Re: Halloween Message: Ignore all messages launched by a troll ...

[Chris Foster]

"Ken C. M." <[email protected]> wrote in
news:[email protected]:

> Tim Downie wrote:
>> Jeff Grippe wrote:
>>> Has anyone ever hear of a bike/trike/quad setup where the vehicle is
>>> powered by batteries and the pedaling is strictly used to charge the
>>> batteries. This type of setup would/could allow someone to choose
>>> the level of resistance that they desire for cycling and still have
>>> a vehicle that moves. I don't think that this would qualify as an
>>> HPV since it would really be an electric vehicle with the option of
>>> using a human to charge it.
>>
>> Driving a generator to charge a battery to drive a motor is going to
>> be *way* more inefficient that a simple chain drive and derailleur.
>> Who wants to pedal harder than they have to already to make progress?
>>
>> Tim
>>
>>
>
> It seems to me that the vehicle would weight so much and would take so
> much electricity to drive it that you would have to a very high gear
> ratio in order to spin the generator fast enough to charge the
> batteries to drive the vehicle that you would be much better off just
> buying a nice lightweight bicycle.
>
> Ken


Add Solar Cell's and this is viable, not a HPV, but good cheap
transportation

Chris Foster

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[Chris Foster]

"Daryl Hunt" <[email protected]> wrote in
news:[email protected]:

>
> "Werehatrack" <[email protected]> wrote in message
> news:[email protected]...
>> On Thu, 2 Nov 2006 07:11:21 -0500, "Jeff Grippe" <[email protected]>
>> wrote:
>>
>>>Has anyone ever hear of a bike/trike/quad setup where the vehicle is
>>>powered
>>>by batteries and the pedaling is strictly used to charge the
>>>batteries. This
>>>type of setup would/could allow someone to choose the level of
>>>resistance that they desire for cycling and still have a vehicle that
>>>moves. I don't think that this would qualify as an HPV since it would
>>>really be an electric
>>>vehicle with the option of using a human to charge it.
>>>
>>>Has anyone ever heard of such a thing?
>>
>> Any competent engineer would look at the significant power losses in
>> the two points of energy conversion of crank->generation and
>> generation->storage, and immediately conclude that this was a really,
>> really intensely bad idea by comparison to direct coupling of the
>> crank to the wheel via a chain.
>>
>> Yes, I am dead certain that what you propose has been tried, since
>> examples of battery-powered bicycles and examples of human-powered
>> generation systems are trivially easy to find as far back as the
>> first decade of the 20th century. The fact that no such lash-up as
>> you propose is actually produced for sale, when there has been a
>> hundred years' worth of experimentation involved, should be a big
>> clue.
>
> Contact Union Pacific. They use that but they have 5000 hp diesels
> running alternators without no battery assist. What's a little
> ineffiency between friends on this one.
>
>
>>
>> Do not let my observations dissuade you from spending your own money
>> in an attempt to make it work, however. Some of us value the
>> entertainment factor in watching such endeavors as they are pursued
>> to their conclusion. I would, however, counsel against seeking
>> venture capital for the project; some investors have a tendency to
>> become a bit testy when their money proves ill-spent.
>
> You should see my latest creation. I made an Electric Chopper Bike
> with about a 15 mile range. It doesn't even look like a bicycle at
> all but under all that trim is still a pedal bike.
>
>
>


MG set (motor - generator sets) are at best 70% efficient. The rest of
theenergy goes into heat. Batteries are 40 - 70% efficient (getting
better and better all the time)





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