boat tailing behind wheels
 

anyone have an idea of how much of an impact boat tailing behind wheels has?

was thinking of adding some behind the wheels on my ioniq when i do the under tray
was thinking of cutting and rounding these foam wedges behind the wheels. firm enough to hold shape, but soft enough to take impact if something wacky happens
https://m.media-amazon.com/images/I/...AC_SL1500_.jpg

Once they're cut and rounded which way would be up? I could see it with 3" wide tires.

The hive mind says conveyor belting.

what do you mean? id put them behind the tires and gorilla glue the to the under tray. id cut them to be the same width or a little narrower than the tires

Well, not that I care; but the question was would a square, rectangular or triangular face be uppermost?

How wide is the tire?

rear wheel fairings
 

Volkswagen will build its ultra-frugal XL1Find the image of the 2013 Volkswagen XL1, and look at what they did.
Your wheel skirts could be low enough that they integrate right to the leading edges of the fairings.
A look at the book, 'The Leading Edge', by Goro Tamai, of MIT's solar race car team would be a look at the wheel fairing candy store!;)
7th image from top:

The xl1 is where I’m modeling my idea after. They don’t really use them on the rear wheels. Only boat tailing on the front mostly

rear
 

Actually, they do have boat-tails behind the rear tires, as well as the fronts, and in front of the rear tires.
All a good thing!:)

Still not seeing an XL1 fairing with that little material.

not
 

1)They had very little rear overhang to work with, but used all they had within the constraints of the diffuser.
2) And, as per the J-form/K-form testing @ FKFS, Volkswagen shaped what they had exactly as per best practices for a two-dimensional flow section, as observed for lowest drag.
3) If they'd had more aft-body, they could have had more drag reduction.
4) In HVAC practice, one needs ' six pipe-diameters' ( tire width ) distance downstream of an 'obstruction'( tire ) in order for the streamlines to recover.
5) Many solar race cars take full advantage of the car's 'real estate.';)

Sounds excessive, a six inch tire would need a three foot tail. HVAC is an inverse case. Mair found an l/d of 1.0 gets 80% of the maximum.