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Old 08-31-2016, 10:49 AM   #1
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Air deflector on tow vehicle, does it help?

You can get an air deflector for pickups to defect the air over the top of the 5th wheel. Question is has anyone determined if these really help enough to be worth using?
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Old 08-31-2016, 11:57 AM   #2
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I think there was a study years ago , and a lot of the gains were dependent on the front profile of the 5er in question .
Newer 5er with a dome shaped front cap would probably not see any real benefit, where an older unit with square corners and a rippled siding front will see the most.
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Old 08-31-2016, 12:59 PM   #3
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Would not bother with the cost and the set up for each tow. Pain in the butt. Hook up and go!
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Old 08-31-2016, 04:55 PM   #4
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What I read over the years is no MPG change but the bug line would move up or down on the front of the 5ver.

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Old 08-31-2016, 05:53 PM   #5
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Quote:
Originally Posted by Skip426 View Post
I think there was a study years ago , and a lot of the gains were dependent on the front profile of the 5er in question .
Newer 5er with a dome shaped front cap would probably not see any real benefit, where an older unit with square corners and a rippled siding front will see the most.
I can see that being the case. Looking at a Keystone High Country 353RL or a GD321RL-R both of which have airo front caps. I'm also looking at the vortex generators for the rear of the 5er. Even if they don't add much milage they do help keep the crap of the back cap.

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What I read over the years is no MPG change but the bug line would move up or down on the front of the 5ver.

Dave
Ah yes, a bug deflector.
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Old 09-04-2016, 09:37 AM   #6
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My Freightliner is as tall as my Teton. Keeps bugs off mostly. Get a few around the edges only.
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Old 09-08-2016, 05:42 PM   #7
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My buddy just installed one on his TV. No difference in MPG at 75 mph :( but his nose stays clean.
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Old 09-13-2016, 04:49 PM   #8
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In wind tunnel tests a Model A ford was much more aerodynamic going backwards than forwards. The air forms a vacuum behind the trailer which pulls on it acting like a brake. It is why many Semis now have rounded cones on the rear of the trailer as it allows the air to slide off rather than cling to the rear.
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Old 09-13-2016, 06:25 PM   #9
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Quote:
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In wind tunnel tests a Model A ford was much more aerodynamic going backwards than forwards. The air forms a vacuum behind the trailer which pulls on it acting like a brake. It is why many Semis now have rounded cones on the rear of the trailer as it allows the air to slide off rather than cling to the rear.
Which could bring us back to the AirTab debate
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