Quote:
Originally Posted by laack
thanks for the replys. post #85 in the referenced link is the closest drawing to what I had in mind with some slight variations to accomidate larger items that I haul around.
at what point does additional weight to framing the cap offset the fuel savings. my drive to work is 80/20 highway/city. recreational drives hauling items (mountian bikes and road bikes) are almost all highway.
structure materials- coroplast for the skin. skeleton - ?? wood= higher weight, pvc= flimsy, other plumbing piping= unknown strength vs weight ratio.
what materials have been tested on here that produced positive outcomes. I want to consider safety of other drivers vs maximizing fuel efficiency/testing.
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I expect that cap would weigh under 100 pounds. The foam skin and paint are almost negligible. The wood framing is probably less than 10. Hardware may be another 10 (C clamps, metal hinges & latches, gas struts, plexi windows & rubber seals). Fiberglass could add 50 (depending on #plys).