/sci/ - Science & Math

>>1374976

Wireless energy transmission.

>>1374976
>pic somewhat related, it's an affordable 100% electric car with 100 miles range and 90 miles/hour top speed
it's also a car whose production will pollute the earth more than if you'd bought a traditional fuel car instead.

Nice going.

a far more sexy electric car

http://www.teslamotors.com/models/specs

>>1374978
wi tricity ftw

>>1375002
>will pollute the earth

fuck the earth, people live in cities

>>1375020
cities in space

A reasonably efficient gasoline engine can get fifty miles per gallon. Two gallons of gasoline weighs about 12 pounds. The battery pack in the Nissan Leaf weighs 440 pounds. Battery tech needs to get about 30 times lighter.

>>1375032
A Nissan Leaf's battery pack requires 8 hours to charge. It takes a five minute stop at a gas station to put two gallons of gas into your gas tank. Battery recharge tech needs to get about 100 times faster.

>>1375032
> implying that diesel cars aren't more efficient than gasoline powered ones

>>1375056
Buy two batteries and leave one charging.

There have been some promising experiments where adding nanotubes to the anodes of a lithium battery enhanced the storage capacity, it worked by increasing the surface area of the anode in a way that doesn't breakdown rapidly with multiple discharges. Some of the lab experiments show a 10 fold increase in storage density. There's still a ways to go in making it into a manufacturabile product but it looks good.

>>1374976
>90 miles/hour top speed

>>1375032
the electric engine is much smaller and lighter and doesn't have to deal with emissions and oil and whatnot, you moron

>>1375056
http://www.wired.com/autopia/2009/05/better-place/
>The prototype revealed in Japan is the first of what the Silicon Valley startup promises will be countless automated battery exchange stations that will one day dot our cities. The technology will make it possible to travel long distances in an EV without the hassle of stopping to recharge your battery[...]

>>1375062
I've set up my examples for Americans, for whom diesel engines are largely illegal because their emission guidelines are based on percentage of toxic material rather than quantity of toxic material.

>>1375083
yep, most feasible option for the near future

>>1375081
efficiency goes both ways.

>>1375081
Yup. I gave them an 80 pound engine weight difference. 12x30 = 360, 12x36 = 440.

>>1375002
[citation needed]

>>1375108
>80 pound engine weight difference
I'm only guessing but there must be more!

The most efficient car

>>1375115
The little, lightweight engines in efficient modern cars weigh only 200 pounds or so. They aren't the giant, ten cylinder monstrosities of yesteryear.

>>1375032
Electric engines are ridiculously efficient compared to ICE's.

The big showstopper is battery storage. Right now, batteries absolutely SUCK at energy storage especially compared to gasoline.

BUT overall, ICE and Electric vehicles are comparable in performance for their weight. The only significant difference is price, with Electric being a great deal more expensive.

The best way to reduce price is to invent new, higher capacity batteries. Which is what's going on right now.

>>1375121
That's not very efficient at all.

Just because it's human powered doesn't mean it's efficient.

silicon nanowire, 10x more power density than lithium based

>>1375139
>The little, lightweight engines in efficient modern cars weigh only 200 pounds or so
I don't know but you still have to add all the pipes, fuel tank, heavy ass inefficient transmission system etc

>>1375154
They never looked tired in the episodes, they move pretty fucking fast, and the emissions are zero. I'd say that's pretty efficient.

>>1375161
There are a lot of ways to make that lighter. Most people take the heavier alternative because the light versions are more expensive and require more frequent parts replacement... additional expense. There IS NO CHEAP ALTERNATIVE when it comes to electric cars.

>>1374974
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>>1375176
That motor seems like a good idea but it is very unpractical and shit in reality.

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>>1375201
Funny, rotary Wankel engines are fairly common.

http://en.wikipedia.org/wiki/Wankel_engine

>>1374973

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