Jayco RV Owners Forum

Thread Tools Display Modes
Old 12-16-2014, 02:47 AM   #11
Senior Member
herewego's Avatar
Join Date: Oct 2014
Location: Alvin
Posts: 708
I think Myth busters did a show on this ?
send a email mythbusters@m5industries.com

2009 Jay Flight G2
2014 RAM 3500 Turbo Diesel
herewego is offline   Reply With Quote
Old 12-16-2014, 06:58 AM   #12
Senior Member
Join Date: Sep 2011
Location: Burson, CA In the foothills of the Sierra Nevada Mts.
Posts: 313
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.



Steve, Berne and Rascal
2012 Jayco 31.5 RLTS
2007 F250 Powerstroke
Panhead is offline   Reply With Quote
Old 12-16-2014, 09:57 AM   #13
Senior Member
Seann45's Avatar
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 8,779
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...
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12

Seann45 is offline   Reply With Quote
Old 12-16-2014, 01:22 PM   #14
Senior Member
Join Date: May 2012
Location: Sebastian FL
Posts: 193
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.

John & Nancy
Jay Feather 25Z 2007
Ford F-150 XLT 5.4 Triton 2008
TeamFoxy is offline   Reply With Quote
Old 12-16-2014, 01:36 PM   #15
Senior Member
Join Date: Sep 2013
Location: South Texas
Posts: 3,631
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!

2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)

Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!
Camper_bob is offline   Reply With Quote
Old 12-17-2014, 09:36 PM   #16
Senior Member
oldmanAZ's Avatar
Join Date: Dec 2014
Location: AZ
Posts: 3,771
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.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.
oldmanAZ is offline   Reply With Quote
Old 12-18-2014, 07:36 AM   #17
Senior Member
Join Date: Jan 2011
Location: Vienna
Posts: 1,454
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.

Joe Hinson
2010 Jayco Quest G2(SOLD)
2014 Jayco Eagle 33.5RETS
2007 Ram 2500 5.9L Cummins(SOLD)
2015 Ram 2500 6.7L Cummins 4WD
namusmc65 is offline   Reply With Quote
Old 12-20-2014, 04:07 AM   #18
Senior Member
Join Date: Oct 2014
Location: oneonta ny
Posts: 525
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
rick danger is offline   Reply With Quote
Old 12-20-2014, 06:52 AM   #19
Senior Member
Jagiven's Avatar
Join Date: May 2012
Location: Minnesota
Posts: 3,183
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.
Jagiven is online now   Reply With Quote
Old 12-21-2014, 05:26 PM   #20
Senior Member
Nighthawk 96's Avatar
Join Date: Apr 2011
Location: Columbia SC
Posts: 553
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.

2012 Toyota Tundra 5.7 Litre DoubleCab
6 speed, 4.30 Limited Slip, Tow Package
2013 Jayco White Hawk 27DSRL
2010 Jayco JayFlight 26BH sold
Yamaha EF2000is Generators (2)
1996 Honda CB750 Nighthawk
Nighthawk 96 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia State Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 06:53 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.