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Old 10-19-2007, 12:12 PM   #1
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Talking How Hensley Works - simplified

Found this while researching hitches.



YouTube - Lego Hensley Arrow Model
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Old 10-19-2007, 12:28 PM   #2
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Hensley has the same video on their website (Hensley Arrow).
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Old 10-19-2007, 02:01 PM   #3
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This would have been a better demonstration if the guy didn't exaggerate the magnitude of the sway when demonstrating the conventional hitch set-up and barely rotate the trailer with the Hensley Arrow set-up.

If you look beyond the biased comparison is does give you an idea of the differing functionality.
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Old 10-19-2007, 02:08 PM   #4
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The Hensley principle is simple; lighten your wallet by $3000-works great! Much less mass to tow around...
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Old 10-19-2007, 03:33 PM   #5
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Quote:
Originally Posted by byamcaravanner
This would have been a better demonstration if the guy didn't exaggerate the magnitude of the sway when demonstrating the conventional hitch set-up and barely rotate the trailer with the Hensley Arrow set-up.
You have hit on the point of the little video, but might I suggest that you seemed to have missed that point. The amount of rotation shown with the conventional setup is not possible with the Hensley model, so that is why the trailer "barely" rotates, not because the demo is faked or biased.
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Old 10-19-2007, 04:06 PM   #6
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But he is clearly moving the tow vehicle less in the Hensley portion.
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Old 10-19-2007, 05:51 PM   #7
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I love it Bill I think that makes alot of sense By the way I'm hearing next week for deivery. I'll let you know
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Old 10-20-2007, 10:56 PM   #8
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Hello,

I'm still having trouble on where the force of the bow wave from a truck goes? Does it cause the trailer to "crab" behind the truck? The force has to go somewhere. BTW, I do think the Lego video is a bit biased myself. The same amount of force is not applied to the Hensley Lego model. That's clearly evident.

Doug
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Old 10-21-2007, 03:17 AM   #9
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some dealers have a big model to show you what you see on the video (CanAm in London - Ontario) and there is no way to have the TV move.
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Old 10-21-2007, 05:18 AM   #10
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Quote:
Originally Posted by dufferin
...and there is no way to have the TV move.
LOL! give it to my 7 year old twin boys... they'll show you how the can "move it" into a number of smaller pieces.

dufferin, If what you say is true, I wish he would have rotated the trailer in the Hensley demo equal to the demo on the standard hitch set-up. Then we could all see the differing affect on the tow vehicle.

Quote:
Originally Posted by Tim A.
You have hit on the point of the little video, but might I suggest that you seemed to have missed that point. The amount of rotation shown with the conventional setup is not possible with the Hensley model, so that is why the trailer "barely" rotates, not because the demo is faked or biased.
The amount of rotation of the trailer is in direct proportion to the force applied to the trailer. In the demo video, less force was applied to the Hensley trailer. The viewer has no way of knowing the conparative performance based on watching this video.
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Old 10-21-2007, 05:29 AM   #11
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Quote:
Originally Posted by byamcaravanner
dufferin, If what you say is true, I wish he would have rotated the trailer in the Hensley demo equal to the demo on the standard hitch set-up. Then we could all see the differing affect on the tow vehicle.
go check yourself
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Old 10-21-2007, 10:43 AM   #12
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Even though I am currently having sway problems with my new TV I would not consider a Hensley.

Yes, the Hensley may have divised a means of absorbing trailer sway before it is transmitted to the TV I have some questions. What does the Hensley do to dampen the sway. Does it just rely on the trailer tires to absorb and thus scuffing the tires unnecessarily.

If the Hensley allows an offset in the hitch as it's means of masking sway transmission it then has a reaction displacement of an equal amount when turning while backing up. On shorter trailer, that are inherently harder to control than longer ones, this could be significant in a tight spot.
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Old 10-21-2007, 11:12 AM   #13
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Quote:
Originally Posted by HowieE
Yes, the Hensley may have divised a means of absorbing trailer sway before it is transmitted to the TV I have some questions. What does the Hensley do to dampen the sway. Does it just rely on the trailer tires to absorb and thus scuffing the tires unnecessarily.

If the Hensley allows an offset in the hitch as it's means of masking sway transmission it then has a reaction displacement of an equal amount when turning while backing up. On shorter trailer, that are inherently harder to control than longer ones, this could be significant in a tight spot.
I may be oversimplifying the effect of the Hensley, but from my perspective it makes a travel trailer behave like a 5th wheel. The pivot point of a 5th wheel is over the rear axle, eliminating any leverage caused by having the pivot point behind the bumper. A Hensley essentially does the same thing with its trapezoidal linkage that creates a virtual pivot point farther forward - perhaps ahead of the rear axle for a tow vehicle with a very short rear overhang. So I don't think the Hensley can be described as a system for masking sway.

Effective hitch setup involves using all four tires of the tow vehicle to absorb and cancel sway. For that, you need sufficient WDH tension to put weight on the front tires. A low centre of gravity, stiff tires and a suspension system with lots of lateral stability all help.
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Old 10-21-2007, 12:37 PM   #14
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Quote:
Originally Posted by byamcaravanner
...I wish he would have rotated the trailer in the Hensley demo equal to the demo on the standard hitch set-up. Then we could all see the differing affect on the tow vehicle....
had the trailer been 'rotated' as suggested, with enough force...

the tv/trailer unit would have swung like a rigid pendulum....

as one straight unit (no bending at the hitch) with the tv tires ALL sliding in an arc....

as IF your child was rotating one big rigid stick!

and this would be a supernatural towing event, right?

5ers and ALL other hitches can be jackknifed...

a haha CANNOT be jackknifed, except when backing up....

angulation AT the hitch can ONLY be initiated by the steering tires, NEVER by the trailer.

so turning IS possilbe, as is backing up but unless the hitch BREAKS loose,

"tracking" is always linear, articulated sway is NOT possible, nor is jack knifing...

uniform side PUSH (wind, gravity, slope...) results in the ENTIRE RIG absorbing the force, like center-pushing on a long beam...

so YES the tires/lugs/hubs are stressed (on both vehicles) but the result is NO WIGGLE to correct with steering input.

during forward travel IF

1.some un-natural side force could push on just the BACK half of the trailer...

while...

2. another force from the opposite side pushed on the front half...

the hitch allows for 2-4 inches (approx) of side2side counter movement at the front, that the drive doesn't feel...

sorry folks it is only PARTLY like a 5'er...

IF a fiver had ONE WAY compression/ struts running along EACH side connecting the tv/trailer, ALONG with the pin, it would be a closer match....

but they don't.

cheers
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