tluxon
Kirkland, WA
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Milt, you're description doesn't show point C as being a straight continuation of the side links A-D and B-E. A force projected in a certain direction must remain in that direction or be converted to component forces that have a resultant that is equivalent to the originating force in magnitude and direction.
Tim
Tim -
wife Beverly & 2 boys who love camping
2002 K2500 Suburban 8.1L 4.10 Prodigy
2005 Sunnybrook 30FKS HP Dual Cam
Replaced 2000 Sunnybrook 26FK on 8/6/04
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tluxon
Kirkland, WA
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bettered wrote:OK, you're on. I'll even come and watch. Your rig, not mine.
Of course we would then have to admit this would be an experiement and in no way anything at all like real life... An "extreme" situation..
Ed Oh, I was just going to drive forward very slowly, almost like doing a u-turn left and then a u-turn right. Do you think it would be that big a deal?
Tim
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bettered
UpCountry SC
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Joined: 07/26/2004
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I see where you're coming from. Actually, most of the translation / swing occurs with the first 20 or 30 degrees of turn and just doing "pylon" type turns would demonstrate much of what you want to see. I saw a buddy's HA work that way as he was leaving a parking lot - it's impressive to see the ball (and all) swing across the centerline of the hitch bar.
It would be interesting to have someone with a tripod in the back of a vehicle with a camera focused on the hitch with enough field of view to see the entire arrangement as you've done with the previous video. Then do a series of increasingly deep turns. Much of the dramatic action at the hitch is within 20 = 30 degrees back and forth as the Orange part swings across the centerline pretty quickly!. Of course at the end of the arc when the hitch swings almost sideways would be pretty impressive as well - if you can get your TV to turn tightly enough to get there (without backing up..) I wonder..
That would seem like something Hensley might want to put up on their website. They've got to have this type of thing somewhere..
Ed
BetterEd
DW + 2 grandkids + Mini Schnauzer
2005 Chev 3500 Crew D/A 6.6L LLY, 6 x 6 DRW, 3.73
Tru-Flow + Banks, 2005 Flagstaff 831FKSS
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"Genius may have its limitations...." E. Hubbard 1856 - 1915
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jdwhittaker
York, SC
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bettered wrote:Actually Dave, I meant it exactly the way I said it. This is not even possible under the most extreme circumstances. What the video shows is extreme pivoting to the limit of hitch travel in either direction. Practically, it would be quite impossible to get your trailer out at nearly 90 degrees to your TV and then switch all the way over to the opposite side. I don't care whether it's a Hensley or not, by the time the TT is beside the TV you're both in the ditch on the roof.
My bad, I was attempting to help clarify what I thought was a rather broad statement. I like to try to avoid using terms like never, or always, I find them to be too absolute, which usually leaves me open to have a clever guy poke a hole in my story..belief...theory, or whatever. Sorry
BTW, I wasn't attempting to show potential angles of articulation in my video, but rather the HA,s motion. I'm aware that TV to TT interference can occur at those angles(approximately 165 degrees by Hensley Mfg.'s account).
Dave
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tluxon
Kirkland, WA
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On their marketing video they have a couple segments going through a slalom setup with a camera looking closely at the hitch. I'll record a clip and post it tonight if someone hasn't already.
Tim
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jdwhittaker
York, SC
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bettered wrote:...It would be interesting to have someone with a tripod in the back of a vehicle with a camera focused on the hitch with enough field of view to see the entire arrangement as you've done with the previous video. Then do a series of increasingly deep turns. Much of the dramatic action at the hitch is within 20 = 30 degrees back and forth as the Orange part swings across the centerline pretty quickly!. Of course at the end of the arc when the hitch swings almost sideways would be pretty impressive as well - if you can get your TV to turn tightly enough to get there (without backing up..) I wonder...
Ed,
I can attempt this , but I'm going to be out of town for a couple of weeks, so it will have to wait for a bit, unless somebody else can help out. Can't type today.
Dave
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bettered
UpCountry SC
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jdwhittaker wrote: I like to try to avoid using terms like never, or always, I find them to be too absolute, which usually leaves me open to have a clever guy poke a hole in my story..belief...theory, or whatever. Sorry
BTW, I wasn't attempting to show potential angles of articulation in my video, but rather the HA,s motion. I'm aware that TV to TT interference can occur at those angles(approximately 165 degrees by Hensley Mfg.'s account).
Dave
Not to worry Dave, when you get to be an old fart (like some of the posters here - this one in particular) you'll have learned that you have to qualify everything 'cuz there's always some smart-a** (like me) around looking to score a point. There actually are a few times when absolutes work. Some non-scientific types like to challenge the notion that there is anything such as an absolute fact or that there is no such thing as right or wrong.
My usual response when challenged to prove something as fact is gravity. I can demonstrate it going and coming, and there is no ordinary way to come to any other conclusion. While it's a black and white issue for most of us, I've actually had some products of the public education system want to argue about it. Limbaugh has the solution for this situation too, let them talk -- as long as they want to. Makes for a good laugh.
Anyway, the problem with the demo is that while most of us owners have seen that articulation, it's a bit confusing for the non-owners 'cuz the TV can't make gyrations like that. I suggest it would be easier to visualize from the TV point of view - if you could get it..
Regards
Ed
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bettered
UpCountry SC
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tluxon wrote:On their marketing video they have a couple segments going through a slalom setup with a camera looking closely at the hitch. I'll record a clip and post it tonight if someone hasn't already.
Tim
I saw the video (a year or more ago), but had forgotten that part.
Ed
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bettered
UpCountry SC
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Here's the 'astounding' testimonial direct from the Hensley web site that I referred to earlier...
"This letter is a little late coming but we feel we need to let you know how much we appreciate the Hensley Arrow Hitch. When we first saw the film on this hitch, neither of us would believe what we saw. After all, anything can be done with film-video to show what you want. We did go to see the Hitch and a demonstration of how it worked and would not have believed it if not seeing it with our own eyes. After being on an interstate with heavy 18-wheel traffic and no problems or swaying plus the other demonstration that was given us, we were sold on it. We purchased our hitch and pull a 30 ft Terry with a suburban (94). We have had no problems and the hitch certainly does all that has been shown about it.
"Then in July of 1997 we were involved in an accident after being hit by another car that had been hit by a drunk driver. The second car that was hit was thrown into a spin, hitting us. At the time my husband was driving on the freeway at approximately 55 miles an hour. The car was in a spin hitting our trailer on the rear wheel, knocking the trailer up and the car going under a partial part of the rear of the trailer. My husband was able to control the rig and drive smooth: although shaken up, to the side of the freeway and bring us to a safe stop. We believe that the Hensley and its capabilities certainly prevented a different out-come. Even our three young grandchildren were only slightly scared after the incident. The police officer also noted our Hensley and stated that he would have been working a much more serious accident had we not been pulling with this hitch, He was familiar with the hitch as his friend has one.
"I also feel very comfortable driving our rig and now share the "road-time" with my husband. We thoroughly enjoy the traveling and seeing new places and meeting new people. We have lots of questions about the hitch and my husband likes to give out any information in regards to it. We both believe that it prevented a much different outcome after our accident and will never pull with out the Hensley Arrow. Thank you for such a great product!!"
"Sincerely,
"Mr. & Mrs. Glen Shelinbarger"
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Ron Gratz
full time RVer
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Joined: 12/27/2003
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[quote=Stressor]Can you tell me how this explanation differs in any way from this one?
[quote=Stressor][img]http://home.ripway.com/2005-1/238631/Folder%20Name/Hensley.JPG[/img]
[img]http://home.ripway.com/2005-1/238631/Folder%20Name/Hensley2.JPG[/img]
[img]http://home.ripway.com/2005-1/238631/Folder%20Name/Hensley3.JPG[/img]
Just curious. :B[/quote]
Milt,
You stated, "At any point along the lines A-C and A-B a set of points could be added as shown by D and E. These could be made flexible and become pivot points."
In my explanation, the extended links are A-C and B-E. There are no intermediate pivot points at D and E. The system A-C-B-A forms a rigid triangle -- the "A-frame" as I referred to it.
In your system, D-C-E-D forms a rigid triangle, but the 4-bar linkage A-D-E-B-A still allows A-B to translate and rotate relative to D-E.
In your second diagram, point C is the Virtual Pivot Point if the lines A-D-C and B-E-C are straight.
In your third diagram, point C is not the VPP. The VPP lies at the intersection of one straight line projected through A and D and another straight line projected through B and E. In your diagram, the VPP would lie to the left and rear of point C.
The location of the HA's VPP changes as the angle between TT and TV (same as the angle between D-E and A-B) changes. That's what makes the Hensley Arrow different from the PullRite. When the HA and PR are aligned straight ahead, the only significant difference in how they handle lateral loads from the TT is in how close their respective virtual or actual pivot point is to the TV's rear axle.
Ron
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