Hi Robert and All,
There certainly can be nice aero trailers that
take little power to tow. In bad aero EVs like the Leaf, they can even clean
up it's aero enough to barely effect range.
But the examples are not it. Their aero isn't
good as the movable roof version has bad aero sides, flat and all the things
sticking out on them, and the roof while started out good, got too steep and
the angle causing the air to break away into diverging vortexes, creating drag.
They have the right idea on weight, honeycomb
panels but fail in execution with so many parts, labor makes a weak, heavier,
costly structure.
To be really aero the front needs a clean 1' or
more radius to the sides, top. Then a gentle widening curve to the widest,
highest points and then a gentle inward curve to the rear and cut off cleanly.
From in front of the widest point to the rear
there can't be anything but smooth surface so your windows, doors, etc in the
front and back though non opening side windows of sheets of plastic without
breaks works.
Done in composites in 3 pieces epoxied
together, top, floor and rear make a strong, light structural box at a fraction
of the labor, material costs of your example.
A nice 12' and 16' design can even have a
shower, nice for 2 to live in while pulled by an EV without losing much range.
I'm planning on building a cargo and maybe
camper version of this shape this yr just for EVs as I haven't seen any others
available but must be out there as not rocket science to show how to do EV
trailers.
Jerry Dycus
--------------------------------------------
On Wed, 2/15/17, Robert Bruninga via EV <[email protected]> wrote:
Subject: [EVDL] EV Travel Tailer?
To: "Electric Vehicle Discussion List" <[email protected]>
Date: Wednesday, February 15, 2017, 6:49 PM
I know an EV is not designed to pull
a travel trailer.
But this very expensive tear-drop design claims 25% the
towing drag of a
conventional tailer.
http://www.safaricondo.com/pdf/alto_en.pdf
Someday, there will be an EV good for this.
Someday, when I retire, I can see traveling from
park-to-park towing such
an efficient trailer behind an EV:
Not trying to go 75MPH, but maybe 60 MPH to enjoy the trip
Not trying to do 500 miles a day, but more like 200 miles a
day max.
We can dream can't we?
I've pulled my boat and Communications trailers behind my
2004 Prius
easily (but not more than local half hour trips...) but they
say you can't
do that... but you can if you use common sense and don't try
to hit top
speed! And keep your eye and ear on how the car is
handling it...
Bob
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