# Forums

## Show-off slideshow for smartphones and iPad

While preparing a talk on "The Recent Resurgence of the Electric Car," I realized that my slides could be kept in an iPad or smartphone for those occasions when someone asks, "But where's the motor?" and you explain that they will have to crawl under the car to see it.

The emphasis is on the great simplification of car design that Tesla has achieved by re-thinking the functional architecture.

Makes a good lunchroom presentation, so I have put together 55 slides in a 4mb PDF file. It's up on Skydrive: download from here and then save it locally. I'll keep updating it as I gain experience (please suggest changes), so download a fresh copy occasionally.

--
William H. Calvin
WilliamCalvin.org

sq1mike | June 23, 2013

Great presentation. Thanks for posting!

wheatcraft | June 23, 2013

Great presentation!

shs | June 23, 2013

Great Presentation. I downloaded it and will use it. The one thing that surprised me is that the presentation suggests that driving 70 reduces the range to 180 miles. On longer trips we typically try and drive to the rated range, i.e. keep the 30 mile average projected range equal to or above the rated range. Our experience is that we can drive 70 on the freeway and more or less make that goal. Our experience would suggest that at 70 MPH we get at least 250 if not 260 miles of range. The range vs speed chart that Tesla published earlier suggests similar range numbers at 70. Could your 180-mile range be for the roadster?

Brian H | June 23, 2013

Check slide 30; it doesn't make sense. Slide 31 is accurate for 220V.

wcalvin | June 23, 2013

I am just using numbers from the Tesla online chargetime calculator, as shown in the screen clip. None of it represents my own experience.

Apropos 50 vs 70 mph, you'd expect such a difference simply from the physics. Air resistance here is mostly about imparting 50 (or 70) mph to the air molecules that the car hits. Fifty squared is 2500; 70^2 = 4900, or about twice the kinetic energy, which must come from twice the propulsion energy, I.e., fuel.

As true for ICE as for EVs.

wcalvin | June 23, 2013

Oops, not literally twice the kinetic energy, just that part of the air resistance which increments as you go from 50 to 70 mph. The total load on the propulsion also includes rolling resistance etc. I won't even attempt to explain the peak and low end of the range vs speed plot. Anyone know a good aerodynamic summary?

wcalvin | June 23, 2013

shs is correct (Thanks!), that was indeed the Roadster range/speed curve. I've fixed it, so download again from the link in the topic abstract and go to the last slide.

Bottom line: Speeding up from 60 to 75 mph loses you 65 miles of range, from 285 to 220 miles.

shs | June 23, 2013

Much better. Thanks.

wcalvin | June 24, 2013

Easier to remember URL is WilliamCalvin.org/EV

2-Star | June 24, 2013

Oops, it's now 54 pages.

wcalvin | June 24, 2013

Eliminated several slides. Here is the speed-range curve:

wcalvin | June 24, 2013

Alas, while there is "img" in the permitted HTML, it doesn't work, so here is the image link: http://sdrv.ms/15zjrzh.

The easier-to-recall bottom line: The slope of the line is "Lose 45 miles range for every added 10mph speed" when averaged over a "full tank" at constant speed on a flat road.

wcalvin | June 24, 2013

Trying from my own server:

Brian H | June 24, 2013

Let me try:

Brian H | June 24, 2013

Nope. One more time:

Brian H | June 24, 2013

wcalvin;
same as yours, but I included width="600" to match the column width.

Brian H | June 24, 2013

Shows max range at 450 mi at 22 mph, about twice as far in 7X the time as as 220 mi at 75 mph. 20 hrs of driving! ;)

jonesxander | June 24, 2013

OH NO YOU USED COMIC SANS MS!!!!! AHHHHHHHHH!!!!

Brian H | June 24, 2013

The original font of humorous horror ... :p!!

wcalvin | June 28, 2013

Much updated slideshow now, focusing on what's has been successfully left out.

The slideshow is at .

wcalvin | June 28, 2013

Seems to leave out
http://WilliamCalvin.com/EV/

GLO | June 28, 2013

@wcalvin May I share this with our local EV group in Sacramento? We have a Linked In site also. I don't want to assume that sharing is ok so thought I'd ask! I like it! I'll give you credit obviously... :)

Shesmyne2 | June 28, 2013

Excellent presentation. Thanks for all the work. Well done

Still Grinning;-)

kevinf311 | June 28, 2013

Nice slideshow. Just one note:

Slide 25: This stripped-down model still shows must of the moving parts. --> This stripped-down model still shows most of the moving parts.

AmpedRealtor | June 28, 2013

You guys could use a graphic designer… :)

Brian H | June 28, 2013

Nice.
But "fix climate" is not a) a problem b) possible or meaningful c) related in any way to CO2.

wcalvin | June 29, 2013

Please make use of the slideshow PDF as you like. Email if you would like the .pptx original (easier to delete and add your own).

I am willing to present to groups in driving distance of Seattle, both on EV and climate topics. There are a lot of good videos (see especially the ones from the National Academy of Science on YouTube) that address issues that the usual suspects have been using to confuse the public and legislators regarding present-day and projected climate change.

wcalvin | June 29, 2013

Slide 25 fixed per kevin's excellent rewording: "This stripped-down model still shows most of the moving parts."