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Old 07-16-2010, 04:07 PM   #2 (permalink)
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You're definitely working on the correct end of the Jeep.
It's hard to tell what the curvature is without a side photo.The Aerodynamic Streamlining Template can help you with that.
I hope you are using schedule-40 PVC,as it will be strongest,and that the weight is actually supported by the cargo carrier.
I would recommend as much triangulation as you can get for rigidity.You may be relying on the 4-mil skin for carrying quite a bit of the load.
If the plastic pipe fractures and fails,it may occur elsewhere rapidly,accelerating into a complete collapse.
Work your speed up in increments and mentally rehearse for what you might do should you experience a failure.
And use a lot of attachment points,spreading stresses over many locations.
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