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Old 09-04-2009, 08:40 PM   #1
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Air tabs


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Old 09-05-2009, 05:52 AM   #2
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Hi dajudge,
Last month, I was parked next to a couple that had these on their 40 ft coach. The guy claimed better control. He saw no MPG difference. Neither my wife (the real decision maker) or I like the looks of the Air Tabs. I would not put them on my coach.

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Old 09-06-2009, 03:52 PM   #3
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There is an article in the Sept 09 issue of Family Motor Coaching that shows that there is a slight improvement. They must look horrible on the side of a MH.

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Old 09-06-2009, 05:10 PM   #4
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I think they would make a change.good or bad I can't say.As flat as the sides are it would cause a lot of drag.Any thing stuck out would break up the air.To find out what happens you would need a wind tunnel,and I don't think these were tested this way.I would also be concern about what it did to the air flow to the Radator,very much so if center rear.Also as stated they are UGLY.
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Old 09-06-2009, 05:46 PM   #5
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For any noticeable improvement in mileage usually requires quite a few other "air cleaners" as well , I doubt one by itself would make any difference ..
We have tried quite a few things in the trucking industry along those lines and if you do get a return on the investment , its in tenths ( not many either ) of mpg .. Driving the miles we do , it still takes a while to get your money back , if you do at all ..

A motorhome , with the exception of the underside , is already pretty clean in the air ..

But we're pushing three sheets of plywood into the wind with the front of the coach ..
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Old 09-06-2009, 06:37 PM   #6
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This type of device, Vortex Generator, has been used in the aviation industry for years with excellent results. Sometimes what appears to be a Drag Inducer provides positive results, at least in aviation. When I read the information at their web site I came away with the understanding that it was tested in a wind tunnel. All they showed was a pretty picture, no facts that I recall. The price seemed too steep for me considering the relatively low mileage I put on and the low return on investment. The passing vehicles do not make much impact on my rig. I did find one part interesting in their text explaining how passing traffic interferes with handling. They say the Tabs eliminate the number of pulses, down to just one, but not all pulses. I think the airflow through an aft mounted radiator would be improved according to their description. Sure would like to hear from someone that has used them!
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Old 09-06-2009, 07:39 PM   #7
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A device like this might help a bit on one coach and not at all on another - depends on the air flow characteristics of the particular coach. My American Tradition already has an air dam on the roof which diverts air down over the rear cap, to break up the vacuum that sucks dirt in behind the rig and creates extra drag. Don't know if it helps fuel any, but if definitely keeps the rear cap cleaner than the previous rig.
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Old 09-07-2009, 09:34 AM   #8
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Nobody on the thread so far has tried Air Tabs, but I have them on my MH. I think they look ok or even good. I noticed some handling improvement and I have not tried to determine what MPG there might be. MPG is affected by too many things for a small improvement to be isolated and measured easily. FMCA magazine had an article that stated a 0.5 MPG improvement with Air Tabs. On RV.net some have seen similar improvements. It is too bad that more measurement have not been made, but even those results would vary from Air Tabs on another rig. My handling improvement shows that something is going on with my Air Tabs, so MPG effect might be there too. When fuel becomes more expensive the discussion of Air Tabs will heat up. BTW it is really the design of our rigs that cause the drag. Virtually every design feature of my coach is for the benefit of making it more functional or just reducing its cost. Aerodynamic is an oxymoron for my MH!
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Old 09-07-2009, 09:41 AM   #9
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If you need them to get better control of your MH when an 18 wheeler is passing You.
Then you have more problems to take care of then installing tabs.

The way they are making 18 wheeler tractors today. It is hard to feel anything when they pass. And driving my MH at 55-58 MPH they are a lot of them that pass me.
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Old 09-07-2009, 11:03 AM   #10
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Thumbs down

Air Tabs for an RV can cost $200+- for a possible 4% mpg increase. The computer animated VIDEO mentioned wind tunnel tests were done. Before I open my wallet for Air Tabs, I want to see some videos of wind tunnel tests of RVs with A/C, sat and other roof obstructions with colored smoke. There is no mention of air passing under the trailer or objects on top like A/Cs, sat's, antennas, etc. In regards to handling, I would want to test drive two identical RVs - one with air tabs and one without air tabs. Maybe I am old fashion, but I don't trust computer animation alone.
The air tabs may help keep the back of a rig cleaner but they won't keep the roof or sides cleaner. Think of the fun you would have washing strips of those ugly tabs.
I did not notice, are the white tabs guaranteed not to yellow or would on have to paint them with Krylon FusionŽ?
For their price and cost return, if I put the miles on continually driving cross country as an independent trucker, then may-be I would seriously consider these.
This would be a good product for "Consumers Reports" to test.
Did anyone notice if these were endorsed by Al Gore and the green party
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Old 09-07-2009, 12:56 PM   #11
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I had camping world install on the front axel-- steer safe and I like them
My wife would not drive the interstate befor because of the trucks but now she will. the air tabs you see and this steer safe you do not.
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Old 09-18-2009, 12:57 PM   #12
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I had an Alfa which is white, and the result of the new air tabs was very good. The coach had a problem with passing semi's that was totally deminished with the air tabs. Being white, the were hardly visible. They did not yellow, or attract dirt. The back of the coach remained much cleaner in the rain etc. I did not see any increase in fuel mileage. My current coach does not have a problem with passing semi's. So obviously, it depends on the coach configuration. If you have a problem, they are great, if there is no problem then they are a waste of money IMHO.
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Old 09-18-2009, 07:07 PM   #13
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I also don't like the look of them, but did talk to 2 couples this summer with them on 5er's. They told me that they felt the biggest improvement was that rear of the unit was cleaner. As for handling and mpg, no change that could be confirmed. Seems like a lot of money to keep the dirt of the back of your rig.
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Old 09-19-2009, 07:42 AM   #14
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Dirt on the back of the RV is a sure sign that there is a noticeable low pressure area behind the rig. That means there is drag (actually suction) that you have to overcome and that means more fuel. But how much more? Probably a few tenths of mpg or maybe as much as 0.5. Worth it? You decide.

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