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Old 01-28-2015, 08:20 PM   #1
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Twisted PP Stinger

We bought a Propride a year ago for our 25' 1970 Airstream and have put about 3,000 miles on it. The stinger is slightly twisted to the right along the axis of that portion of it that inserts into the TV receiver. We noticed this after a 2,000 trip. I put the TV on a lift and the hitch looks fine. I emailed Sean who said that a twisted stinger is not normal, that I should be able to use it, but should "watch it." He asked if the head moved side-to-side by hand if if we ran our chains through the bars. Yes to both. Our TV is a 2014 ML350 and we don't over torque the jacks because the front wheel wells are 1/2" higher with the jacks raised than without the TT hitched up. Has anyone else experienced a twisted stinger or know what causes it?
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Old 01-28-2015, 09:08 PM   #2
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Can you post a photo?


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Old 01-28-2015, 10:34 PM   #3
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Twisted? Did the 'yoke' move?
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Old 01-29-2015, 05:42 AM   #4
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One of our customers had this occur. There were two theories about what happened. First, that the safety chains were run over the bars, instead of between them, and the second was the driver jacknifed the trailer while backing.
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Old 01-29-2015, 05:53 AM   #5
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Question

"watch it"?.....yeah, I think thats a good idea,

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Old 01-29-2015, 06:19 AM   #6
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Do you leave it in the receiver while unhitched? Somebody hit it in a parking lot? Any witness marks pointing to a hit?
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Old 01-29-2015, 08:16 AM   #7
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Originally Posted by overlander63 View Post
One of our customers had this occur. There were two theories about what happened. First, that the safety chains were run over the bars, instead of between them, and the second was the driver jacknifed the trailer while backing.
Neither happened to us. Most of the paint has flaked off that portion of the stinger that is twisted. I wonder if that hints at the cause.
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Old 01-29-2015, 08:19 AM   #8
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Can you post a photo?


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I don't think it would show much. I haven't measured it, but the twist is probably less than 10 degrees
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Old 01-29-2015, 08:22 AM   #9
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Do you leave it in the receiver while unhitched? Somebody hit it in a parking lot? Any witness marks pointing to a hit?
Good thought. We did leave it in the receiver while unhitched, but no witness marks.
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Old 01-29-2015, 08:22 AM   #10
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A picture of the hitch bar would really help in trying to determine a cause for the twisted hitch bar. This is important information as many Airforums Members are using the ProPride Hitch System.

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Old 01-30-2015, 08:33 AM   #11
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A picture of the hitch bar would really help in trying to determine a cause for the twisted hitch bar. This is important information as many Airforums Members are using the ProPride Hitch System.

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I'll post a picture over the weekend.
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Old 01-30-2015, 05:11 PM   #12
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Gee, interesting. A twisted 2" mild steel hitch bar. I wonder how much torque it would take to permanently deflect a 2" steel bar.

The Propride hitch rides under the ball coupler. It's a socket joint so we can traverse up inclines to buy fuel without putting stress on the A frame or tow vehicle receiver. I don't know what angle the rotation stops when the hitch hits the coupler, maybe 30 degrees? The hitch bar is pulled tight into the hitch with the over center clamps. it is constrained by the 2" receiver and hitch coupler. It seems it would be very difficult to apply much twist to the hitch bar when connected.

You engineers out there calculate the twisting force to permanently deform a 2" solid bar that's say 1 foot between the applied force and the attachment point. I know I don't have a wrench in my garage long enough to do it!

Tintini, put a level or some other straight edge on your stringer and take the photo. Then we can compare the angle of the straight edge to your rear bumper. That might magnify the twist you see.

It's a mystery to me. Finding the cause will be interesting.

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Old 01-30-2015, 05:27 PM   #13
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Twisted PP Stinger

Quote:
Originally Posted by Tintini View Post
...snip...
He asked if the head moved side-to-side by hand if if we ran our chains through the bars. Yes to both.
...snip...

Yes to running the chains through the bars? That would be problematic and possibly the cause of the twist of the stinger. Let's make sure we're talking about the same thing. Please see my picture below. This is how the safety chains should be connected to your TV - they are NOT running through the bars. Did you run your chains a little backward first and then THROUGH the bars or did you run them under the bars as in the photo?


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Old 01-30-2015, 05:57 PM   #14
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Quote:
Originally Posted by Tintini View Post
We bought a Propride a year ago for our 25' 1970 Airstream and have put about 3,000 miles on it. The stinger is slightly twisted to the right along the axis of that portion of it that inserts into the TV receiver.---
Is your stinger bent to the TV's right like the one shown in the photo below --
or is it twisted about its longitudinal axis as a drive shaft might be if too much torque was applied?

The thread in which this photo was posted is: http://www.airforums.com/forums/f464...ml#post1377674

Ron


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