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Old 01-15-2010, 07:26 PM   #43
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Quote:
Originally Posted by Jammer View Post
... The whole point behind WD bars is to keep the rear axle suspension of the truck in an area where the spring rate is lower...
not so.

the primary reasons for using w/d bars are...

- to RESTORE steering axle loads to the UNhitched/normal load...

-and because the RECEIVERs are rated higher than 'on the ball' ONLY when w/d gear is used.
_____________

the stream is stressed by high amplitude/low frequency bumps/holes, and low amplitude/high frequency stuff (road surface)

but MOST of the load rides on the trailer axles and tires, not the tongue.

one would need to measure the htz of each type of vibe over a LONG period and assess the reaction of the metal to this...

this can't be simply computer modeled, because of the hi VARIABILITY in build characteristics for each stream...

in any one year or decade, or model change or FRAME change or SHELL change (skin/rivets/ribs/floors) that's part of the product history.

the axle manufacturer has changed, the specs have changed, the tv have changed, tires have changed and so on...

60s or 70s data (if it existed and it doesn't) would NOT apply to ANY current 'stream.

they are built VERY DIFFERENTLY now.

this has been done for example with HUMANS riding/sitting in vehicles,

such that we now know when htz is most damaging to the human spine with prolonged exposures...

the differences between exposure to HIGH amplitude and LOW amplitude stuff on the spine.
____________

and the trailer frame flexes/extends/rotates when placed on the ball or with w/d tension...

this happens when PARKED as well as with movement.

but a 38 year old trailer with missing rivets or shell/frame issues is just an old trailer that's been used.

tired axles, old frame, old skin, old rivets and road weary and connected to a variety of mules over those 4 decades.

the skin/rivets are also stressed by WIND and air pressure while towing.

ANY aluminum riveted thing that old with miles would have loose/missing rivets or other signs of fatigue.

streams don't get inspected and regularly maintained like flying machines or boats as examples.

using 500 lb w/d bars with a 1000 lb tongue is POINTLESS for w/d unless the tv is otherwise modified.
_____________

much more on this stuff is posted here.

find the "body separation" thread and see hiho's work linked in post 35 above.

cheers
2air'
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Old 01-15-2010, 08:37 PM   #44
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FCJ,
Really cool thread...
I just typed a long response...now gone into cyberspace...

I think real hitch/overhitch issues won't come from accel number but from stress gaging the A-frame.

It's easy to argue both sides of it. Big, sloppy vehicles allowing things to whip and flop things into pieces. Not much acceleration but a huge amount of energy in the low frequency, high ampliture sinusoids.

Tight suspensions that keep the ball from jumping up and down (Use a locomotive and the hitch will never bounce or move, thus never transfering any rivit popping energy into our egg like shells). But it does transfer small amplitude higher frequency energy that will cause cyclic failure.

Tight WD bars that lock stuff together and minimize flopping. Spingy Bars that don't pull on the A-frame...

As we know, the numbers tell the truth, not Cause-and-Effect speculating. I can say that new axles/Old axles, Heavy WD bars/No WD don't make much of a difference in the energy transfer from the road to the trailer.

Keep up the good work...ya got a few strain gauges and some paint stripper?
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Old 01-10-2015, 07:49 PM   #45
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Still a great thread. Joe, did you continue with this test series elsewhere?
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Old 01-10-2015, 08:07 PM   #46
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Great stuff!


Sent from my pocket Internet using Airstream Forums
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Old 01-11-2015, 10:42 AM   #47
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Quote:
Originally Posted by ROBERT CROSS View Post
Joe,

Just ordered this two days ago, tired of guessing.

Seems like a VG product, I'll let you know.

Sherline Trailer Tongue Weight Scales
I bought a Sherline last summer.....interesting, when I weighed the tongue the first time. I found that the weight on my 2001 30' Excella was about 125 pounds LESS than what some of the "experts" on here say it should be.

That being said, the next trip, we loaded a bunch of heavy stuff behind our recliners, and got the tongue weight up to 900 pounds. The trailer towed just fine before the increase in tongue weight, and there was no difference after I increased the weight...

For whatever it's worth

Larry C
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Old 01-12-2015, 12:17 PM   #48
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Still a great thread. Joe, did you continue with this test series elsewhere?
Thanks Slow'

Haven't touched my accelerometer gear since this experiment.
Maybe my son and I could finagle this into his science fair project...
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Old 01-12-2015, 12:50 PM   #49
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Inquiring minds want to know.

Sure beats papier- mâché volcanoes.

You know who to make it appear was doing the driving. And flying across the RR tracks with an external shot.

Boy, that would be fun.
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Old 05-05-2015, 06:31 AM   #50
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Struggling with stuff shaking to pieces inside my 31' Excella. Uses a Reese hitch and TV is a Chevy 3500 HD dually. AS tech says axles and shocks are good. 1000 # bars, 6 links. Other than trading my TV any suggestions?
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Old 05-05-2015, 06:44 AM   #51
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Struggling with stuff shaking to pieces inside my 31' Excella. Uses a Reese hitch and TV is a Chevy 3500 HD dually. AS tech says axles and shocks are good. 1000 # bars, 6 links. Other than trading my TV any suggestions?
I guess the first question I'd ask is; what do you mean by 'stuff shaking to pieces'?

- Tires balanced? I recently discovered tire balancing is like just about every other service out there- sometimes you don't get what you pay for. Had to go back to the tire shop twice, before they got it right on my Suburban.

The other item are your torsion bars. A '94 Excella 30' is listed as 750# tongue weight. I'm surprised you need (or are getting) any weight transfer at all with a 3500 dually.
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Old 05-05-2015, 08:24 AM   #52
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I actually had one name brand national tire shop tell me that trailer tires do not have to be balanced. I took my tires out of there as fast as I could and went to another shop that is used by most of the RV/trailer dealers in my area.
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Old 05-07-2015, 06:44 PM   #53
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I actually had one name brand national tire shop tell me that trailer tires do not have to be balanced. I took my tires out of there as fast as I could and went to another shop that is used by most of the RV/trailer dealers in my area.

I'm known at the local tire store as 'that guy that balances his trailer tires'
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Old 05-08-2015, 05:33 AM   #54
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Leaf spring has such short range of motion in some common co figs that tire balance is something of a nonstarter
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Old 05-08-2015, 07:12 AM   #55
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I use 800 pound bars with my one ton. Very little weight transfer us needed, but a little is just enough. Sway control is more important. The ride inside is okay with these bars. I wouldn't use any heavier bars than that. Jim
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Old 05-08-2015, 12:33 PM   #56
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Great test subject!!! This could be VERY VERY informative for users, hitch vendors, etc.

Thanks for thinking of this!
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