My version of front spat...

[deejaaa]

wheel spats have been on my list for a long time. know the wheel sticking out is hurting mileage because when i take a curve in the road, UG drops inst mpg.
here is what i came up with. no testing yet and sorry if pics are bad, only have the phone.
i have some HD coroplast, the kind used in temp road signs so used it.
1 mark HD coroplast using template

2 cut using favorite tool, this is mine

3 remove inner section, outer will be flap to adhere

4 mark relief cuts

[deejaaa]

5 mark relief cuts

6 use heat gun to contour flaps

7 use heat gun on inner, bend to contour shape

8 contoured one side only

9 white silicone applied

[Joris]

Not sure if the drop in mileage in a curve is hurt only by the wheel sticking out of the fender. That would be a small portion of it, I think most of it is caused by increased roling resistance.

[deejaaa]

10 hold with tape. silicone will not cure under tape until at least 24 hrs

11 lower needs attention

12 start to measure by using piece of split coro

13 after enclosing entire section, adhere with tape to cover whole area

14 fill edge openings with silicone

15 edges filled, final shape using favorite tool

[deejaaa]

16 inner gaps closed with silicone

17 bumper gap needs attention. side profile. next is either fill with body putty and cast mold for fiberglass or cover in Plasti-Dip

[deejaaa]

Originally Posted by Joris

Not sure if the drop in mileage in a curve is hurt only by the wheel sticking out of the fender. That would be a small portion of it, I think most of it is caused by increased roling resistance.

true. really hard for me to say but hopefully i can see if there is any diff.
only have one side for now so will start on the other.

[aerohead]

There is a factor called 'curve resistance' which is eliminated in road tests by keeping to a perfectly-straight road course.
Curve resistance occurs when tire scrub keeps a car along the path of the curve,when centripetal force would rather sling it off the road in a straight line.
Highway engineering texts must cover this aspect of automobile behavior in road construction for safety reasons.
I've yet to see a uniform equation for which to accurately calculate it,complicated by so many rubber compounds available in tires.
The radius of the curve,any super-elevation of the roadway,the velocity,mass of the car,tire compound (as mentioned),inflation pressure,actual road surface,detritus on the road surface.etc. must be included in the equation.
At Ontario Motor Speedway,California,Alex Tremulis measured a 15-mpg penalty while driving through the tracks curves at 55-mph aboard the 100-mpg Subaru X-100 Gyronaut.
It is this curve resistance that your Ultra-gage is reacting to,not aerodynamics.
What you're doing may help otherwise though.

[deejaaa]

Originally Posted by aerohead

There is a factor called 'curve resistance' ..........

well thank you. you just confirmed what Joris said.
hopefully i can see a change on the straight roads. will be in it tomorrow and did finish the right side also.
there won't be an A-B-A, just A-B because i won't remove them unless they make it worse or there is no improvement.
if they work, i want to smooth them out to make some molds. never done that and would be a fun and learning project.

[freebeard]

Tangential and Radial Acceleration
Motion in Two Dimensions

It takes a constant input of energy to deviate from the straight line. That energy is transferred to the road through the tires slip angle. The tread is squirming to make up the difference, which increases rolling resistance.

Do you have any way of testing the result? This is opposite to what BMW calls an air curtain.

[deejaaa]

Originally Posted by freebeard

Tangential and Radial Acceleration
Motion in Two Dimensions

It takes a constant input of energy to deviate from the straight line. That energy is transferred to the road through the tires slip angle. The tread is squirming to make up the difference, which increases rolling resistance.

Do you have any way of testing the result? This is opposite to what BMW calls an air curtain.

just my past records and instant mpg using the ultragauge. i have nothing concrete to contribute. i will give an impression after my 1 hour drive in the morning to work. if there is anything to slap me in the face, i will note it.
can you link the BMW info?