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Old 12-16-2014, 03:47 AM   #11
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I think Myth busters did a show on this ?
send a email mythbusters@m5industries.com

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Old 12-16-2014, 07:58 AM   #12
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I've seen these out there and seems like a much less intrusive system that aparently works. Looks much better than hanging that big boxy trailer tail off the back of the unit.



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Old 12-16-2014, 10:57 AM   #13
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Air wings.. yes they work HOWEVER if you leave them up when not towing they cost you mpg's. Airtabs.. if those really worked you would see a lot more of them on semi's. Enclosed underbelly yes it does work a little.. it smooth's out the air flow under the rig, now how much it really helps is another question...
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Old 12-16-2014, 02:22 PM   #14
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I think the #1 factor is frontal area. Wind resistance increases with the square of the speed so anything you can do to reduce area and speed will decrease resistance. A flat front is has greater resistance than one with an angle to it because the air passes around rather than being pushed.
If you watch auto racing, you will often see cars drafting one another. The pair can go faster than either could go by themselves. It follows then that anything you can do to make the wind see one longer continuous vehicle rather than separate truck and trailer will be better.

If you tow your trailer 1000 miles a year, a 1% increase if fuel efficiency might save you $3 or $4. To commercial trucker driving several hundred thousand miles a year even a 1% increase if fuel efficiency is worth having.

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Old 12-16-2014, 02:36 PM   #15
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Originally Posted by TeamFoxy View Post
If you tow your trailer 1000 miles a year, a 1% increase if fuel efficiency might save you $3 or $4. To commercial trucker driving several hundred thousand miles a year even a 1% increase if fuel efficiency is worth having.
My thoughts exactly!

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Old 12-17-2014, 10:36 PM   #16
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MONTHS ago on another site I stumbled upon a similar topic. Someone there had run computer simulations using a very sophisticated software program to model the air flow and determine the drag etc. The software showed animations of the path of the air and relative air velocities.

They modeled various sizes, angles, and fore and aft positions of flat 'wings' (no 'V' shape wings) to deflect the air up and over a trailer being towed by either a van or a pickup truck with a camper shell. As I recall, they had around 4 to 6 different simulations over a period of several days.

Every time a simulation was posted, there would be requests that said, "Thank you for that, but next time could you try ..." because someone wanted a configuration tested that would be more like the one they had or the one they were thinking about buying. One poster said he KNEW his wing it helped his MPG because he had fewer bugs to clean off his trailer...

Anyway, my take away viewing the simulations... IT DEPENDS. There are so many variables involved that a design that worked very well at 45mph might be little help at 65mph, what might work well on a calm day, might not help in a cross wind, what might help with a very boxy trailer might not help a trailer with a rounded nose, etc., etc., etc.

I have no idea of the software used or the processing power required to run it. The poster abruptly stopped posting the simulations. My guess was that his employer found out about it.

I looked for the bookmark to the link, but couldn't find it. Sorry. I've had some computer problems and recently changed PCs.
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Old 12-18-2014, 08:36 AM   #17
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It is a personal opinion IMHO! Lol. To me, the few cents saved is not worth the hassle of putting something like that on my vehicle. To the commercial hauler, his opinion is going to be totally different. Each to their own.

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Old 12-20-2014, 05:07 AM   #18
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I'm toying with an idea. I bought 12' aluminum boat to take camping with me. The plan was to put it in the back of my pickup. I'm thinking of a way to have it to use the bow to "split" the wind before it hits the front of the trailer. To cold out to do much messing with it now though
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Old 12-20-2014, 07:52 AM   #19
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A while back, I ran into a couple with the shorter version of the 23B. We started talking about his cedar strip canoe on his truck (with topper), he said when he has the canoe on top it increases his fuel mileage by 2 to 3 mpgs.

As for the OP the enclosed under carriage will allow the air to slip right by without becoming more turbulent from hitting hoses and cross members. Result a slightly improved fuel economy.

I think about modeling a cab wing, but to much to do and not enough time. Key would be the angle and distance from the tt, you would want a shallow angle (under 45 degrees). I think of it like a motorcycle jump, if it is to steep the front suspension compresses on impact and you loose you speed and momentum.

The general equation for the distance*R*traveled by a bike launched from a height*h*with speed*v*at an angle*θ*is*R=(vcosθ/g)[vsinθ+√(v2sin2θ+2gh)] whereg=32 ft/s2*is the acceleration due to gravity,*h*is measured in ft, and*v*is measured in ft/s. You would probably prefer to have speed in mph, so making the conversion I find an equation you can use which is*R=(0.0672vĚcosθ)[vĚsinθ+√(v2sin2θ+29.76h)] with*v*in mph. For example, if*θ=300,*v=20 mph, and*h=10 ft, then*R=35 ft. www.askphysicist.com. The basic formula could be tweaked to determine optimal angle and distance from tt to make the wing work as designed.
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Old 12-21-2014, 06:26 PM   #20
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My towing mileage went from an average of 8.5 to a little over 10 mpg when I added a cap to the back of my truck. I think cap causes less air to hit the front of the trailer.
I tow at 65 mph or less.

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