Quote:
Originally Posted by Frank Lee
A roof top addition such as OP described will present more "frontal" area to an x-wind than it will to a straight-on wind (which is exceedingly rare) because of the length of the roof and his stated intention to run it full length if not moreso.
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Straight-on wind will be just as rare in the UK, yet Don-Bur get good results on their bulged trailers.
Properly executed, the idea certainly has merit.
Invest a bit (frontal area) to gain in Cd, and end up on the positive side.
Make the increase in area too large, and it will wash out the positive effect.