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Thanks for info aerohead. My RV, and especially Randy's RV, I think will benefit from aerodynamic studies on semis, since the 'taller than wider' shapes are similar. My RV is also 8 feet wide, so the ideal length for a boat tail 'template' design would be about 14.5 feet long, according to the width X 1.8 equation. Looking at the curve of the template, I'm surprised it's not longer than that. I think for practicality's sake, though, this one will have to be 6 to 8 feet long.
The info from the link to the NASA/Dryden project that wyatt posted in his email above, notes that leaving off the last four feet or so of the pointed tail in their van project only resulted in a net gain of 0.004 drag, so I'm hoping the shorter length won't be too detrimental.
Doing a full belly pan on my RV is going to be a pain in the neck, but if the truncated boat tail yields sufficient gains I'm game.
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