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Author Topic:   Where to deflect the air
mod4
Dirt Freak

Total posts: 223
posted June 15, 2003 09:24 AM  
Buying a 30' 108" tall trailer used. Going to be pulling it with a 2003 Dodge Dually, provided by a car dealer - which brings me to my Q :
Since the truck can't be fitted with a roof airflow deflector (it gets sold after we put 5,000 "Demonstrator" miles on it) would fitting one to the topper work ?
We get to keep the topper and swap it from truck to truck anyways.
If this would work, is there a formula for figuring out where to mount it as far as distance from the trailer?
I'm talking about the "wing" style deflector, also asking for input if this is my best choice.
Thanks.

mod4
Dirt Freak

Total posts: 223
posted June 17, 2003 02:35 PM  
Okay, I must be bored, I am answering my own Q

I talked to Taylor Wings, who build both excellent SprintCar and Semi/Truck towing wings. The general answer was a wing mounted with the trailing edge flush with the rear of a topper on the bed of a pickup was actually superior to a roof mounted wing as far as air deflection and fuel milage. An angle of approx. 35* to start with is the baseline.
I'll have the topper and wing installed in about 14 days, I will probably play with some fans and smokebombs and report back if I find anything interesting.

thebigdirt
Dirt Full Roller

Total posts: 62
posted June 21, 2003 07:50 PM  
WE BOUGHT AN OLD CAP AND MOUNTED THE AIR DAM ON IT. IT REQUIRED SOME BRACING BUT IT CAN BE PLACED ON YOUR NEW TRUCK.

wizzard
Dirt Freak

Total posts: 306
posted July 07, 2003 08:16 PM  
the only thing i would be concernd about is the down force on the topper.ive driven semis now for 11 years and have seen the talor wing push the top of a sleeper down in the back where it was mounted so brace it up good realy good and it'll probably be ok

mod4
Dirt Freak

Total posts: 223
posted July 15, 2003 02:23 PM  
Mounted the wing on a "Jason" brand topper and ran 2800 miles (Iowa and back). No problems up to 90mph so far.

Rick D
Dirt Full Roller

Total posts: 64
posted July 15, 2003 05:30 PM  
So...are you using a Taylor wing, or the air deflector?


mod4
Dirt Freak

Total posts: 223
posted July 15, 2003 08:19 PM  
Taylor Wing, the "executive" size I think ? it's about 2" wider then the topper on each side. My dually looks fast and furious now !
LOL.
I do lay it as flat as possible when not towing.

wizzard
Dirt Freak

Total posts: 306
posted July 15, 2003 09:15 PM  
keep an eye on it watch for strees cracks and such the tailor is about the best you can get for air deflection

mod4
Dirt Freak

Total posts: 223
posted August 12, 2003 07:42 PM  
Just reporting in.
I now have about 3,000 miles towing the trailer with the wing on the topper, absolutely no problems to report. I set the cruise at 80 and just ride down the Interstate, WFO is about 92mph on level ground.

New '04 Dually will be here in 5 weeks, more ponies and & torque then what I have now, curious to see how different it runs. Also has a 6 Speed instead of the 5 I have now.

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