickup with a heavy duty hitch on. It would probably have to
be loaded across a ditch, or with a pair of dollies under the coach rear to clear the overhang.... it would have to load front to
front.
It needs a set of tires, but I don't want to spend the money on them unless a coach will fit on it.
Can some of the math gurus take wheel weights from a rally and determine the CG on both lengths?
--johnny
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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: Weight and Balance [message #288919 is a reply to message #288902] |
Sat, 17 October 2015 19:05 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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It looks as if, with a set of really costly tires, it would haul a 23' unloaded. A 26 isn't going to be practical for more then five or ten miles, if that. Both would be a real fight to get on and off, Loading across a ditch would be the move. I'm gonna stick 4 craigslist take-offs on it and use it for hauling junk locally. Anybody wants to borrow, come get it and bring it back when you're done.
--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: Weight and Balance [message #289007 is a reply to message #288919] |
Mon, 19 October 2015 08:15 |
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thesmith
Messages: 589
Registered: February 2015
Location: Cary, NC
Karma: 6
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Add an extra axle to the Trailer? Never done it but when I was looking for a 3500lb hub for a battlebot (other hobby) it seemed that the likes of nothern tool or Harbor freight had all the parts to do that fairly easily if you have access to a welder.........
Pete
Cary, NC
1978 Center Kitchen Royale.
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