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Old 05-24-2011, 06:30 AM   #15
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Ah thanks, Zedex, the diagram helps a lot. So basically the swing arm things are acting as a truss across the hinge between the trailer hitch and the ball.

It's still not totally clear how this works vertically, but it's getting a lot clearer.

And I don't mind a little bull slinging, either. But be careful what you start. I'm ex TYRA and know a dogging heel from an RCA crown.
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Old 05-24-2011, 06:30 AM   #16
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Question Tow, carry

Quote:
Originally Posted by ROBERTSUNRUS View Post
Hi, I will say yes and no. On your receiver, there are usually two sets of weights for trailer towing and tongue weight; The higher of the two is for, when using, a WD hitch.
Oh Robert.... nit,nit,nit.

Now you've really cornfused the Loan Star.

We're now saying you can tow more weight with the WD, but not "carry" more.
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Old 05-24-2011, 06:33 AM   #17
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Loan Star? ha ha. And thank you. We all know that there are basically two types of people in the world. Native Texans, and people who secretly wish they were native Texans.
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Old 05-24-2011, 06:36 AM   #18
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Loan Star? ha ha. And thank you. We all know that there are basically two types of people in the world. Native Texans, and people who secretly wish they were native Texans.
Austin...the best music city in the Country.
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Old 05-24-2011, 06:48 AM   #19
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I went to UT, lived in Austin from 69-71, then back in 77 for some more. now, I detour through there at every opportunity to check up with old friends from the 60's and 70's. I well remember Armadillo World Headquarters, Oat Willies, Zilker Park, Greasy Wheel, Threadgills....

I hear I had a real good time. Reports are still filtering in.
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Old 05-24-2011, 07:19 AM   #20
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I well remember Armadillo World Headquarters, Oat Willies, Zilker Park, Greasy Wheel, Threadgills....

I hear I had a real good time. Reports are still filtering in.
One Tequila, Two Tequila, Three Tequila....Floor. BTDT

I love The Lone Star!!
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Old 05-26-2011, 05:58 PM   #21
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Thanks Zedex I get it now, I was having the same trouble understanding how the weight dist hitch worked. Thanks a million

Dan
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Old 05-26-2011, 11:10 PM   #22
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So I have a hitch receiver rated for 800 lbs, and a trailer tongue weight of 800 lbs. Now if I add the 200 lb weight distribution hitch, have I exceeded the rating of the hitch receiver?

To put it another way, does the weight of the weight distribution hitch add to the trailer tongue weight?

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Old 05-27-2011, 06:26 AM   #23
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Not necessarily.... IF, the WD bars are tensioned properly.

The weight of our HAHA adds about 125# to the unhitched weight of the tongue.

The WD bars distribute a portion of the hitched tongue weight forward to the TV str axle and back to the trailer axles. The remainder on the receiver.

A trip to the CAT scales will better illustrate this.
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Old 05-27-2011, 06:30 AM   #24
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Did Monty Python invent these things?
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Old 05-27-2011, 06:31 AM   #25
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Not necessarily.... IF, the WD bars are tensioned properly.

The weight of our HAHA adds about 125# to the unhitched weight of the tongue.

The WD bars distribute a portion of the hitched tongue weight forward to the TV str axle and back to the trailer axles. The remainder on the receiver.

A trip to the CAT scales will better illustrate this. http://www.airforums.com/forums/f238...-in-17984.html
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Old 05-27-2011, 06:48 AM   #26
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Quote:
Originally Posted by zedex View Post
Here's some professional artwork to convey forces acting on the tow vehicle when using an equalizer hitch. Point A is attached to the top of the eq hitch. Point B is attached to bottom of eq hitch. When you pull up on C which is the draw bar, the forces act on A pushing the top of EQ hitch forwards and pulls B backwards thus pushing the front of the tow vehicle down. Its all about leverage.Hope this helps a bit.


Not to be picky, but in your diagram, shouldn't what you call the "draw bar" be called the "equalizing bar" or "weight distribution bar?"

To me, the "draw bar" would be what goes into your hitch receiver.


Not trying to be a smart ass, just trying to help!


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Old 05-27-2011, 07:24 AM   #27
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I'm still having a bit of trouble visualizing what's going on here. With only one attachment point to the tow vehicle ( the ball and socket) and that point being fully articulated and allowed to swivel, what is making the "force" in the diagram jump over the rear of the tow vehicle wheels? All the weight at the tow vehicle appears to still be pushing down on the hitch area arond that ball. All of the weight still looks to be leveraging the rear of the tow truck frame downward, with the rear axle being the fulcrum...
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Old 05-27-2011, 07:47 AM   #28
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Point is, there is more than one attachment to the tow vehicle. The items labelled "draw bar" in Zedex's drawing (there are two of them, one on each side of the hitch ball ... some are called trunnions, to confuse things a bit more) are made of spring steel and are attached to the hitch via couplings. So when you "lift up" on the rear of these bars - in the direction of the red arrows - it transfers the force of that lift directly to the tow vehicle frame, thus raising the rear of the tow vehicle and lowering the front of the tow vehicle. And then the rearward most part of these lever arms is attached to the trailer frame near point C. Once that is done, there is a downward force at the rear of the trailer.

It's really quite a clever design, especially one items such as "cams" are added in order to add a "straighteneing moment" that works to keep the tow vehicle and trailer in a straight line.
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