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Sounding a lot more positive,
Boatsapper, yes have been thinking about alternatives to maintain access to rear of vehicle.
Aerohead, that's the sort of numbers I like to hear, that is amazing, if I can get 10-15% fuel economy improvements, I'm sure I would blow the first tanks savings in a drunken stupor.
Drmiller, I have redone the numbers with underside taper at 10 degrees and top and sides at 18 degrees and that rounds of to about a 50% reduction in rear surface area. As Sven7 queried, I also thought the trailing edge should be a sharp cut off, did you mean moreso about following the body lines and curving the side and top panels as they come in?
I'm almost thinking it may be easiest to just get a massive block of styrofoam and shape it appropriately, then put a skin on it. Put some doors on the rear and just have the smaller dimension as the cargo area.
Will go and have another read about the aerocivic and other boattail designs.
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