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 Post subject: AERO for the Trailer
PostPosted: Tue Mar 19, 2019 11:56 am 
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Joined: Wed Aug 21, 2002 9:37 pm
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Location: MILWAUKEE
I have seen what appears to be reversed NACA ducts at the back end of an enclosed trailer. What if any benefit is there to these? Would vortex generators be as effective.
The long winter gets my mind wandering. :ask: 8)

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 Post subject: Re: AERO for the Trailer
PostPosted: Tue Mar 19, 2019 3:08 pm 
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Joined: Mon Aug 13, 2018 3:51 pm
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Are you talking about "Airtabs" ?
airtab.com

john f


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 Post subject: Re: AERO for the Trailer
PostPosted: Tue Mar 19, 2019 3:31 pm 
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Location: Belmont, CA
They ARE vortex generators. I installed them last year, and I can't really tell any great increase in mileage, the stability going down the freeway, when you're passing trucks, they are worth their weight in gold.

It also might have been the load leveling hitch, with anti-sway bar, since I installed them around the same time.

The kit was far cheaper than the air dome that you attach to the front of the trailer. That might be worth 1-2 mpg but those around ~$500 and the air tabs were ~$220 for a kit of 80

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 Post subject: Re: AERO for the Trailer
PostPosted: Wed Mar 20, 2019 5:27 pm 
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Location: Northeast PA
racer_tim wrote:
They ARE vortex generators. I installed them last year, and I can't really tell any great increase in mileage, the stability going down the freeway, when you're passing trucks, they are worth their weight in gold.

It also might have been the load leveling hitch, with anti-sway bar, since I installed them around the same time.

The kit was far cheaper than the air dome that you attach to the front of the trailer. That might be worth 1-2 mpg but those around ~$500 and the air tabs were ~$220 for a kit of 80


Tim,
Did you install those on top and sides?
You might be the first person who has ever posted first hand intel on them that I have seen.
I have long thought about them but always wondered if they were worth it.
jimmy

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 Post subject: Re: AERO for the Trailer
PostPosted: Wed Mar 20, 2019 7:49 pm 
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Joined: Mon Nov 02, 2009 3:47 pm
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Location: The Mountains of Colorado
I flat bottomed my 28' trailer. Made a difference and picked up a MPG. Used 1/4' coroplast and pop riveted it on.

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 Post subject: Re: AERO for the Trailer
PostPosted: Thu Mar 21, 2019 2:17 am 
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Didn’t that make it harder for the people following you to pass? If they stayed behind you, didn’t it wear out their tires faster?? :D :lol:

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 Post subject: Re: AERO for the Trailer
PostPosted: Tue Mar 26, 2019 8:47 am 
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Location: Spring Hill, FL.
Vortex gens work if placed in the correct area. They work best in a pressure zone. The best placement will be determined by tuft testing the vehicle, taking pictures of the yarn flow and placing the VG in the areas that still have attached flow .
The VGs placed on the rear window edge will have affects on the wallet only.
The best price for a VG kits is at Lowes. It comes in kit form called "corner guard." 3/4 in lexan.

https://www.youtube.com/watch?v=kATqgss3lNg&t=939s
Here is a crappy vid of my p lane with VG. They helped the low speed control quite a bit .

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 Post subject: Re: AERO for the Trailer
PostPosted: Tue Mar 26, 2019 4:32 pm 
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Location: Belmont, CA
[/quote]

Tim,
Did you install those on top and sides?
You might be the first person who has ever posted first hand intel on them that I have seen.
I have long thought about them but always wondered if they were worth it.
jimmy[/quote]

Yes, along the entire rear and the top. I watched their videos and followed their instructions.

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 Post subject: Re: AERO for the Trailer
PostPosted: Wed Mar 27, 2019 7:55 am 
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Joined: Thu Oct 29, 2009 8:31 pm
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Location: West Chester Pa
Really.......a thread about trailer Aero......Really

But I read it and looked at the links

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 Post subject: Re: AERO for the Trailer
PostPosted: Wed Mar 27, 2019 10:53 am 
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Posts: 822
IMHO as an ME-

In terms of drag reduction on a trailer -no

Vortex generators generally work by creating a turbulent flow adjacent to the downstream surface. For some reason, this helps the fluid flow stay "attached" downstream of that point in a situation where the flow may want to separate / peel away. For instance, they can be found at the fat part of an airfoil to help prevent a stall, or toward the front of a tailfin for similar reasons. They are sometimes on cars at the back of a roofline to help flow stay attached along a hatch.

Given the blunt shape of a typical enclosed car trailer I don't see any "diverging flow" areas where vortex generators would help flow stay attached. If there were a tapered tailcone (or a set of tapering flaps as sometimes seen on semi trailers) then vortex generators ahead of the taper might help the flow stay attached.

WRT stability in crosswinds -maybe

That's more complicated, I have no real idea whether or not they could help!


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