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## Urban Kinetic/Electric Vehicle

Hello Everybody,

I have plenty of ideas popping up, but as usually, the everyday work doesn’t give me any time to develop or even construct and test my ideas, so I came here to share it with you all.

Today I am going to talk about an Urban Kinetic/Electric Vehicle concept.
As we are all aware (or at least many people here at TED), the energy consumption must be lowered, to ensure a better future for all the people on earth.

Therefore I have upgraded the common Electric car with a kinetic energy storage system, or simply said, with a big flywheel.

The point of this idea is, to be able to use low cost gel batteries and mount them into a rotating array, and therefore use their WEIGHT not only for electric, but also for kinetic energy storage!
This would create a big and heavy flywheel, that would be mounted behind the front seats of the car, above the rear drive axle.

And this is how it should work:
1. When you start your daily commute, the flywheel is stationary and all the stored electric energy is used to get the car into travel speed of lets say 50 km/h.
2. When you are approaching the first red light in the city, then instead of heating up the brakes, you decrease your speed and transform it into the rotation of the flywheel and so you store the most of the previously used electric energy into kinetic energy.
3. When the green light lights up, you push your “gas” pedal and the kinetic energy of the rotating flywheel is automatically transferred onto the drive axle, and the car will start accelerating with very little
stored electric energy used.

I think, that this concept has a potential, to dramatically increase the “in city” travel energy consumption.

Can somebody do the math and the physics to check if my assumptions are correct?

I have the knowledge to design and maybe also build a prototype, at least a small one for concept proof, but I would like to see some calculations first and hear some good opinions.

Kristijan Nikl

• #### Kristijan Nikl

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Apr 4 2011: Only 3 days left till the end of this conversation, so i am just lifting it up a little bit, to get some attention, before it expires.

Is it worth further development and research?

Thank you and best regards
• #### Wayne Busby

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Mar 18 2011: I think it is a great idea. Outside my expertise however so all I can offer is encouragement. Keep it going.
• #### Kristijan Nikl

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Mar 20 2011: Thanks for the encouragement. Very appreatiated. =)
• #### Petr Frish

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Mar 8 2011: "to use low cost gel batteries and mount them into a rotating array, and therefore use their WEIGHT not only for electric, but also for kinetic energy storage!"

That is a cute idea. The weight is an important parameter fro a car, and so use the necessary mass twice may indeed have potential.
• #### Kristijan Nikl

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Mar 9 2011: Yes, that is the key point of this idea.

Now, from a technological view, there are some details remaining, but i have almost all of them figured out.

The question is, if we put together a 120V electrical system, how much weight that would be in the flywheel and how much kinetic energy can we store with that.
Also another problem might occur in the batteries. What would be the long-term effect on the gel batteries, when they are being turned around?
• #### Kristijan Nikl

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Mar 8 2011: Correction:

I think, that this concept has a potential, to dramatically DECREASE the “in city” travel energy consumption.