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Just to add to the crosswinds issue, I was also planning to have curvature from the sides, so there would not be any large flat areas exposed for major crosswinds. From experience weight on the roof is a much bigger issue than crosswinds.
I suppose to put it in context, the vehicle stands about 7ft high x 7ft wide at base and about 5ft wide on the roof, so as a percentage adding say 7" to the roof height is really not very much as a percentage, whether viewed from the front or side.
Only just occured to me, what I'm thinking of is virtually an upturned boat on the roof, just a very shallow one, maybe thats what I should be looking at as a design guide??
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