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Old 12-29-2012, 08:34 PM   #15
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Quote:
Originally Posted by Mike Canter View Post
Steve, you don't think the tag is added for weight carrying capability or did I read you wrong?

With DPs the rear axle position is more determined by the length of the diesel motor plus the Allison transmission then by a driveshaft that is sufficiently long to maintain the correct pinion angle on the u-joints through the complete movement of the rear control arms. The tag axle was first added to motorhomes that went above the weight that a single axle could carry. The slides and length is what increased the weight. When the weight of the mh increased the size of the motor got bigger to push it so the weight got even greater. On front engine motor homes the length of the driveshaft restricted how far back the rear axle could be. It is very difficult to make a three section driveshaft suspended via bearings to stop from going in and out of harmonics and vibrate so most try and restrict driveshafts to a single section or a dual section driveshaft with a single hanging bearing. Since front engine MHs have the weight of the motor to hold down the front it was easy to move the rear axle forward and to keep the driveshaft short.

A non tag side radiator also results in less overhang than a rear mounted radiator non tag.
I'm agreeing with you re weight.
When we build a truck we start with what's it got to carry
Where is the weight going to be like a crane or an Agitator.
So the basic bus or truck chassis can be shortened or lengthened. Axles added etc.
The chassis is cut in the middle near enough and lengthened to suit the "coach" being placed on the chassis.
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Old 12-29-2012, 09:01 PM   #16
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Tail swing is equal to the length from the center of the rear axel to the rear of the coach devided by four. In my case that's 3 feet, for most diesels that would be a foot less. For an equivelant length coach the added tail swing of a front engine is off set somewhat by the reduced off tracking of the rear weeks due to the shorter wheel base. I do think the diesels do handle the wind a bit better, tho I really don't have any complaints about my gasser.
Yes diesels handle well, including my front diesel A.
Weight distribution and balance. They designed mine pretty darn good.
I appreciate all the good info on this thread!
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Old 12-30-2012, 04:59 AM   #17
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So the MH model that is built on a 242" wheelbase that is 34' 10" (Allegro 34TGA) long would ride better than one that is 37' 4" (GeorgetownXL 378TS) long. The Allegro is also built on a 24,000 chassis while the Georgetown is built on a 22,000. I am concerned that the shorter one may ride to rough also, being it is not as big.
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Old 12-30-2012, 06:06 AM   #18
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its the trouble with upgrade or down

damn I dont notice the wind or pressure from trucks as much as notice and hate the fact that my long tailed 35ft bounder has dug up many roads and drive ways when you pull into a upward drive space or camping space, once even cut my dmn trailer electric cable in half.
and I have seen my trailer take a wild ride going over a :mound: in round as it tried to keep up with the wave of mh tail
this summer I will look at adjusting my tailer ball a bit higher to maybe get 3 more inched at tail
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Old 12-30-2012, 05:53 PM   #19
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I've read in numerous places suggesting the ratio of wheelbase to overall length is critical to a better handling coach, with over 50% being far better than under 50%.
Is that what we're talking about here?
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Old 12-30-2012, 06:56 PM   #20
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Well I have a long overhang (gasser) and I like it. I have a 16ft trailer and the "tail swing" helps me in and out of gas stations tremendously. No need for "wide right turns" or left.
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Old 12-30-2012, 07:58 PM   #21
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I seem to remember that they used to say for a gasser that the ratio of the wheel base to the overall length should be minimum of 52%
Not sure of this.
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Old 12-30-2012, 08:03 PM   #22
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I seem to remember that they used to say for a gasser that the ratio of the wheel base to the overall length should be minimum of 52%
Not sure of this.
JM2CW
Well, I have 3 front, 12 rear. Out of 33 is 45%. Must be different for a puller diesel, more motor weight? Sure does good!
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Old 12-30-2012, 08:04 PM   #23
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Well, I have 3 front, 12 rear. Out of 33 is 45%. Must be different for a puller diesel, more motor weight? Sure does good!
Oops. Pardon my math.
I have about 54%
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