Quote:
Originally Posted by bluebunny
OK, I did not give much support for the not recommended rooftop spoiler, so here is my reasonable speculation:
1. The trailer gap is very high, which significantly reduces (or eliminates) the benefits of a rooftop spoiler.
2. The temptation is to "go for lunch", etc with the truck while not towing, which can very quickly eat any gains.
3. It is a PITA to mount and unmount, and drags even if folded flat. Normal truck use will eat the life out of the gains while trailering.
4. with research, a proper stab at the canard fronts will outperform the rooftop spoiler.
5. With canards, maximize filling the gap, but watch out for maneuverability, so sides should be smaller than top, but need not be simply contoured.
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Here is an option,which actually made it into production in the UK way back when.
It's an inflatable nose which gives you the great crosswind bulbous advantage,plus killing a major portion of the gap.It's light and isn't in the way until 'under way.'
A 12-VDC blower does the inflation.
