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Old 11-16-2015, 05:37 PM   #29
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rideair

You lucked out. The trailer riding parallel to the road requirement just does not applies to a single axle trailer. You can drop on the ball at any height an go. However from the picture above it does look like you did it anyway.

The set of a WD hitch become intuitive after you have done it a while but is not that easy to give written instruction to those that may be new to it.

avionstream.

I may have not been clear with this comment
Keep in mind if the trailer is riding high in the front that increases the tongue weight. If high in the rear that decrease it. Both will effect steering so get it close.

It refers to the trailer not the TV. This is a function of the fact that Airstream trailers have separate axles without the center conspirator common on most SOBs. As the front of the trailer is raised less weight is applied to the front trailer axle and thus the load on the tongue goes up. SeeSaw 101.

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Old 11-16-2015, 05:47 PM   #30
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Not convinced yet. Agree to disagree.
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Old 11-16-2015, 07:05 PM   #31
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Good thread.
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Old 11-17-2015, 06:22 AM   #32
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Don't forget about the center of gravity.
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Old 11-17-2015, 07:07 AM   #33
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Before starting this exercise to setup the WD hitch, a few preliminaries need to be addressed.

Make sure the tire pressure is set the same in all of the trailer tires, preferably with a digital pressure gage.

Make sure the tow vehicle tires have the same pressure in each pair (both front and both rear).

Nice to know information is the actual tire weight loading at each location. If one side is heavier than the other, one may have to compensate for this or reload the payload in the trailer.

Make sure the selected work area is as close to level as possible, both front to rear and left to right.

Changing the payload in either vehicle will impact the setup work just accomplished. Depending on the weight margins on the axle loads and GVW ratings, one may be okay with minor weight changes, But going from a full 54 gallon water tank to an empty one will definitely have an impact.
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Old 11-17-2015, 03:05 PM   #34
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Quote:
Originally Posted by HowieE
---As the front of the trailer is raised less weight is applied to the front trailer axle and thus the load on the tongue goes up.---
Quote:
Originally Posted by avionstream
Don't forget about the center of gravity.
You're both correct.

Lifting the tongue will decrease the front axle load (It also will increase the rear axle load). The tongue load will increase, but not nearly as much as the decrease in front axle load.

Lifting the tongue will cause a slight rearward movement of the location of the CG. This will cause a decrease in tongue load. The effect of CG movement will cause the tongue load increase to be reduced by about 25%.

Lowering the tongue will decrease the tongue load. This will have a slight effect on the "tongue weight" calculated from scales measurements if there is any appreciable drop in the rear of the TV with TT attached and no WD applied.

Ron
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Old 11-17-2015, 03:40 PM   #35
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Gone too long

Quote:
Originally Posted by Ron Gratz View Post
Yes, weight distribution is a function of lift applied to the WD bars -- along with distance from ball to lift brackets and distance from ball to midpoint between TT axles.
However, the amount of "lift" is a function of WD bar stiffness and the amount of "bend" which can be created by pulling up on the bar ends.

Increasing the rearward tilt of the ball mount causes the rear end of an unloaded WD bar to move farther below the lift brackets.
This means the bar end can be lifted a greater distance -- creating more bar curvature and more lift force (i.e. more downward force on the A-frame).

Yes, although not unanimous, that does seem to be the majority opinion of those posting in this thread.

Some setups require little or no rearward tilt in order to generate sufficient load distribution. Some require much or maximum tilt.

IMO, the primary function of a WDH is to add load back onto the TV’s front axle and to remove some of the load which was added to the rear. I believe any increase in yaw stability resulting from rearward tilt is a secondary benefit. Andrew appears to agree with this based on his statement: “Though the primary job of the equalizing hitch is to transfer weight to the front axle of the tow vehicle, how the weight is transferred impacts handling.”

Andrew goes on to state: “However, the main reason for the rearward angle is to change the direction of weight transfer so we have additional traction in sharp turns and additional stability at high speeds.” But, if by “additional traction” Andrew means more load on the TV axles, his ensuing narrative and his table of test results at the top of page 52 seem to show that extreme rearward angle causes the load transfer to remain essentially the same as TV/TT articulation increases. If there is no change in load, where does the additional traction and stability come from?

Furthermore, if you convert the front and rear heights from the table on Page 52 to estimated load changes using an assumed spring rate (I used 100 lb/inch/wheel, but any value can be used), the results indicate the angled mount at 22° gave virtually no load change on the TV while the vertical mount at 22° gave a load increase of about 100 # (using my value of 100 lb/inch/tire).

Of course, simply changing the TV/TT articulation from 0° to 22°should not change the load on the TV (as was the case for the angled mount) so I’m guessing there is an error in the data for the vertical mount. I’m also guessing that Row 2 of the table (“Tow vehicle with trailer in straight line”) applies only to Row 3 and does not apply to Row 5. If so, subtracting Row 5 from Row 2 would give erroneous results for Row 6.

IMO, the test results do not support the hypothesis that increasing the rearward angle gives additional traction in sharp turns and additional stability at high speeds. And, even if there is benefit at articulation of 22°, there is no evidence of any benefit at articulation around +/- 5° which is the range of interest for sway control. Perhaps this is why Andrew recommends using a friction sway control when the WDH does not have integrated SC.

In short, I am not convinced that extreme rearward tilt of the ball mount is a substitute for other means of sway control -- the bicycle forks argument notwithstanding.

Ron

BTW -- If we want to make this a Minnesota thread, we lived in Ely prior to becoming full-time RVers.


Ron,
You have been gone too long to consider yourself a Minnesotan. It is possible to restore your status but it is very involved. A check would have to be done on your winter clothing, an accent check would have to be done and a check of your recollection of envied sayings: ie, ya sure, Ohhhhhhhh and many others. It is possible though.
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Old 11-17-2015, 04:24 PM   #36
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Super forum

I am absolutely blown away by reading the many fantastic posts to this thread. Some of the respondent are so intelligent that I have no idea what they are talking about. I still like to read them though. It really is amazing the wealth of knowledge available for the asking. It is a good testament to the caliber of individuals that own Airstreams. Now that I own one again I hope I get smart too.
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Old 11-17-2015, 06:46 PM   #37
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Howie, GREAT post! Thanks.
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Old 11-18-2015, 08:18 AM   #38
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Super Forum - weight distribution

Quote:
Originally Posted by dickschaak View Post
I am absolutely blown away by reading the many fantastic posts to this thread. Some of the respondent are so intelligent that I have no idea what they are talking about. I still like to read them though. It really is amazing the wealth of knowledge available for the asking. It is a good testament to the caliber of individuals that own Airstreams. Now that I own one again I hope I get smart too.
WOW I could not agree more !!!
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