Quote:
Originally Posted by aerohead
Currently, from Jeff Howell et al., at Loughborough University in England, your drag reduction will be the area of the new wake, compared to that of the OEM wake, as a percentage, multiplied by the OEM Cd. And that presumes fully-attached flow rearwards along the tapering panels.
From the photographs it's impossible to 'measure' the before and after dimensions, so no prediction is possible.
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From studies I’ve read, the wake size will be smaller than just the measured “ edges” of the cavity fins if I taper them in because then that wake extends inwards with a different vortex layer. It forms an “ invisible boat tail” that the outside air flow skims across. Not to mentioned the rear base pressure increases too from the cavity affect. I’ll be tuft testing them and then heat molding the taper inwards while maintaining attached airflow.
Was thinking of doing the same thing under the car with a diffuser, pretty much just acting as a horizontal box cavity fin. It should also help with snow and rain build up on the back of the car and keep the backup camera cleaner too I believe