Re: [EVDL] Rear Diff IRS | Direct Drive
That’s a joke. FORTRAN is unique AFAIK in that it had no constants. You could assign new values to strings like “42” = 327. This leads to horrifying bugs, as you might imagine. The person writing the documentation probably didn’t approve of this misfeature. -- Doug Weathers http://www.gdunge.com Dedicated to the creation of a spacefaring civilization > On Nov 27, 2019, at 12:21 PM, Gail Lucas via EV wrote: > > David, am I misinterpreting this or did Xerox actually suggest that pi might > change? I still have FORTRAN manuals but none for Xerox specifically. > > Gail > >> On 11/26/2019 6:44 PM, EVDL Administrator via EV wrote: >> "The primary purpose of the DATA statement is to give names to constants. >> Instead of referring to pi as 3.141592653589793 at every appearance, the >> variable PI can be given that value with a DATA statement and used instead >> of the longer form of the constant. This also simplifies modifying the >> program, should the value of pi change." >> -- FORTRAN manual for Xerox Computers > ___ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] EVLN: NASA X-57 Maxwell e-plane w/ 14 e-motors> fly in 2020
(Aero engineer speaking up here) It's the thrust that makes the lift. The function of the wings and the flaps are to take some portion of the air being blown across the wings (either directly by a propellor or jet engine, or indirectly by the forward motion of the airplane), and turn that flow downwards. By Newton's Third Law, there's an equal-and-opposite upward force on the airplane. This is lift. All that stuff about Bernoulli's Principle is just details on how the flow is turned, feel free to forget about it until you need to do calculations for incompressible fluid flow. A side effect of generating lift this way is generating drag. Some of the energy from the engines is now not being used to move the plane forwards, so it counts as a loss for forward motion. That's drag. More lift means more drag. Flaps are used to generate huge amounts of lift at takeoff, with a corresponding huge increase in drag. The engines need to be big enough to supply enough thrust to still allow the airplane to take off. Now about all those electric motors! One benefit is to be able to smoothly vary the airflow across the entire wing as needed. Another benefit is that, generally speaking, a bunch of small electric motors can be cheaper than an equivalently-powerful large electric motor. Finally, having lots of motors gives you redundancy in case of a failure, which is important in an airplane. Extra costs include the complexity of the control system, the more complicated mechanical design of the wing, and weight and cost of extra wiring. When the engineers who did this design studied the tradeoffs, they must have decided that lots of electric motors were a better idea than just one or two. Et voila, you have the X-57. > On Nov 11, 2019, at 7:54 AM, Peri Hartman via EV wrote: > > Interesting thought. Does that actually pan out ? After all, that additional > lift takes energy which I think would result in less forward thrust. Not sure > that's a positive tradeoff. > > Peri > > -- Original Message -- > From: "Paul Wujek via EV" > To: ev@lists.evdl.org > Cc: "Paul Wujek" > Sent: 11-Nov-19 7:24:41 AM > Subject: Re: [EVDL] EVLN: NASA X-57 Maxwell e-plane w/ 14 e-motors> fly in > 2020 > >> >> On 2019-11-11 10:13 a.m., Peri Hartman via EV wrote: >>> Does anyone know why it is better ? >> >> I'm not an engineer, but I think that having accelerated air from the props >> along the whole length of the wing creates additional lift. >> >> With a single prop the air from the prop would only add lift in the area >> near the fuselage. >> ___ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> ARCHIVE: http://www.evdl.org/archive/index.html >> INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) >> > > ___ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > -- Doug Weathers http://www.gdunge.com "There is no easy way from the Earth to the stars." - Seneca "We choose to go to the Moon and do the other things - not because they are easy, but because they are hard." - John F. Kennedy ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] 1971 VW Ghia available/EV4sale: EV project in Midland, TX
Thanks, Bruce. Yup, that's my car.
I was going to post it on the EV Tradin' Post, but hadn't considered putting it
on the EV Album since I never finished it. Good idea, though.
Next it's off to the garage to inventory the parts and take a bunch of pictures.
> On Aug 25, 2018, at 12:51 PM, brucedp5 via EV wrote:
>
> Doug I've had experience selling two EVs.
> Having an evalbum.com page is a free valuable tool for that purpose.
> Please consider creating one (like Alan's
> http://www.evalbum.com/5215
> )
>
> On a search I did not find anything other than
> https://mobile.twitter.com/gdunge/status/628024580762828800
>
> If you want to use its image, download
> https://pbs.twimg.com/media/CLcxB07UsAEvZJz?format=jpg
>
> Once the evalbum listing is created,
> use its URL (web address) in your EV4sale advertising posts/efforts.
>
>
>
>
> For EVLN EV-newswire posts use:
> http://evdl.org/archive/
>
>
> {brucedp.neocities.org}
>
> --
> Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/
> ___
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> http://lists.evdl.org/listinfo.cgi/ev-evdl.org
> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
>
--
Doug Weathers
http://www.gdunge.com
"There is no easy way from the Earth to the stars." - Seneca
"We choose to go to the Moon and do the other things - not because
they are easy, but because they are hard." - John F. Kennedy
___
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Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
[EVDL] Anyone interested in an EV project in Midland, TX?
Hi all, Here's the reason I've rejoined the EV list after my long absence. This is a sad message, but I need to lighten my load of one EV conversion that's been "nearly done" for about 10 years. We're moving to the Seattle area and it's uncertain how much room I'll have to work on it. Plus I promised my wife that our move to Midland was the last one for the Ghia - if it wasn't roadable by the time we left, I would sell it. That time has come. It's a 1971 Karmann Ghia with custom seats and dashboard. It has an 8in Advanced DC motor (the one from the Corbin Sparrow, so it has a longer driveshaft). It's already installed via an Electro Automotive adapter with a taperlock hub. I've driven it up the driveway and into the garage with one battery and some jumper cables. The car was designed with Exide Orbital batteries in mind, which appear to be hard to find in the US now. Not yet installed, but included: - replacement wiring harness from Ron Francis wiring (the hot rod guys) - Zilla 1K - Manzanita Micro PFC20 charger - 18 or so Mk 2 battery regulators, with my custom battery mounting hardware - a PakTrakr (battery instrumentation system) - Zilla cooling kit from Ryan Bohm at EV Source - 1/0 battery cables and battery lugs - various tools, such as an awesome crimper and a big inverter for battery load testing I haven't gone through and made a detailed list or come up with a price for it yet. I thought maybe someone would be interested and make me an offer and save me the work :) Feel free to ask questions or make suggestions. Thanks, Doug W. -- Doug Weathers http://www.gdunge.com "There is no easy way from the Earth to the stars." - Seneca "We choose to go to the Moon and do the other things - not because they are easy, but because they are hard." - John F. Kennedy ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
Re: [EVDL] Mom yanks kids from e-toy-suv w/ smoking pack before it flames
(Hi everyone, I'm back to the EVDL after some years away. More on that later.) That wasn't a Powerwheels, it was something else. The CBS News page that Bruce linked to says it was a "SPORTrax Awesome XL" and it cost $500. Here's an Amazon page, which appears to match the vehicle in the video: http://a.co/7DlP5v5 That leads to the manufacturer, which is Rolling Hills Trading: https://www.rollinghillstrading.com/shop/sportrax-cars Here's an assembly video: https://www.youtube.com/watch?v=YkNQiPTQsFg Note that it has a motor on each wheel and has a wireless remote control that can steer the front wheels electrically. The Amazon page also lists that it includes an MP3 player. Clearly it's got some fancy electronics in there. It's a big RC car. I wasn't able to turn up anything about the batteries besides the info that it contains two 12v batteries. The manufacturer's website no longer has that particular car listed, but it does sell parts, including batteries. They sell a 12v 10Ah battery for $20 and two 12v batteries (Ah not listed) wired in parallel for $30. Not sure if these were what was in this car, and I can't find chemistry information. The article says they were driving up a hill, which the pictures support. That'll heat things up some, which could be an ignition source. That fire doesn't look like anything to do with lead acid batteries. There was some serious fuel burning there, and I agree with Lee - it didn't look like fire-retardant plastic. Could it be lithium? What does 20Ah of lithium look like when it burns? Was the car made out of flammable plastic? Lithium or lead, this is not the sort of thing you'd expect from a properly-designed kid's toy. Did the kids fill it up with gasoline before driving, like their parents always do? > On Aug 17, 2018, at 10:12 AM, Lee Hart via EV wrote: > > paul dove wrote: >> Any electrical system can burn up. All you need it to short the battery if >> there is no fuse or you bypass the fuse then the wire becomes the fuse and >> can easily catch plastic on fire > > I agree... but not like that! Something was fueling that fire. Something not > normally in a Powerwheels Jeep. > > Unless they've changed something very recently, the Powerwheels battery > already contain a fuse. There is nothing under the hood except the battery > itself. The "controller" is just a pair of switches under the central > "gearshift" lever. In back, there is a motor in each rear wheel. That's it. > > The body is plastic with a flame retardant. It can burn, but goes out if > something isn't maintaining the fire. When it burns, it melts into a gooey > mess that smoulders, turns black, bubbles, and releases lots of black smoke. > > Maybe this is some other brand? Or a cheap knock-off? > > -- > "Verschlimmbessern" (German, verb) - To make something worse by > trying to improve it. (English translation: "Microsoft"?) > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > ___ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > -- Doug Weathers http://www.gdunge.com "There is no easy way from the Earth to the stars." - Seneca "We choose to go to the Moon and do the other things - not because they are easy, but because they are hard." - John F. Kennedy ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
