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Open Roads Forum  >  Fifth-Wheels

 > RV wind deflectors do they work we will see

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MFL

Midwest

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Posted: 08/03/22 08:29am Link  |  Quote  |  Print  |  Notify Moderator

^^Steve...you are not seriously comparing your old 7.3 diesel with half the HP, and no emissions to your 14 6.7 diesel loaded with emissions, and heavier truck??

I agree, using two identical trucks, that being a little closer to the cab, may make a slight difference, say 0.27 mpg. [emoticon] My figure CB wrong too?

No offence Steve, just made me smile.

Jerry





Michelle.S

Western NY till fall, then Sebring, FL

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Posted: 08/03/22 09:03am Link  |  Quote  |  Print  |  Notify Moderator

My understanding is they can work, BUT you would have to put the whole set-up into a wind tunnel and adjust the Wing to the exact pitch and then it would only be good for that combination. The pitch/angle of the deflector is critical.


2018 Chevy 3500HD High Country Crew Cab DRW, D/A, 2016 Redwood 39MB, Dual AC, Fireplace, Sleep #Bed, Auto Sat Dish, Stack Washer/Dryer, Auto Level Sys, Disk Brakes, Onan Gen, 17.5" "H" tires, MORryde Pin & IS, Comfort Ride, Dual Awnings, Full Body Paint

pianotuna

Regina, SK, Canada

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Posted: 08/03/22 09:22am Link  |  Quote  |  Print  |  Notify Moderator

I do have a deflector on the front of the hood on my class c. It does help keep insects off of the windshield. They mainly hit the cab over.

btw it is air TABS not tags.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Cummins12V98

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Posted: 08/03/22 09:38am Link  |  Quote  |  Print  |  Notify Moderator

"btw it is air TABS not tags."

Thanks!


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C Schomer

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Posted: 08/03/22 02:15pm Link  |  Quote  |  Print  |  Notify Moderator

A friend had a deflector on his 93 Dodge ctd pulling a 9600lb high profile 5er. It got him 1 mpg when towing and he lost 1.25 mpg unloaded if he didn’t put it down. I would also like to have 4.10s instead of 3.73s. How’s Tonopah? I retired from PVNGS. I don’t miss it, one bit!

cj99

Tonopah,AZ

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Posted: 08/03/22 05:32pm Link  |  Quote  |  Print  |  Notify Moderator

C Schomer wrote:

A friend had a deflector on his 93 Dodge ctd pulling a 9600lb high profile 5er. It got him 1 mpg when towing and he lost 1.25 mpg unloaded if he didn’t put it down. I would also like to have 4.10s instead of 3.73s. How’s Tonopah? I retired from PVNGS. I don’t miss it, one bit!

Tonopah is hot. Lol , funny I self retired 10 years ago from pvngs (paloverde ) I'm now at TMI 1 doing decommissioning work lol
We stay in Colorado in the summers now and sold our Tonopah house





StirCrazy

Kamloops, BC, Canada

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Posted: 08/04/22 06:41am Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

^^Steve...you are not seriously comparing your old 7.3 diesel with half the HP, and no emissions to your 14 6.7 diesel loaded with emissions, and heavier truck??

I agree, using two identical trucks, that being a little closer to the cab, may make a slight difference, say 0.27 mpg. [emoticon] My figure CB wrong too?

No offence Steve, just made me smile.

Jerry


actualy my old 7.3 had 130 more ftlb of torque and 45 hp more than my 14 f350 , but hey its the only thing I had to compare. one thing I did notice is the older truck took a lot more gas peddel to get up to highway speed but once there it towed like a champ, the newer one out towed the hopped up 7.3 all around especialy in the midrange, but the 7.3 would leave musel cars sitting at the lights wondering what just happened.

the point was that with both truck I also towed a 30 foot trailer and the fuel milage was pretty much the same when towing that and worse than towing a 40 foot 5th wheel. the only thing that changes in both cases is the length of space between the back window of the truck and the front of the unit being towed. the larger this area is the more it allows for a low pressure zone to be formed there inducing drag.

so both my trucks got with in 0.2mpg of each other towing the noral camping trailer, but when I went to the 5th wheel the older truck got 1 mpg better than the new truck with the 5th wheel and almost 2.3 mpg better than when it towed the trailer. the older truck the nose of the 5th wheel was about 1.5 feet off the back window, the new truck it is almost 3.5 to 4 feet off the back window. take it for what its worth but it makes sence. if you add air tabs (yes there ugly, but I wonder if you color matched them how they would look) it disrupts the aire coming over the back of the unit to prevent that low pressure zone from being formed which results in less drag. but to get the maximum benifit you would have to put them at the back of your 5th wheel and on the back of your cab, just to much ugly for most. the deflectors were showen not to be worth the cost on highway tractors, instead things likt the airtabs , flow below, and a few others are actualy worth your money but the biggest gas saving they found was from reducing the space between the back of the cab and the trailer and disrupting the low pressure zone at the back of the trailer.


2014 F350 6.7 Platinum
2016 Cougar 330RBK
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cj99

Tonopah,AZ

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Posted: 08/06/22 05:40pm Link  |  Quote  |  Print  |  Notify Moderator

OK well its installed , here are pictures of it folded up & folded down see shared folder linked :[image]

link here

fj12ryder

Platte City, MO

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Posted: 08/06/22 06:24pm Link  |  Quote  |  Print  |  Notify Moderator

It would be interesting to see a side view with the trailer attached, to kind of give an idea of distance from the deflector to the nose of the trailer, and the height comparison.


Howard and Peggy

"Don't Panic"

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