Great article. But I still hold that I am skeptical to see what actual results will be seen in MPG with these.
From what I understood, these airtabs should speed up the airflow and smooth it to lower the CD. So would these work on any part of the vehicle that doesn't flow as well as it could such as the wheels, or even on the back of a hatchback civic? I would assume it would given the principle of how they work, but I would guess there would also need to be flow testing done to prove there effectiveness (and to make sure they don't do more harm than good) to be sure of it.
On the never-ending quest for better gas mileage...
on my truck. I imagine it has a greater impact on the shape of a truck / van than it would on an already much more aero car.
First - the scale pics, as requested:
Then - pics of them installed on the F150 (I may take the time to paint them red later - but most likely not.)
Finally the stats on the test route...that being a 45/55 mph bypass stretch with stoplights out, a 65 mph interstate out, 65 mph interstate back, and 45/55 mph bypass back.
Before (all current mods except Airtabs), according to SGII
23.6 / 22.6 / 20.6 / 23.7
After airtabs installed, according to SGII
25.7 / 24.3 / 22.0 / 25.6
Appears to be a solid 2 mpg gain (7-9% increase).... It was also pretty cool to "see" them working. I drove under a falling leaf. It would normally have hit my windshield and bounced over. Today, I saw it falling and then get rushed up over the windshield without ever hitting it, so it would appear that the tabs on the hood are indeed directing airflow over the windshield to some extent. Granted, this was one lousy leaf... it will be interesting to see if this trend continues (lots of falling leaves this time of year), and if I have the same experience noted by the other guy - a cleaner windshield...
I think that would be difficult to do for three reasons...
1st - the tabs are stuck on pretty good, I "could' get them off, but I'd be afraid of them not reattaching as well once they were pried off. This would disappoint me greatly and cost me more money (in the way of new adhesive of some sort).
2nd - I dunno how to do a string test, but Im sure someone could describe the proper method. I would be willing to do it if Im able on the existing setup. Perhaps windtunnel test results could be found on google somewhere for a stock F150 (I can try to find that). If not, here is a stock dodge that provides some evidence of a before - albeit not my exact truck.
3rd - I dont own a camera, and would need to get someone to assist me that does. I assume that the filming also needs to be done by a chase car? So I just need to find the right assistant (someone with a camera who is willing to help me out)
Let me know how to do the testing, and if this would provide any value to folks, and Ill see about pursuing it.