Problem set you need to consider:

1. Turbine engines do not "idle".. what you would equate to "idle" would be
70% RPM. Below that, the burner flame front and balance of air flow through
the engine becomes unstable. Operational power for small turbines comes on
in the 100,000 RPM range which translates to about 90% power setting.
Efficiency drops dramatically at "idle", fuel nozzle coking increases,
emissions increase, etc.

2. Because of the heat stress and RPM centrifugal stress generated with
each start and shutdown, the cycle life of a turbine engine is limited.
Repeatedly starting then shutting down the turbine subtracts a life cycle
with each start against the service limit of the engine.

Add all that into the design plan which you just laid out. The laws of
physics are not easily bent..

On Fri, Sep 11, 2015 at 10:41 PM, archer75--- via Mercedes <> wrote:

> On Fri, 11 Sep 2015 19:38:48 -0700
> Jim Cathey via Mercedes <> wrote:
> > > What kind of turbine would one use?
> >
> > One that doesn't exist yet!
> >
> > > Any idea where to buy one?
> >
> > In the future, I hope.
> >
> > > Turbine engine may make sense on paper, but in reality, there is no
> > > cheap
> > > turbine engine.
> >
> > They're not cheap, so we don't sell a lot of them.  We don't sell
> > a lot of them, so there's no incentive to do the development to
> > make them cheap.  Circular problem.
> >
> > I still maintain that, if the materials and manufacturing received
> > even a fraction of the effort that has gone into Otto engines, small
> > (20HP or so) turbines would be highly attractive.  And _very_ well
> > suited for series hybrid applications.  (Not 'automotive' applications.
> > That term has too many implicit assumptions.)
> >
> > > How would one gear it down to useful RPM?
> >
> > By running at high RPM's, and taking the output as 3-phase electricity
> > not shaft horsepower, the thing would be relatively cheap and quite
> > efficient.  Yes, there would be some significant development costs.
> > But it would be small, efficient, hot, quiet, and reliable.  Not overly
> > cheap, but those other factors would make up for it.  And it (with
> > its battery pack and charge controller) would make a heck of a
> > jellybean component that would have many other uses, such
> > as a genny for an RV, emergency power, etc.
> >
> > If it existed, we would sell millions of the things.
> >
> > -- Jim
> _________________________________________________
> You're sitting in a rush hour traffic jam.
> The turbine is running at max and the current is going into the battery(s).
> The batteries fill up and the turbine shuts down.
> The traffic inches forward a few car lengths and the batteries drive the
> car forward to keep up with traffic.
> The traffic starts moving at normal speed and the batteries propel the car
> until exhausted. Then the turbine spools up, drives the car, and charges
> the batteries.
> You would probably need more battery capacity so the turbine would spool
> up and down less often than a typical hybrid cars engine.
> Based on how the Prius operates, it would very likely work, and with a few
> tweaks of a leased Prius control system (which is currently leased by Ford,
> GM, and several foreign manufacturers) the cost could be kept low for all
> but the turbine.
> Gerry
> _______________________________________
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