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03-30-2012, 08:24 AM
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#21
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Rivet Master 
2012 25' Flying Cloud
Battle Lake
, Minnesota
Join Date: Jun 2009
Posts: 7,714
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Quote:
Originally Posted by TG Twinkie
It happens even when you are not towing the trailer when the axle spacing on the TV is the right length.
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True, same problem with our VW camper Eurovan (new Bilstein shocks installed) on certain stretches of road.
doug k
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03-30-2012, 08:36 AM
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#22
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Maniacal Engineer
1971 25' Tradewind
Lopez Island
, Washington
Join Date: Jan 2010
Posts: 1,244
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I added air lifts to our F250 to help keep things level when carrying a lot of stuff and towing; this has allowed me to largely tune that out of the suspension. I carry about 20 lbs of air when towing, and things are much better. The longer trucks are less subject to this I think.
- Bart
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03-30-2012, 09:50 AM
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#23
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Rivet Master 
1966 24' Tradewind
Placerville
, California
Join Date: Apr 2006
Posts: 3,328
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'Years ago' before considering towing an Airstream we towed a 2000 lb popup with the same car. This problem here and other issues almost discouraged me from moving up to the Airstream. Never heard of WDH. I quickly discovered that no amount of air pressure in the rear air shocks would lower the front of our Buick. My neighbour came to our rescue by GIVING us his old WDH setup that was in his shed for years. It is a 1000 lb bar setup which sounds like too much but is perfect. Towing our Airstream is SO much better than the popup.
Neil
__________________
Neil and Lynn Holman
FreshAir #12407
Avatar;
Kirk Creek, Big Sur, Ca. coast.
1966 Trade Wind
1971 Buick Centurion convertible
455 cid
1969 Oldsmobile Ninety Eight
455 cid
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03-30-2012, 11:02 AM
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#24
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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Quote:
Originally Posted by tpi
I think there's some combination of wheelbase, spring rates, and who knows what else that causes porpoising in some trailer/tow vehicles on certain stretches of concrete highway.
Probably every rig has its harmonic frequency and you don't want it to be at speeds you drive.
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Yes. Lots of factors go into this and what works everywhere else may not work on a specific section of road with the expansion joints at just the perfect distance to resonate with your rig. A perfect set up will not be perfect for every road and somewhere out there is a road waiting for you to rattle your teeth.
We noticed it in S. Cal., a place where it is often reported whether towing or not. There is a section of I-70 east of Denver near Limon where it is very bad. We haven't noticed it many other places, but when it happens, it is almost always on a concrete roadway. Long before we had a trailer, it would happen sometimes on some concrete roads regardless of what vehicle we were driving.
This can also happen on a gravel road when it has a lot of washboard. Same principle. Sometimes going faster helps, sometimes slower, sometimes nothing helps. Putting the tow vehicle in 4WD on gravel can improve stability on gravel. We try to find a speed that doesn't resonate with the road surface and hope the overhead cabinets aren't on the floor by the time we finish that stretch of road.
Gene
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03-30-2012, 12:06 PM
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#25
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Wise Elder
2010 30' Classic
Vintage Kin Owner
South of the river
, Minnesota
Join Date: Dec 2009
Posts: 4,169
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Quote:
Originally Posted by tpi
The porpoising is surely uncomfortable
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Especially for well-endowed women. I was giving one of my women friends a ride once and hit a bad stretch and she must have felt terrible. Wasn't anything I could do about it though.
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03-30-2012, 12:18 PM
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#26
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by Jammer
Especially for well-endowed women. I was giving one of my women friends a ride once and hit a bad stretch and she must have felt terrible. Wasn't anything I could do about it though.
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Not without letting go of the wheel anyway.... 
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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03-30-2012, 10:05 PM
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#27
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moderator
Commercial Member
2016 27' International
Currently Looking...
Wilton
, California
Join Date: Aug 2008
Posts: 1,711
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Oh Bob..... 
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03-31-2012, 12:11 AM
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#28
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Maniacal Engineer
1971 25' Tradewind
Lopez Island
, Washington
Join Date: Jan 2010
Posts: 1,244
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Quote:
Originally Posted by Jammer
Especially for well-endowed women. I was giving one of my women friends a ride once and hit a bad stretch and she must have felt terrible. Wasn't anything I could do about it though.
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Good to keep an eye on things just in case of trouble, though.
- Bart
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03-31-2012, 03:57 AM
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#29
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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Quote:
Originally Posted by Jammer
Especially for well-endowed women. I was giving one of my women friends a ride once and hit a bad stretch and she must have felt terrible. Wasn't anything I could do about it though.
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Had the same thing happen to me in my ski boat. 
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03-31-2012, 05:40 AM
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#30
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by r carl
Had the same thing happen to me in my ski boat. |
Nice thing about boats though....the hair is always more important. 
Bob
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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03-31-2012, 09:09 AM
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#31
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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You must always provide support to a distressed woman.
Gene
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03-31-2012, 11:40 AM
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#32
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More than one rivet loose
Currently Looking...
Los Alamos
, New Mexico
Join Date: Feb 2006
Posts: 3,756
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slow down. It is road wear caused by Tractor Trailers.
__________________
Michelle TAC MT-0
Sarah, Snowball 
Looking for a 1962 Flying Cloud
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03-31-2012, 12:12 PM
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#33
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Rivet Master
1981 27' Excella II
mays landing
, South Jersey
Join Date: Nov 2009
Posts: 1,179
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Quote:
Originally Posted by CrawfordGene
You must always provide support to a distressed woman.
Gene
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I once a long time ago gave a "distressed woman" a ride on the back of my Lambretta. It was winter time but my ears stayed warm. Sal.
__________________
Sal & Nora
Let us live so that when we die even the undertaker will be sorry. Mark Twain
AIR 42483
TAC N.J. 17
WBCCI 24740
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03-31-2012, 01:15 PM
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#34
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Rivet Master
2008 19' Safari SE
Denver
, Colorado
Join Date: Nov 2011
Posts: 950
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OMG. You guys are hilarious. Somehow all of the threads recently have been turning into That Thread. I've been waiting for the worn out coupler thread to sink too...
__________________
"If you can't be a good example, then you'll just have to be a horrible warning." - Catherine Aird
Blog: 300 Miles or 3:00
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03-31-2012, 01:26 PM
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#35
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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Quote:
Originally Posted by zlee
I've been waiting for the worn out coupler thread to sink too...
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Spring is early this year and our thoughts are turning that way. Imagine being in your Airstream with your partner when it is porpoising—what opportunities are available?
Sal, I never thought of them as "ear muffs". I wonder how I can explain this to my wife if I forget a hat when it is cold.
Gene
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04-06-2012, 06:21 AM
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#36
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Rivet Master
Vintage Kin Owner
Lin
, Ne
Join Date: Dec 2009
Posts: 2,430
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When I was a kid my friends grandma had to throw hers over her shoulders in order to do the dishes. 
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04-09-2012, 03:32 PM
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#37
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flygrrl
1962 19' Globetrotter
Winchester
, Ontario
Join Date: Jul 2011
Posts: 251
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Whoa!
Seems to me y'all are on the wrong thread, or is this a hijacking?
LOL
Gods, I love this forum more every time I log on.
Leonie
AKA Babe the Builder
__________________
TV: 2007 Jeep GC Laredo diesel
Toy: 1995 Jeep YJ
Experience is what you get from not having it when you needed it.
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04-09-2012, 07:22 PM
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#38
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Vintage Kin
Fort Worth
, Texas
Join Date: Nov 2006
Posts: 8,014
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I have BILSTEIN on my truck at present, but the new KONI FSD would be an upgrade. Available for GM and DODGE trucks in 3/4 & 1T.
The "lever arm" of the trailer ball-coupler-to-axle-center distance has a good bit to do with this. A non-compliant suspension makes it worse (so get the WDH dialled in correctly), and, put some TT's together with some TV's and the problem is magnified.
Moho's are affected by porpoising as are tractor trailers (try mis-gauging the axle load on one of those and it'll pound you to beans). Better shock absorbers (past loading/rigging details) are the next best step.
I hate it as much as anyone. Oklahoma turnpikes can be bad on this.
.
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