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07-01-2013, 12:08 PM
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#1
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Senior Member
Join Date: Oct 2012
Location: Cambridge Ontario
Posts: 249
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Trailer porpoising
OK , wife's description, not mine.
Second trip with the new 23RB and Ford F150. This trip we had the two bikes in the truck, <700 lbs > and the trailer pulled better then ever. On most roads you would not even know it was there.
We did however hit one small section of road < concrete > near Buffalo that almost made me sea sick. The road had seams or joints in it every 25 feet or so. At 65 PMH the trucks front end would compress while the back went up , then as the front went up the rear would go down. Once I slowed to about 40 MPH it would stop. No sway at all but the bouncing would get worse once it started until it felt un safe to drive.
Other then one section of road only about 15 miles the ride felt solid. 70 mph , one hand on the wheel and transports going buy with no sway or weird pulling.
Any ideas ? I have never heard of this before.
Randy
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07-01-2013, 12:32 PM
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#2
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Site Team
Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
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Randy -
This up and down movement on concrete sections of highway that have expansion joints spaced in them is not uncommon and no cause to worry. At times, it almost feels as though you have a flat tire on your TT.
If you were going at 65-60 mph, it probably made it feel worse but even slowing down really doesn't help all that much. At 70 mph....well...... anything can happen to your tires at that speed.....
__________________
2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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07-01-2013, 12:39 PM
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#3
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Senior Member
Join Date: Aug 2011
Location: WESTERN,CT
Posts: 2,095
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HI Randy Two things One Your gaurdian angel was slapiing you silly for going 70mph and that may have contributed to the shakes. two welcome to buffalo. what you are felling is quite normall for that section of road
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BARNEY AND CHRISTINE
2010 MONTANA 3750FL
2005 DODGE 3500 DUALLY TD
2 RESCUE PUPS: SUSITNA AND CRYSTAL. RIP ALYESKA!
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07-01-2013, 01:09 PM
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#4
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Senior Member
Join Date: Oct 2012
Location: Cambridge Ontario
Posts: 249
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Thanks for the reply's guys. I guess there is not much I can do about it. I could not drive too far like that, I think I would be sick.
I do have to keep reminding myself to keep it around 100 kmh. Without the trailer I guess I have a bit of a lead foot at times.
The trip to Chapman State park was a success
Randy
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07-01-2013, 01:10 PM
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#5
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Site Team
Join Date: Jun 2009
Location: Venice
Posts: 5,346
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It's all a matter of harmonics. Length of wheel base, length from rear truck wheels to trailer wheels, spread of trailer axles and length of concrete slabs . When all the stars align, hang on tight. Sometimes it starts out as a slight thump, thump and stays fairly mild. Other times it grabs you and does not want to let go. Funny thing is we always seem to encounter this right after stopping for a nice meal.
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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07-01-2013, 01:18 PM
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#6
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Site Team
Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
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Quote:
Originally Posted by hankpage
It's all a matter of harmonics. Sometimes it starts out as a slight thump, thump and stays fairly mild. Other times it grabs you and does not want to let go. Funny thing is we always seem to encounter this right after stopping for a nice meal.
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Hank -
Sounds like this condition is something that might start right after stopping for a meal that wasn't so nice. But, like you said, "It's all a matter of harmonics". Hopefully, it will all stay "mild".
__________________
2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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07-02-2013, 07:26 PM
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#7
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,218
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Does you TT have shocks??
The two best things i have done for the ride of my TV and 5er are a set of Bilstien 5100's on the truck. Then installing shocks on both axles of the 5er! I towed a section of asphalt over OLD concrete. I could fel the joints in the truck, but no feel of the 5er pitching the pin.
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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07-03-2013, 01:23 AM
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#8
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
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The way I stopped this was a 172" wheelbase on my TV...
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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07-03-2013, 02:51 AM
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#9
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Senior Member
Join Date: Nov 2012
Location: Virginia
Posts: 865
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Quote:
Originally Posted by Javi
The way I stopped this was a 172" wheelbase on my TV...
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X2
Sent from my iPad using Tapatalk
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