Electric cars-Charge on its own

[jbirdboy]

i'm yet to research this idea....

having said that, if a air damb was made and inside of it was a mini wind mill and the power of which was directed to the alternator that in return charged the batteries that the vehicle runs on...... now i understand that enough energy probably would not be produced to run the vehicle on it's own, but i would like to think that enough would be created to make the batteries charge to stay higher, longer.

 

questions i have...will research on my own....but if you have the answer please share...

 

what is the ratio between the minimum air speed on the blades, the blades surface area and it's out put in torque?

 

what is the ratio between torque and a generators ability to create energy?

 

something to ponder: is the energy out put enough to make up for the drag of the air damb......i'd like to think that the drag wouldn't be much at all(might be misinformed)

 

understand with a smaller blade, the less you'll get from it..if the air damb was the width of the vehicle and sat on the roof-having the fan blades all in a row across the roof....so i'm sure that driving 60+mph (opposed to 15mph for the big wind mills); this i believe would imply that the surface area of fan blades is 1/4 the area of the big fancy ones in the fields around the world....

[Sisyphus]

The energy output is always going to be less than the added drag. Otherwise you've created energy from nothing, which is impossible.

[insane_alien]

what's 'air damb'?

 

also, sticking a windmill on top of your car while your driving will NOT charge up the battery. what will happen is it will cause drag and eat up electricity faster than it makes it so in effect you will be draining the batteries quicker.

 

a retractable windmill that can be deployed when the car is parked however wouldn't be so bad.

[jbirdboy]

i guess i didn't make it very clear......ok i understand that the resistence would drain the battery and the energy created would not be enough to off set the drain in the battery.

 

by air damb i mean the same as a hood scoop...dont know how to explain it much more than that

 

like most 'electic cars' they run on fuel untill a certain point....what if the energy from the blades was only harnessed while fuel was the main contributor to the over all movement of the vehicle.....and when it's being run off the battery, a small sheild would come up infront of the air damb eliminating the air resistence,not slowing it down at all

now if the vehicle was run 10 miles reaching top speeds of 50 using mainly fuel, then merged on to the highway for x amount of miles going 70.... the battery would have been charged enough to sustain 70mph for x miles

 

now the question is, is x miles worth the added resistence while the vehicle is running off of fuel?

 

 

sticking a retractable windmill so when you park the vehicle i find to be comical

 

this has been something i've been pondering for a couple weeks, and i'm not very serous, just thought i would bring it up to make some viewers rethink the already thought of.

 

if it were up to me....the heat from the exhaust would be captured to run a form of boiler....the roof would be solar panels, and the actual aerodynamics of non-commercial vehicles would be regulated and be enforced...

but none of this would matter as long as people still want all those horses under the hood and dont mind paying for it......you can't regulate freedom i guess/or can you?

[Sisyphus]

It doesn't matter whether it's running off batteries or fuel. The charge going to the battery must be less than the extra energy either motor is using to overcome the extra drag. You're better off just charging the battery with the fuel-driven motor directly, which is in fact how it works.

 

Heat of exhaust is indeed waste, as is engine noise and vibration. You could try to harness them, but it would be more efficient to just try to reduce them in the first place.

 

If you really want to see some efficiency optimization, check out this car being developed called the Aptera:

 

http://www.aptera.com