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Old 12-07-2015, 06:29 PM   #99
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Hi Ron,

Yes, I do understand what is involved, but frankly did not think that a 1/8" bevel just to knock the sharp corner off the stinger would have any significant impact on its strength.

Brian
You're correct...it doesn't have any effect...its not even remotely possible.

That said, it would have been useless. It would take a significant chamfer to improve initial insertion and if you relied on that, the stinger would force the head out of alignment as it continues to slide into the head and stop you cold. Does it sound like I may have attempted this?
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Old 12-07-2015, 06:47 PM   #100
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You're correct...it doesn't have any effect...its not even remotely possible.

That said, it would have been useless. It would take a significant chamfer to improve initial insertion and if you relied on that, the stinger would force the head out of alignment as it continues to slide into the head and stop you cold. Does it sound like I may have attempted this?
Luckily I seem to have at last honed my "Hensley hitching skills" (with the aid of a couple of gadgets) that I can pretty much be assured of a good hitch first
try, single handed - in fact I prefer to do it without any help!

And it only took me a year or two to develop the method that works best for me!

Brian.
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Old 12-08-2015, 06:24 PM   #101
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Ron I was thinking what you said about Pitch Axis and am curious how the hitch controls the loads created when the axis of the trailer and truck change on this axis.
As you correctly asked in an earlier post, " did we encounter any steep ramps on the BC ferries", this would change the axis or try to and the loads would be transmitted back from the truck through the hitch bar and into the bottom section of the hitch. They would then go up through the connecting links into the top section and to the ball. The movement between the ball and the trailer is restricted by the struts so where do the loads created by the pitch axis change go. As far as I can see they are taken up bey the connecting links. This is why Hensley install self aligning roller bearings in this area .
Does this ramble make any sense to you.

Norrie
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Old 12-08-2015, 06:31 PM   #102
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Thanks Jim Fowler for sharing your Hensley failure. I am sure there are a lot more out there that travelers have had repaired but never mentioned to anyone. Some people get a little self conscious about mentioning these things or brush it off as something that just happened. Especially if they paid a lot of money for it.
If this had happened in the automotive business there would have been a recall.

Norrie
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Old 12-09-2015, 10:19 AM   #103
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Norrie,

You're correct about the load path from truck to ball, and your explanation makes sense to me. The links are a critical part of this path.
The struts prevent any relative yaw-axis rotation between ball and coupler, but do not prevent relative pitch and roll.

The links transmit vertical loads via shear forces.
Pulling forces induce tension stress and braking forces (assuming TT is pushing forward against the hitch) result in compression stress.
Pitch axis torques result in bending moments in the links.
Resistance to "sway" generally is provided via tension in one link and compression in the other.

One scenario in which a link might get bent as shown in your photos, would be the TV/TT traversing a "dip" where the TV's front tires and/or the TT's tires are higher than the TV's rear tires.
This causes increased curvature and increased loading of a the WD bars.
The bars generate an increase in CCW (viewed from driver's side) torque which can be transmitted to the connecting links.
Whether this excess torque is ever likely to cause bending of the links is very hard to estimate.

Another scenario which can result in unusually high linkage stresses is when backing the TT into a large angle (close to 90).
At this point, the linkage is trying to push the entire TT sideways.
However, in this case, I would expect to see strut bracket shear bolt failure rather than bending of the links.

I hope your hitch problems are over.

Ron
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Old 12-10-2015, 01:54 PM   #104
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Thanks Ron. Excellent description of the mechanics of the hitch. I detect a lot of experience and knowledge in these words.
I am inclined to think the dip in the road may have caused it but this brings up long term concerns about the limit of the pitch axis angle of the hitch. I also think the material spec for the links may have changed and they are using a lower quality of steel for this part. Time and distance will tell.
The repaired, re warrantied hitch is due to arrive today so we can get on the road for San Diego. I will be monitoring the hitch continuously.
Thanks for all your advice and comments and thanks to all the post contributors.

Norrie
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Old 12-11-2015, 11:02 AM   #105
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Hensley Cub - beefy enough?

I'm researching hitches and am considering the Hensley Cub for my 2015 19' Flying Cloud. Not anywhere the weight/length of your trailer but it is a much lighter version of the Hensley Arrow. Now I wonder if some situations may result in a bent hitch like you had experienced. Does anyone have experience or advice on the Hensley Cub hitch?
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Old 12-12-2015, 07:22 AM   #106
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The draw back to the "CUB" model is a very limited upgrade path on trailer size and weight if the owner gets a severe case of "two foot itis" and wants a bigger trailer in the future.

Then the lower initial cost of the "CUB" is negated by the additional cost of acquiring the larger Arrow model.

We are using the Arrow we had on the 25FB on the 23D and it works fine.
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Old 12-12-2015, 11:52 AM   #107
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In reference to the Hensley's being bent and common repairs, I can confirm from my own experience, they do A LOT of repairs. However, in some cases, the issue will go unnoticed and/or Hensley will call it normal. I will show you via my own personally pictures. Many of these failures cannot occur on the Propride, as the differences in the design eliminates some of these components...like the strut bars and multiple pins.

Bent strut bar...on its way back to Hensley. This is how it arrived FYI.



A common strut failure at the mounting point and improper repair not allowing the strut pin to fully seat, thus blocking access to the locking clip hole. This is yet another "as received" defect.




Below are 3 of my own pics and then one not mine, showing where another specific failure mode ends. It was this final straw that broke the camels back, and I returned my hitch back to Hensley.

What your looking for is air gaps between steel plates and how they are no longer parallel. The caliper measures an 1/8" bend in the plates, which will only get worse over time, or fail on the road.

This could potentially happen to the Propride as well, but I have yet to see it.







This pic is not mine...but I have collected many like it. Its where mine was leading.

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Old 12-12-2015, 01:44 PM   #108
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How much of a Pitch/Dip can a pivot point projection hitch transit without incurring damage? Pat
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Old 12-12-2015, 02:10 PM   #109
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How much of a Pitch/Dip can a pivot point projection hitch transit without incurring damage? Pat
That would depend on the stiffness of what else is taking the pitch/dip, your trailer A-frame and the truck's receiver, and the amount of truck and/or trailer load applying pressure, as well as the speed at which it happens.

Enough pitch/dip and somethings got to give. I've read of some trailer A-frames and truck receivers being bent, and why some people have their tow vehicle receivers reinforced. It's a reason we load as little as possible behind our truck's rear axle, and try to keep our trailer hitch weight low.

Best to avoid it, if too severe an angle perhaps loosen the weight distribution to allow more flexibility under you've gone over it.
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Old 12-12-2015, 03:05 PM   #110
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DK - thanks for taking a shot at it. Any idea how much is too severe? Pat
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Old 12-12-2015, 03:17 PM   #111
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Hensley Arrow Hitch

Not to be snarky, but if the hitch WD bars drag or the back of the truck looses traction from being lifted up, that's probably too much of a dip or hump.

I try to find as level a path as possible to hopefully avoid scuffing the WD bars (yeah, they need painting again) or lifting the truck rear too much. If I'm in doubt, DW or I get out and looks at the situation. Sometimes you guess wrong and get noises😖

I do want to lift the AS up a bit because it's marginal now, and the new TV is a bit taller. A couple inches will help with driveway approaches.


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Old 12-12-2015, 03:22 PM   #112
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DK - thanks for taking a shot at it. Any idea how much is too severe? Pat
I have no idea, but I've seen gas station approaches that I have stayed away from where the roadway drops to almost a ditch, then back up again sharply into the station. Someone mentioned a ferry landing earlier, that might be quite a ramp.
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