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Topic: Theory for Cracked Panels.
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26/1/2012 at 7:19pm
Location: Somerset Outfit: Bailey Wyoming Kia Sedona
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Following on from a recent thread I've been giving this some thought because I'm that sad. I've come across three people in recent months who have suffered with Cracked front and rear panels on their vans. All three people had caravans with extended front and rear panels. By extended, I am referring to the fact that the plastic front and rear panels extended beyond the vertical line of the van and a reasonable distance along the roof.
My theory is this: A box (the caravan) with a flexible base (the chassis) travelling along uneven surface (the road) needs to be flexible in nature.
A relatively straight forwards (older fashioned caravan) four sided, with a generally flexible roof and wet relatively loosely connected joints would probably achieve this quite well.
If you take away the flexible nature of the box by extending any of the side sections of the box (front and rear panels) up and over angle and onto the roof for a reasonable distance, you will undoubtedly reduce the flexibility of the unit. By doing this the joints wont be able to do the flexing anywhere near as much.
What you might see then, is the need of the front and rear panels to flex much more or, to compensate for the lack of flex in the general design of the box.
All three people I've spoken to had vans with such a design, two of the breaks have been close to or on the points where the panels are attached to the side sections. Which could support my theory.
I'm not saying this is the reason for all plastic panel cracks, just that there has to be much more flex in the older fashioned designs and this might be a contributing factor to cracks in some models.
It's a bit like the bridge scenario, if you make it less flexible through materials, joints or shape, it could break trying to flex. Too flexible and the thing can shake apart, the trick is to get it just right.
Have designs, materials or joints become too inflexible?
Tony B
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26/1/2012 at 8:29pm
Location: Lanarkshire Outfit: Compass Lynx 340 2
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Hi Tony B, All caravans will flex to some degree, as the van body is bolted to the chassis in at least 6 places, 4 of them usually at corner steadies, and near the wheels, if the chassis flexes because of the over hang each side of the axel, you will get flexing in the van body at the extreme ends of the body, as well as the roof above the wheels, ( it maybe the cause of vans needing to be re sealed, pulling and compression of all the van joints), I would have thought that older were as susceptible to flexing just the same as the new ones, new ones probably more so if there is a longer distance from the wheel to the ends of van, the bigger the distance the more it will flex, a contributing factor could be, the weight of end kitchens, bath rooms, bed rooms, that maybe another points to consider in your theory.
------------- If everything runs smoothly then I must have done something wrong
If in Doubt Check it Out.
John
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26/1/2012 at 9:06pm
Location: Outfit:
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Someone I know has a late 90s Lunar which has a crack in the front panel. He drilled the end of the crack, to stop it spreading, but still it grew. He took it to a caravan workshop where they told him the front panel had come away from the floor, the resulting loads were too much for the panel to bear & it was cracking under the strain.
I found this out a few months ago & it all made perfect sense then, but I've forgotten the details, except it was apparently a known fault with them.
Possibly something to look out for???
I know what you mean about movement though. I used to be in the building trade, my first job was restoring listed buildings, where I often saw times where people used modern materials, which don't move much at all, on old buildings, which move quite a lot.
All structures like to move. I often think about my little Lunar, with it's highly flexible aluminium side panels & the increasingly brittle, ageing GRP end & roof panels. So far the only water ingress I've found is around the side windows (& a little by the door, where two panels overlap). The ends & roof seem fine (touch wood).
------------- Matt.
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