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Re: Gas turbine/electric hybrid?
If you want to look at economical hybrids, look to a diesel-electric
combination like locomotives use. In a vehicle hybrid of this sort the
electric motors would always be the prime movers and the diesel would use an
auto-throttle and auto-switch to either send the electricty directly to the
motors or into storage batteries. You accelerator pedal would regulate the
juice going to the electric motors only and not the RPM of the charging
diesel. Since diesels are more efficient at idle than a gasoline motor of
the same size/output, you can use the power in the batteries to do all the
accelerating and stop-and-go driving (keeping the diesel at idle RPM for a
much longer time than using a directly coupled motor) and only have the
diesel increase RPM when you need either the batteries charged or a direct
flow to the electric motors for power. In addition, a hybrid of this type
would not need any significant leaps of technology or waivers for emissions.
Just my two cents worth - Jonathan
"Bret Ludwig" <bretldwig@yahoo.com> wrote in message
news:1137975898.815007.219340@g44g2000cwa.googlegroups.com...
>
> Al Bundy wrote:
>> Nomen Nescio wrote:
>>
>> "Electric motors develop maximum torque at zero rpm......."
>>
>> Is that so?
>
>
> Depends on the type of motor used.
>
> Actually turbine-electric makes some sense: turbines are efficient at
> constant speed and offer both high efficiency and light weight,
> offsetting the heavy batteries. Regeneration is unnecessary in a
> constant--power setup: the turbine expanders can be optimized for that
> regime.
>
> Emissions would be a deal killer because it would take intense and
> long development to get them to recip standards. The best thing that
> could be done for turbine car buffs would be to enact a emissions
> _certificatiion_ waiver for turbine cars for a set time, so as to make
> it worthwhile for some company to build a fair run of them. The waiver
> should be carefully written to force the outright sale, not lease or
> test loan, of the cars so they cannot destroy them like the Chrysler TC
> program or the GM and Ford factory electrics.
>
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