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Old 08-23-2011, 01:35 PM   #1
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Break the suction

Has anyone found a roof mounted air deflector, that can be mounted on the top, rear of a coach that will break the suction created behind your rig, that drags all the dirt and road grim to the rear surface.
I have seen one model coach that had one built into the rear cap. (Don't remember the make) What is needed is one that can be attached to any coach (Class A or C) I would think breaking the suction would also help fuel economy

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Old 08-23-2011, 01:44 PM   #2
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Try theseAerodynamic Fuel Economy Savers for Road Vehicles

1990 28' Georgie Boy, 454, 4bbl, Thorley Headers, Recurved Distributor, 8.75 mpg. RVM 76
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Old 08-23-2011, 05:12 PM   #3
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There is a lot of turbulence over the roof of a motorhome - from the many protrusions up there (a/c, skylights, vent pipes, fridge vent, satellite domes, antennas, etc). I doubt if any kind of roof-mounted device could be effective. Well, unless designed in a wind tunnel for that specific coach roof.

I've seen spoilers for the rear side edges of a motorhome, intended to break the suction behind the rig. Couldn't find them online just now, though.
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Old 08-23-2011, 06:14 PM   #4
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Google "World's Fastest Motor Home"

The motor home is a slightly (MUCH) modified GM, Dang near an antique by defination (How long ago did they stop selling GM coaches?) but it has just the spoiler you are asking about.. The outfit that made it is in the RV customization business and likely can provide one for your ride as well. I don't know how much good it will do at 55mpr, but at 120.. I am sure it helps.
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Old 08-23-2011, 08:56 PM   #5
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what were those lil triangle things you glue to the sides?
All the rage a year or so ago...
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Old 08-23-2011, 09:03 PM   #6
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Originally Posted by JimM68 View Post
what were those lil triangle things you glue to the sides?
All the rage a year or so ago...
Look at post #2 in this thread
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Old 08-25-2011, 09:32 AM   #7
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Has anyone actually used these AirTabs with sucess? I've read their information, but, do they work? The cost is modest if they actually provided better mpg or better handling. MFG always say their product works. I'd prefer to hear from RV'ers that installed them and had good or bad experience. They look kinda ugly to me. If I could gain more milage I'd consider them. so far the only thing that has proved to give me better milage is a lighter foot on the go pedal.
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Old 08-25-2011, 12:45 PM   #8
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I have seen the Air-tabs and I agree "Ugly" describes them. No one has come forward to say if they actually break the suction. I remember station wagons in the 70's had a deflector on the rear roof as an option. I installed one my daughters Subaru Wagon and it kept the rear window clear of road dust
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Old 08-25-2011, 01:44 PM   #9
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The Holiday Rambler Vacationeer about 2000 had the molded endcap air deflector. Only lasted two years talked to the chief engineer at Monaco and he said they quit it because people were stepping on it when they went on the roof and breaking them. this required new end cap and
Monaco decided it wasn't worth it. Their design was to reduce dust/dirt on back of the coach according to the engineer
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Old 08-25-2011, 02:55 PM   #10
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the deflectors on the back of station wagons work to keep dirt off the back window, but at the cost of increased drag. aint no free lunch!
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Old 08-25-2011, 05:10 PM   #11
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The rear of my MH would get dirty with oil spots all over it within 500 miles of being washed.

I had the Ultra Guard installed on the rear. And that fixed the problem.
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Old 08-25-2011, 06:54 PM   #12
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On another forum one member tested them and found a very small gain in fuel mileage on an older Foretravel DP. Something like .1 or .2 MPG overall, but he also reported the rig as more stable when being passed.
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Old 08-25-2011, 07:54 PM   #13
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I have them on my MH and they do keep the rear of the coach and the towed cleaner. As far as improving fuel economy goes if it does help it is not enough to notice. Personally I think they are worth the money just for the cleanliness.
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Old 08-25-2011, 08:11 PM   #14
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Air tabs. We use them on our Semi tractor and trailers. Drivers report that it is like tieing a tail on a kite. Keeps the trailer straight in a crosswind and keeps the back of the trailer cleaner, and helps with visibility behind the trailer in the rain. Fuel mileage is hardly noticeable, but the rest is really worth it. Paint them the same color as the motorhome and few will notice.

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