|
|
03-02-2019, 06:25 PM
|
#1
|
Member
Join Date: Oct 2018
Location: boise, Idaho
Trailer: Lookin'
Posts: 34
|
Aerodynamic drag on the escape trailer?
Does anyone have any data on the drag coefficient of a Escape trailer.
Aerodynamical drag is not always as it appears to the human eye. Some trailer designs are horrible and about as bad as a brick wall (IE: tab/teardrop style trailers). Others are fairly good (IE: Airstream, and one other brand I can't think of that made "bullet" looking trailers.).
Does anyone have any data on the escape?
|
|
|
03-02-2019, 06:34 PM
|
#2
|
Senior Member
Join Date: Oct 2008
Location: North Vancouver, British Columbia
Trailer: 2009 Escape 17B 2020 Toyota Highlander XLE
Posts: 17,136
|
I've never seen aerodynamical drag posted for any brand of trailer, so even if you can find data for Escape, you'd have nothing to compare it to.
__________________
What happens to the hole when the cheese is gone?
- Bertolt Brecht
|
|
|
03-02-2019, 06:46 PM
|
#3
|
Member
Join Date: Oct 2018
Location: boise, Idaho
Trailer: Lookin'
Posts: 34
|
I suppose I can have a friend tow it with his Tesla and look at the energy consumption. It's not weight when it comes to the drivetrain efficiency on electric vehicles. For example, his 4,000# airstream gets better "mileage" than a 1,200# trailer with two dirt bikes and a "ramp". The ramp's the problem.
|
|
|
03-02-2019, 06:48 PM
|
#4
|
Site Team
Join Date: Nov 2008
Location: Portland, Oregon
Trailer: 2014 Escape 5.0 TA
Posts: 11,064
|
Quote:
Originally Posted by pc500
(IE: Airstream, and one other brand I can't think of that made "bullet" looking trailers.).
|
Are you thinking of the Bonair Oxygen?
__________________
Donna D.
Ten Forward
2014 Escape 5.0TA
|
|
|
03-02-2019, 07:04 PM
|
#5
|
Senior Member
Join Date: Sep 2016
Location: Bremerton, Washington
Trailer: 2019 5.0 TA
Posts: 1,141
|
I have never seen actual drag coefficient data, but speaking to others and reading this forum for a couple of years, it appears that the newer escapes with the boxier front ends on the 19' and the 21' have more drag than the first generation models that were rounder.
I agree that drag has a significant impact on milage. I once drove all day westbound across Idaho against a stiff headwind and my normal 14-15 MPG dropped to 11 MPG. This was towing a 19' classic trailer with a Tacoma.
I'm guessing that the 5.0 will have less drag since a good portion of the frontal area is in the slipstream of the tow vehicle. Also the part of the 5.0 above the truck has a nice slope to it. But I don't know that from personal experience.
__________________
- Arnie & Paula & Kizzy the rat terrier
https://www.arniesea.com
- 2019 5.0 TA, 2017 Tundra Platinum.
- Bremerton, WA
|
|
|
03-02-2019, 07:50 PM
|
#6
|
Senior Member
Join Date: Dec 2018
Location: Quimper Peninsula, Washington
Trailer: TBD
Posts: 369
|
Quote:
Originally Posted by pc500
Some trailer designs are horrible and about as bad as a brick wall (IE: tab/teardrop style trailers)...
|
Oh, I don't know. When I towed my teardrop with my Honda Element it had a negligible effect on fuel mileage. The teardrop drafted in the path of the Element which had kind of a barn door aerodynamics.
__________________
Thanks,
~Farther
|
|
|
03-02-2019, 08:06 PM
|
#7
|
Senior Member
Join Date: Aug 2015
Location: Benton County, Iowa
Trailer: 2013 Escape 21 Classic Number 6, pulled by 2018 Toyota Highlander
Posts: 8,271
|
Drag
I don’t know much about measuring wind drag on the Escape but I did have a nice involved conversation with the owner of Tweety Bird once. Tweety bird is a Compact Junior. They are very square. He was towing with a Chrysler product minivan. He said it’s like towing a brick. So he had a bolt on spoiler from a previous tow vehicle that he mounted on the minivan and tilted it till the bugs quit hitting the upper front of the camper. He told me his mileage went up an honest three or four miles to the gallon. From like 11 to 15. I looked into buying a spoiler and mounting it on the Highlander but never did it. I think there’s probably a possibility for a
payback here.
Iowa Dave
__________________
Ain’t no trouble jacking a double Burma Shave
Dave
|
|
|
03-02-2019, 10:00 PM
|
#8
|
Senior Member
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 14,935
|
Quote:
Originally Posted by pc500
I suppose I can have a friend tow it with his Tesla and look at the energy consumption. It's not weight when it comes to the drivetrain efficiency on electric vehicles. For example, his 4,000# airstream gets better "mileage" than a 1,200# trailer with two dirt bikes and a "ramp". The ramp's the problem.
|
Weight matters with an EV, too, but at constant speed weight isn't a big factor. Aero drag is always important, and any vehicle shows that ramps and protruding fenders are much more important than moderate differences in trailer weight.
The energy consumption per distance display on an EV could be handy for this purpose, although you would need drag at multiple speeds and non-towing baselines to get a reasonable idea of aero drag.
|
|
|
03-02-2019, 10:00 PM
|
#9
|
Senior Member
Join Date: Mar 2016
Location: Burlington Twp., New Jersey
Trailer: 2010 Escape 19
Posts: 7,146
|
Quote:
Originally Posted by Donna D.
Are you thinking of the Bonair Oxygen?
|
Or the Bowlus Road Chief?
|
|
|
03-02-2019, 10:39 PM
|
#10
|
Senior Member
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 14,935
|
Quote:
Originally Posted by pc500
Does anyone have any data on the drag coefficient of a Escape trailer.
|
Not me. I agree that aero data on trailers is rare, for multiple reasons: - Trailer manufacturers have nearly zero technical resources, to perform or even understand any kind of testing.
- Trailer manufacturers have little reason to systematically consider drag, since it is not a requirement or a competitive differentiator; for the few buyers who really care, a trailer can be sold as "low drag" completely without objective basis, so there's no reason to test.
- Trailers are only used in combination with a tow vehicle, and the total drag depends significantly on the tow vehicle's shape and size. With no "standard" tow vehicle, there's no reasonable way for the drag of a trailer to be definitively determined.
Quote:
Originally Posted by pc500
Aerodynamical drag is not always as it appears to the human eye. Some trailer designs are horrible and about as bad as a brick wall (IE: tab/teardrop style trailers). Others are fairly good (IE: Airstream, and one other brand I can't think of that made "bullet" looking trailers.).
|
I agree that typical teardrops are horrible (despite the widely-held belief that they are ideal), both in the basic shape and in the tendency to use highly effective side-mounted airbrakes, which also cover the tires. The old "canned ham" shape with external fenders seems to have returned to popularity - it's truly horrible.
I suspect that Airstreams, my old Boler, and the really cool but failed Bonaire Oxygen are all pretty bad, too, because of their rounded tails. The Oxygen is a particularly frustrating example because it is as if someone put some serious effort into producing an excellent front end, then quit working and just popped another copy out of the mould and put it facing the other way on the back end. How often do you see an aircraft with identical nose and tail?
My guess is that the front corners of a conventional Escape (the 5.0TA is quite different) are usefully rounded, but the identical rounded rear corners do substantial harm. Like many trailers and most older motor vehicles, the underbody is a disaster; I don't know how much that matters in the aerodynamic mess behind a tow vehicle.
If anyone really wants to study this, they could do coast-down tests of various trailers behind the same tow vehicle, and maybe the same set again with a different style of tow vehicle for some insight into the effect of the tug. All you need is something to record speed versus time, and a flat place where you can shift to neutral and coast down from a reasonable highway speed to a significantly lower speed. Apparently there's even an SAE standard for coastdown testing: SAE J1263, “Road Load Measurement and Dynamometer Simulation using Coastdown Techniques”. If anyone does this, I'll note that to distinguish aero drag (force varies as square of velocity) from rolling drag (force approximately independent of speed), at least three data points (pairs of speed and elapsed coasting time) are needed so a quadratic fit can be done.
|
|
|
03-02-2019, 11:00 PM
|
#11
|
Senior Member
Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 14,935
|
Quote:
Originally Posted by rubicon327
Or the Bowlus Road Chief?
|
The taper of the tail of this classic design might actually be gradual enough for the design to work. It would be nice if anyone had actually tested it...
|
|
|
03-03-2019, 08:26 AM
|
#12
|
Senior Member
Join Date: Oct 2008
Location: St. Thomas not BVI., Ontario
Trailer: 2014 Escape 5.0TA / 2016 Ram Eco Diesel 4X4
Posts: 8,038
|
Drag Queen?
Hi: pc500... I have no tech numbers but I do know my best mpg's not towing with my Eco diesel ram are 31.5 Canadian. My best towing mpg's in fairly flat Ontario are 26.4 Canadian. Everyone who looks at the 5.0TA seems to think it's aerodynamic!!! Alf
escape artist N.S. of Lake Erie "Searchin' for my lost shaker of salt".
__________________
Quote Bugs Bunny..."Don't take life too seriously, none of us get out of it ALIVE"!!!
'16 Ram Eco D. 4X4 Laramie Longhorn CC & '14 Escape 5.0TA
St.Thomas (Not the Virgin Islands) Ontario
|
|
|
03-03-2019, 10:16 AM
|
#13
|
Senior Member
Join Date: Mar 2018
Location: Tulsa, Oklahoma
Trailer: 2012 E19
Posts: 1,761
|
Rounded rear corners should be better than squared-off rear corners, as on many stickies. The sloping 'teardrop' or 'raindrop' rear just doesn't provide a good useful interior space in the back, so don't hold your breath waiting to see many trailers built like that.
Towing can be such a drag......
|
|
|
03-03-2019, 11:04 AM
|
#14
|
Senior Member
Join Date: Oct 2017
Location: Kelowna, British Columbia
Trailer: 2018 Escape 19
Posts: 2,721
|
Our last trailer, pictured below, is only different in size from our 19 by 1 inch. Using the same truck to pull both, I notice a huge difference in trailer sway when a large oncoming truck passes on a two lane road. The 19 is much less affected by other vehicles passing.
|
|
|
03-03-2019, 12:37 PM
|
#16
|
Senior Member
Join Date: Oct 2013
Location: Nanaimo Vancouver Island, British Columbia
Trailer: 2015 17b "Shelly"
Posts: 461
|
Quote:
Originally Posted by escape artist
my best mpg's not towing with my Eco diesel ram are 31.5 Canadian. My best towing mpg's in fairly flat Ontario are 26.4 Canadian. Alf
escape artist N.S. of Lake Erie "Searchin' for my lost shaker of salt".
|
Excuse me for being picky and correct me if I'm wrong but shouldn't that be Imperial and not Canadian?
__________________
Like a lot of fellows, I have a furniture problem. My chest has fallen into my drawers
"Billy Casper"
|
|
|
03-03-2019, 12:45 PM
|
#17
|
Senior Member
Join Date: Oct 2008
Location: North Vancouver, British Columbia
Trailer: 2009 Escape 17B 2020 Toyota Highlander XLE
Posts: 17,136
|
Quote:
Originally Posted by sunrisetrucker
Excuse me for being picky and correct me if I'm wrong but shouldn't that be Imperial and not Canadian?
|
Perhaps, but perhaps it should be Confusion instead, since nobody sells fuel in Imperial or "Canadian".
As in, "I get 21.3 miles per Confusion gallon".
__________________
What happens to the hole when the cheese is gone?
- Bertolt Brecht
|
|
|
03-03-2019, 12:49 PM
|
#18
|
Senior Member
Join Date: Aug 2015
Location: Benton County, Iowa
Trailer: 2013 Escape 21 Classic Number 6, pulled by 2018 Toyota Highlander
Posts: 8,271
|
Twin TA’s
She came down from Ontario,
She’s the Niagara Cannonball.
__________________
Ain’t no trouble jacking a double Burma Shave
Dave
|
|
|
03-03-2019, 12:59 PM
|
#19
|
Senior Member
Join Date: Jun 2010
Location: Central, Pennsylvania
Trailer: Escape#5 2022 E19
Posts: 26,268
|
Eggscape,
Too bad Thule stopped making those nice tables, I had one one my T@da and would like to get another one for the Escape.
__________________
Jim
Sometime life gets in the way of living.......
|
|
|
03-03-2019, 01:03 PM
|
#20
|
Senior Member
Join Date: Oct 2017
Location: Kelowna, British Columbia
Trailer: 2018 Escape 19
Posts: 2,721
|
Quote:
Originally Posted by cpaharley2008
Eggscape,
Too bad Thule stopped making those nice tables, I had one one my T@da and would like to get another one for the Escape.
|
Yup...used it all the time to cooking.
Of course we took it off while driving to reduce the drag...
|
|
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|