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I thought that I had built the tail very strongly, however the forces at high speeds are much higher than you might expect.
My theory on why the tail went bang: the sections between the trunk and doors were open and only duct taped to the cars body. When the duct tape loosened up, these sections acted as air scoops. At high speed, the air pressure inside the tail blew out the clips holding the tail to the bottom of the bumper, which then also acted as an air scoop and immediately catastrophic failure resulted, with the tail ripping out from under the trunk and side doors.
This may have been prevented by using fasteners on the bottom of the bumper.
I am not proud to have constructed something that may have been a danger to another driver. I thought it had been correctly built but real world testing proved otherwise.
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