h a l f b a k e r ycarpe demi
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"I wouldn't be using any more gas than I already use getting to work each day." |
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Ah, but you see, you would use more fuel. |
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It would make more sense if you had a turbine on your beanie. |
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Partially baked anyhow. Energy conservationalists have been playing with wind-generators and solar powered cells on cars for a while now. |
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Hybrid cars with regenerative braking systems. There's something that works. All that energy going up in heat at the stop light. |
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Simple thermo equation: learn it. Energy in - losses = energy out. Therefore energy in > energy out. Always and without exception. It makes the world go round. |
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dag, the more times you convert energy sources, the more you end up losing. Also, I doubt that you'd win any gains; thousands of small powerplants are always less efficient than a few large ones. |
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I don't think most of you thought this out. It would not take more fuel to push a car through a static medium if the turbines only took up the frontal area of the automobile that was already resisting the air flow. YES, if you stick your hand out of the window your will put more drag on the vehicle, but, if you put a fan in the radiator duct, it should not. |
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Got you there.
<Sits back, arms folded, waits for someone to propose putting the fan behind the car to use wind energy that would just be wasted anyway>. |
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Dag, driving down the road today, I saw more suv's than hybrids. What Country can we get mor oil from I wonder. |
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<politically incorrect>to paraphrase a friend's e-mail signature: Arguing on the internet is like running in the special olympics...even if you win, you're still retarded.</politically incorrect>
Ok, now that that's out of the way, any process designed to extract energy must have a source of energy to extract from. Even if the turbine takes up only the frontal area of the car, you'll be disturbing the airflow, and making it more difficult to push the car through the air. I've seen wind-tunnel proof of this: an aircraft with a stopped propeller (just stopped, not even feathered) will have much less drag than an aircraft with a windmilling propeller. (see link)
So yes, putting a turbine on the front of your car WILL increase drag. |
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Instead of just quoting scripture, I will test this out. stay tuned. (politically incorrect. whats that?) |
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Well just tested my theory. I ran around a high school track with a brick in my hand. Timed it, and wrote down how tired I was. Then did the same with a pinwheel attached to a generator. (same size and weight as the brick. Time was the same and I was just as tired as the original run. (and juiced up a aaa battery a little bit.) See testing out a theory is better than just repeating something someone else wrote in a book that cost way too much money at the local college because they changed one word in it. thank you, thank you. |
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Can't argue with that.
In fact, I make it a point never to argue with people who run around tracks carrying bricks and generators with pinwheels. |
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Perhaps you need to repeat your physics class: wind generators pushed by a car will add more need for the power of forward movement than they will generate. Now, put them on your car, but folded down to travel, then park in a windy area and tilt them up - that may work! |
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The moment I saw this, I thought what you said [cowtown]. |
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You can't get energy for free, that's just how it works! The drag induced by the extra workload of the turbines would far outweigh any gains you would have from the system while the vehicle was moving. Whilst parked, you could use pop-up turbines to either charge a second battery, or run an air-con/heating system for the car to give a comfortable temperature when returning. Apparently there was a model of the Mazda 626 (back in the 80s/90s) with solar panels on the roof that would ventilate the car when parked in the sun! |
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Having said that - some vans have small savonius type turbines on their roofs to run auxiliaries like load bay ventilation or chilling, the idea being that they will continue to function even when the vehicle is parked. |
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As for your 'running round the track' experiment - I think you'll find that a) you should be trying running either with or without the pinwheel and the b) the amount of useful energy stored in the rechargable AAA battery was negligible! |
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Useful work = force x distance |
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if force = Fresist + Fgenerate, then you're having to put in Fgenerate x distance extra to what you were doing before, and you're only going to get 75% of that back later uf you're lucky. |
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A fan would have a similar effect, as it has to reduce the pressure of the air in order to extract energy from it, meaning that you're pushing the whole system through a greater pressure difference than before! |
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[marked-for-deletion] science-deficient |
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